-
YEAR = 1998
[ID ]:KL98S001
[AUTH]:Sugimoto Koh-ichi, Kanda Mutsuo, Oguchi Masahiro and Inoue Akihisa
[TITL]:Creep Strength of RS/PM Al-Ni-Mm-Zr (Mm:Misch Metal) Alloys
[SOUR]:THERMEC'97: Proc. Int. Conf. Thermomechanical Processing of Steels &
Other Materials, ed. by T. Chandra and T. Sakai, (1997), 979-985
[LAB ]:(2); Shinshu Univ.; Teikoku Piston Ring Co., Ltd.; Inoue
[ABST]:Creep strength and creep deformation mechanism of Al-7Ni-1Mm-1Zr and
Al-7Ni-2Mm-1Zr (Mm; misch metal), at%, alloys hot-extruded from rapidly
solidified (RS) powder were investigated at temperatures ranging from
523 to 673K. The alloys had high 100h creep strength of 85-100MPa at
573K. The stress exponents for power creep law
(varepsilon/D=(sigma/E)]n[) were about n=1 and n=11 in a low stress
range and in a high stress one, respectively. In addition, the apparent
activation energies for creep were about 80 and 220-320 kJ/mole in each
stress range, respectively. In the high stress range, the creep
deformation of the present alloys obeyed to "Substructure Invariant
Creep Law" considering a threshold stress for creep, similar to ODS
alloys. With decreasing creep stress, the creep deformation changed to
"Coble Creep Law".
[TYPE]:Non-Ferrous Metals and Alloys
[PROP]:aluminum alloy, creep strength, rapid solidification, powder
metallurgy, creep deformation
******************************************************************************
[ID ]:KL98S002
[AUTH]:Ohtake Akihiro, Miwa Shiro, Kuo Li Hsin, Kimura Kozo, Yasuda Tetsuji,
Jin Cheng Guo and Yao Takafumi
[TITL]:Surface Processes during Heteroepitaxy of ZnSe on GaAs(111)A as
Observed by Reflection High-Energy Electron Diffraction
[SOUR]:Phys. Rev. B, 56[23] (1997), 14909-14912
[LAB ]:(2); Joint Res. Center for Atom Technol.; Yao
[ABST]:Reflection high-energy electron diffraction and (RHEED) and
x-ray-photoelectron spectroscopy have been used to study dynamical
growth processes of ZnSe on GaAs(111)A-(2times2). ZnSe
heteroepitaxially grows in a biatomic layer-by-layer mode with the
(111)A orientation, being accompanied by distinct RHEED intensity
oscillations. The growth rate of ZnSe increases and decreases with
increasing Se/Zn flux ratio and ZnSe film thickness, respectively. We
have found a strong dependence of the growth rate on chemical
composition of the growing ZnSe surface.
[TYPE]:Semimetals and Semiconductors
[PROP]:ZnSe on GaAs(111)A, RHEED, surface process
******************************************************************************
[ID ]:KL98S003
[AUTH]:Kadowaki Hiroaki, Kohgi Masafumi, Ohoyama Kenji and Kasaya Mitsuo
[TITL]:Neutron Diffraction Study of Antiferromagnetic Order in the Kondo
Compound CePdSn
[SOUR]:J. Phys. Soc. Jpn., 63[6] (1994), 2337-2342
[LAB ]:(2); Inst. for Solid State Phys., The Univ. of Tokyo; Yamayasu
[ABST]:Magnetic structure of the Kondo compound CePdSn is studied by neutron
diffraction experiments on a single-crystalline sample. Below T[N]=7K,
Ce moments establish a single-Q type ordering S[nv]=a[v]e]ik cdot
Rn[+a]*[[v]e]-ik cdot Rn[ with incommensurate modulation vector
k=0.473b]*[. The polarization vectors a[v] cannot uniquely be
determined from scattering intensities, and thus those which reproduce
the intensities are selected using a maximum entropy method. The
polarization vectors have a, b and c components with root mean square
of the moment m[rms]=0.82}0.08mu[B] (m]a[[rms]=0.59, m]b[[rms]=0.48,
m]c[[rms]=0.30mu[B]) at T=1.5 K.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:Kondo compound, magnetic structure, antiferromagnet, neutron
diffraction, CePdSn
******************************************************************************
[ID ]:KL98S004
[AUTH]:Arai Masatoshi, Fujita Masaki, Ubukata Katsunori, Ohta Hitoshi,
Motokawa Mitsuhiro, Otomo Toshiya, Ohoyama Kenji, Mino Michinobu,
Akimitsu Jun and Fujita Osamu
[TITL]:Structural Evolution of Spin-Peierls Material CuGeO[3] Studied by
Neutron Scattering
[SOUR]:J. Magn. Magn. Mater., 140-144 (1995), 1689-1690
[LAB ]:(2); Dept. of Phys., Kobe Univ.; Res. Develop. Corp. of Jpn.; Dept. of
Phys., Okayama Univ.; Yamayasu; Dept. of Phys., Aoyama-Gakuin Univ.
[ABST]:The crystal structure and phonon dynamics of the spin-Peierls material
CuGeO[3] have been studied by neutron scattering. We found a large
lattice anomaly in the a-b plane, perpendicular to the one-dimensional
antiferromagnetic spin chain, above the transition temperature. The
phonon modes at 100meV, of the chain oxygens, show anomalous behavior,
consistent with structural change. We therefore conclude that the
structural evolution of the chain oxygens in the a-b plane, which
mediates the spin-spin interaction along the c-axis, drives the
spin-Peierls transition.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:CuGeO[3], spin-Peierls system, neutron scattering, lattice constant,
one-dimmension
******************************************************************************
[ID ]:KL98S005
[AUTH]:Kohgi Masafumi, Osakabe Toyotaka, Ohoyama Kenji and Suzuki Takashi
[TITL]:Neutron Scattering from Low-Carrier-Density Strongly Correlated
Electron Systems
[SOUR]:Physica B, 213&214 (1995), 110-115
[LAB ]:(2); Dept. of Phys., Tohoku Univ.; Yamayasu; JAERI
[ABST]:The results of neutron-scattering experiments on Ce- and
Yb-monopnictides with very low carrier density are discussed. The
experiments on a single crystal of CeP revealed that the complex phase
diagram under magnetic field comes from the interplay between the
long-period ferromagnetic lattice of the Ce ions with Gamma[8]
character and the antiferromagnetic ordering in the normal Gamma[7] Ce
lattice. The inelastic-scattering experiments on a polycrystalline
sample of YbP show the existence of strong short-range spin correlation
at temperatures far above T[N]. The result indicates that the
Kondo-like properties in Yb-monopnictides seen at low temperatures
originate from anomalous spin correlations. The experimental results
from CeP and YbP are discussed in relation with the magnetic polaron
model.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:CeP, YbP, low carrier, neutron scattering, Kondo effect
******************************************************************************
[ID ]:KL98S006
[AUTH]:Kojima Akira, Makino Akihiro and Inoue Akihisa
[TITL]:Hard Magnetic Properties of Nanocrystalline Fe-Rich Fe-Nb-Nd-B Bulk
Alloys Produced by Consolidating Amorphous Powders
[SOUR]:Nanostruct. Mater., 8[8] (1997), 1015-1024
[LAB ]:(2); Faculty of Eng., Tohoku Univ.; Alps Electric Co. Ltd.; Inoue
[ABST]:Nanocrystalline bulk Fe[88]Nb[2]Nd[5]B[5] and
Fe[76]Co[10]Nb[2]Nd[7]B[5] magnets were made by consolidating amorphous
powders using an electric-pulse-current-sintering method and subsequent
annealing. The bulk alloys made by consolidating amorphous powders have
high densities of 7.65-7.7times10]3[ kg/m]3[ despite the relatively low
sintering temperature, presumably due to the high deformability of
amorphous alloy near the crystallization temperature. The structure
formed after annealing at 1023 K for 180 s shows a nanocrystalline
composite consisting of bcc-Fe, Nd[2]Fe[14]B, and Fe[3]B or Fe[2]B
phases with grain sizes of 20-40nm. The nanocrystalline bulk
Fe[76]Co[10]Nb[2]Nd[7]B[5] alloy shows anisotropic hard magnetic
properties and the maximum energy product (BH)[max] measured parallel
to the press direction are 80 and 72 kJ/m]3[ for Fe[88]Nb[2]Nd[5]B[5]
and Fe[76]Co[10]Nb[2]Nd[7]B[5], respectively.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:nanocrystalline Fe-based alloy, hard magnetic alloy,
nanocrystallization, consolidation, powder metallurgy
******************************************************************************
[ID ]:KL98S007
[AUTH]:Koshiba Hisato, Inoue Akihisa and Makino Akihiro
[TITL]:Nanocrystallization and Magnetic Properties of
Fe[56]Co[7]Ni[7]Zr[2]M[8]B[20](M=Nb or Ta) Glassy Alloys
[SOUR]:Nanostruct. Mater., 8[8] (1997), 997-1005
[LAB ]:(2); Inoue; Alps Electric Co., Ltd.
[ABST]:Glassy alloys with a wide supercooled liquid region before
crystallization were found in melt-spun Fe[56]Co[7]Ni[7]Zr[2]M[8]B[20]
(M=Nb or Ta) alloys. The temperature interval of the supercooled liquid
region defined by the difference between glass transition temperature
(T[g]) and crystallization temperature (T[x]), Delta T[x](=T[x]-T[g])
is about 60 K for these alloys. The crystallization occurs through
distinct two stages. The crystallization behavior seems to reflect the
existence of Fe[2](M, Zr) phase resulting from the weaker bonding
nature of Fe-M pair as compared with Fe-Zr pair. Good soft magnetic
properties are obtained in the annealed state for 300s at 800K below
T[g] for these alloys. Saturation magnetization (I[s]), coercive force
(H[c]) and effective permeability (mu[e]) at l kHz are about 0.8T, 2A/m
and 18000, respectively. The above-mentioned glassy alloys with wide
supercooled liquid region and good soft magnetic properties have a
strong possibility of producing soft magnetic bulk amorphous alloys.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:Fe-based glassy alloy, nanocrystallization, magnetic property, glass
transition, supercooled liquid
******************************************************************************
[ID ]:KL98S008
[AUTH]:Koshiba Hisato, Inoue Akihisa and Makino Akihiro
[TITL]:Thermal Stability and Soft Magnetic Properties of
Fe[56]Co[7]Ni[7]Zr[10-x]M[x]B[20](M=Nb,Ta) Amorphous Alloys (in
Japanese)
[SOUR]:Magnetics Kenkyukai Shiryo, Denki Gakkai, MAG-97-159 (1997), 25-29
[LAB ]:(2); Inoue; Alps
[ABST]:An amorphous phase with a wide supercooled liquid region (Delta T[x])
before crystallization was formed in Fe[56]Co[7]Ni[7]Zr[10-X]M[X]B[20]
(M=Nb or Ta, x=0 to 10) alloys by melt spinning. The Delta
T[x](=T[x]-T[g]) defined by the difference in the glass transition
temperature (T[g]) and crystallization temperature (T[x]) increases by
the dissolution of 2%M and exhibits a maximum value exceeding 80K which
are larger by about 20K than the largest value for newly developed
Fe-Ga-Al-P-C-B amorphous alloys. The saturation magnetization, coercive
force and effective permeability at 1kHz in the annealed state for 300s
at 800K are, respectively, 0.75T, 1.1A/m and 25000 for the 2%Nb alloy
and 0.85T, 1.5A/m and 17400 for the 8%Ta alloy. It is expected that the
these Fe-based amorphous alloys develop as bulk amorphous materials
which have good soft magnetic properties.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:amorphous alloy, rapid solidification, supercooled liquid region, soft
magnetic properties
******************************************************************************
[ID ]:KL98S009
[AUTH]:Naitoh Yutaka, Bitoh Teruo, Hatanai Takashi, Makino Akihiro, Inoue
Akihisa and Masumoto Tsuyoshi
[TITL]:Applications of Nanocrystalline Soft Magnetic Fe-M-B (M=Zr, Nb) Alloys
[SOUR]:Nanostruct. Mater., 8[8] (1997), 987-995
[LAB ]:(2); Alps Electric Co., Ltd.; Inoue; The Res. Inst. of Electrical and
Magn. and Mater.
[ABST]:We have succeeded in the development of new nanocrystalline soft
magnetic Fe-M-B (M=Zr, Hf, Nb) alloys with high saturation magnetic
flux density (B[s]) above 1.5T as well as excellent soft magnetic
properties. For example, the alloys show high permeability (mu[e]) of
16x10]4[ at 1 kHz, highB[s] of 1.57T and zero-magnetostriction,
simultaneously. In this paper, we report on the performance of toroidal
cores with a gap, common mode choke coils and pulse transformers. The
excellent characteristics of the components were found in conjunction
with very low core losses, sufficient thermal stability and low stress
sensitivity for magnetic properties. The nanocrystalline Fe-M-B based
alloys are, therefore, expected to be used for many kinds of magnetic
components.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:nanocrystalline alloy, Fe-based alloy, soft magnetism, application,
amorphous phase
******************************************************************************
[ID ]:KL98S010
[AUTH]:Nojiri Hiroyuki, Hamamoto Terufumi, Wang Zhang Jie, Mitsudo Seitaro,
Motokawa Mitsuhiro, Kimura Shojiro, Ohta Hitoshi, Ogiwara A.
[TITL]:Magnetic Phase Diagram and Antiferromagnetic Resonance in
CuGe[1-y]Si[y]O[3]
[SOUR]:J. Phys.: Condens. Matter, 9 (1997), 1331-1338
[LAB ]:(2); Motokawa; Kobe Univ.; Aoyama-Gakuin Univ.
[ABST]:Magnetization and ESR measurements have been performed on Si-doped
CuGe[1-y]Si[y]O[3] (y=0.01 and 0.02) single crystals. The y=0.01 sample
shows a spin-Peierls transition at T[sP]=11 K as well as undoped
material and additionally show an antiferromagnetic state below
T[N]=2.8K. When an external field is applied to the c-axis below T[N],
two magnetization jumps due to the spin-flop and the transition from
dimerized spin-Peierls phase to magnetic phase are observed at 0.98 T
and 11.5 T, respectively, which means the coexistence of spin-Peierls
and antiferromagnetic states. On the other hand, the y=0.02 sample
shows only an antiferromagnetic transition at T[N]=4.8 K.
[TYPE]:Magnetic Materials and Electronic Materials
[PROP]:spin-Peierls, electron spin resonance, magnetic phase diagram, impurity
effect
******************************************************************************
[ID ]:KL98S011
[AUTH]:Faqir Hakim, Monnereau Odile, Chiba Hiroshi, Kikuchi Masae and Syono
Yasuhiko
[TITL]:Crystal Growth in Bi-Sr-Ca-Cu-O System
[SOUR]:Appl. Supercond., 5[1-6] (1997), 27-31
[LAB ]:(2); Syono; Mater. Univ. of Provence, France
[ABST]:We report growth of Bi[2]Sr[2]CaCu[2]O[8+delta] single crystals with
dimensions of 6times2times0.03mm]3[ using a melt and growth technique.
The oxygen content is determined to be delta approx0.13 by iodometric
titration. The crystal is shown to be homogeneous and close to
stoichiometric cation ratio. The superconducting temperature with a
sharp transition width (10-90% level) of 6-8 K was determined to be
T[c]=92K from resistivity and dc susceptibility measurements. The
predominant impurity phase is a Cu-free crystal, whose composition is
identified as Bi[10]Sr[11]Ca[5]O[x]. The crystal structure of
Bi[10]Sr[11]Ca[5]O[x] is monoclinic with a=11.108(1) angstrom,
b=5.9487(1) angstrom; c=19.838 (3) angstrom and beta=101.5 (P2[1/c]
space group).
[TYPE]:Superconductors
[PROP]:Bi[2]Sr[2]CaCu[2]O[y], Bi[10]Sr[11]Ca[5]O[y], crystal growth,
superconductivity, oxygen content
******************************************************************************
[ID ]:KL98S012
[AUTH]:Maeda Hiroshi, Kakimoto Katsumi, Kikuchi Michio, Willis Jeffrey Owen,
Watanabe Kazuo, Tanaka Yoshiaki and Kumakura Hiroaki
[TITL]:Microstructures and Superconducting Properties of V Doped Bi2223 Tapes
[SOUR]:Appl. Supercond., 5[1-6] (1997), 151-156
[LAB ]:(1); Maeda; LDRAM; HFLSM; National Res. Inst. for Met.
[ABST]:We prepared Ag-sheathed tapes by the powder-in-tube method using V
doped Bi2223 powder. We found that V doping into Bi oxide
superconductors greatly enhances the Bi2223 phase formation of the
tapes without any degradation of the superconducting critical
temperature T[c]. The doped V is not included in the Bi2223 (or Bi2212)
grains, but instead exists as Sr[6]V[2]O[11] particles with diameters
of 0.1 to several micrometers, in which the larger plate-like particles
play an important role to promote the formation of the Bi2223 phase.
With V doping, the optimum critical current density J[c] value is
obtained for a short time heat treatment.
[TYPE]:Superconductors
[PROP]:Bi2223, superconductivity tape, V doping, critical current density
******************************************************************************
[ID ]:KL98S013
[AUTH]:Jeong Ha Guk, Mabuchi Mamoru, Higashi Kenji and Hiraga Kenji
[TITL]:Interface Structure of Si[3]N[4]-Reinforced Al-Based Alloy Composites
Studied Transmission Electron Microscopy
[SOUR]:THERMEC'97: Proc. Int. Conf. Thermomechanical Processing of Steels &
Other Materials,ed. by T. Chandra and T. Sasaki, (1997), 1201-1207
[LAB ]:(2); Hiraga; National Indust. Res. Inst. of Nagoya; Dept. of Mechanical
Systems Eng., College of Eng., Univ. of Osaka Prefecture
[ABST]:The microstructure of composites of Al-based alloys (Al-Cu-Mg (2124
alloy) and Al-Cu (Mg-free) alloys) and Si[3]N[4] whiskers or particles,
has been studied by high-resolution electron microscopy, laying
particular emphasis on interfaces between the Al-matrix and Si[3]N[4]
crystals. The composites of the 2124 alloy and Al-Cu alloy, which
exhibit high superplastic elongation and low elongation at a strain
rate of 4times10]-2[s]-1[ at 818K respectively, show remarkable
different interface structures. For the 2124 alloy composites, a few
reaction precipitates along the interfaces are observed in the sample
prepared by hot-extrusion at 733K, and strong reaction between the
Al-matrix and Si[3]N[4] crystals and many reaction precipitates along
the interfaces are observed in the sample tensile-tested at 818K. On
the other hand, for the Al-Cu alloy composites, both the as-extruded
and tensile-tested samples show no reaction between the Al-matrix and
Si[3]N[4] crystals.
[TYPE]:Composite Materials
[PROP]:Si[3]N[4], interface structure, composite, high-resolution electron
microscopy
******************************************************************************
[ID ]:KL98S014
[AUTH]:Kawamura Yoshihito, Kato Hidemi, Inoue Akihisa and Masumoto Tsuyoshi
[TITL]:Effects of Extrusion Conditions on Mechanical Properties in Zr-Al-Ni-Cu
Glassy Powder Compacts
[SOUR]:Mater. Sci. Eng., A219 (1996), 39-43
[LAB ]:(1); Inoue; Masumoto
[ABST]:We report on extrusion conditions such as the powder handling
processing and extrusion ratio and temperature in the production of
glassy alloy compacts by means of the warm extrusion of powders at a
supercooled liquid state. The alloy used was a Zr[65]Al[10]Ni[10]Cu[15]
(at.%) glassy alloy which has a significant supercooled liquid region
of 105K. The glassy powder compacts with almost the same tensile
strength as the melt-spun glassy ribbons or the as-cast glassy bulks
were produced by an extrusion in the supercooled liquid state at
extrusion ratios above 4 by means of ordinary powder metallurgy
processing. Closed processing, in which the powder was handled in a
well-controlled atmosphere without being exposed to air, moreover, led
to a higher level of strength as compared with ordinary processing, and
full strength at extrusion ratios above 3, due to improvement in the
powder particle bonding state. This seems to greatly affect the future
development of bulk amorphous alloys that have complex shapes and novel
properties.
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:bulk amorphous alloy, consolidation, gas atomization, extrusion,
mechanical property
******************************************************************************
[ID ]:KL98S015
[AUTH]:Hiraga Kenji
[TITL]:High-Resolution Electron Microscopy of Quasicrystals
[SOUR]:High-Resolut. Electron Microsc. of Quasicrystals, 101 (1997), 37-98
[LAB ]:(3); Hiraga
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:quasicrystal, high-resolution electron microscopy
******************************************************************************
[ID ]:KL98S016
[AUTH]:Hiraga Kenji, Ohsuna Tetsu and Sugiyama Kazumasa
[TITL]:An Atom Cluster Model of F-Type Icosahedral Quasicrystals, Derived from
the Structure of 1/1 Cubic Approximant Phase (alpha-(AlPdMnSi))
[SOUR]:J. Phys. Soc. Jpn., 66[12] (1997), 3700-3702
[LAB ]:(3); Hiraga
[ABST]:We propose an atom cluster model of F-type icosahedral quasicrystals
based on the structure of an alpha-(AlPdMnSi) phase, which is a p/q=1/1
cubic approximant of icosahedral quasicrystals. In the model, large
dodecahedral and small icosahedral atom clusters, which are located at
the (1/2,1/2,1/2) and (0,0,0) positions in the alpha-(AlPdMnSi)
structure, respectively, are placed at twelvefold sites classified into
two groups in the three-dimensional Penrose lattice. A diffraction
pattern of this model reproduces well the characteristic features of an
electron diffraction pattern of the F-type Al-Pd-Mn icosahedral
quasicrystal.
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:icosahedral quasicrystal, approximant, structure
******************************************************************************
[ID ]:KL98S017
[AUTH]:Inoue Akihisa, Fan Cang, Zhang Tao and Takeuchi Akira
[TITL]:High Mechanical Strength and Good Ductility of Zr-Based Bulk Amorphous
Alloys Containing Nanoscale Compound Particles
[SOUR]:Int. Symp. Designing, Processing and Properties of Advanced Engineering
Materials, JSPS AEM 156 Committee., (1997), 227-239
[LAB ]:(3); Inoue
[ABST]:This paper deals with the review on the recent progress of bulk
amorphous alloys as well as bulk amorphous + nanocrystalline alloys.
The nanocrystalline structure consisting of nanoscale intermetallic
compounds surrounded by the remaining amorphous phase was formed by
partial crystallization of Zr-Al-Cu-Ni-M amorphous alloys containing
M=Ag, Pd, Pt or Au. The tensile fracture strength, Vickers hardness and
Young's modulus of the melt-spun ribbon and the cast bulk amorphous
alloy of 5mm in diameter increase almost linearly with increasing
volume fraction of the compound phase. The formation of the mixed phase
alloys with good ductility is presumably due to the reentrance of a
high volume fraction of free volumes into the remaining amorphous phase
caused by quenching from the supercooled liquid region.
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:zirconium-based bulk amorphous alloy, high mechanical strength, good
ductility, nanoscale compound, supercooled liquid region
******************************************************************************
[ID ]:KL98S018
[AUTH]:Kawamura Yoshihito, Shibata Tsutomu and Inoue Akihisa
[TITL]:Superplastic-Like Deformation Behavior in Zr-Based Metallic Glass
[SOUR]:Proc. IMSP'97, Mie University Press, (1997), 155-162
[LAB ]:(1); Inoue; Nippon Spark Plug Co. Ltd.
[ABST]:Mechanical properties of glassy solid and supercooled liquid in a
Zr[65]Al[10]Ni[10]Cu[15] metallic glass that has a wide supercooled
liquid region of 105K before crystallization were investigated. The
supercooled liquid above the glass transition temperature exhibited
superplastic-like behavior during isothermal tensile deformation at
high strain rates. The flow stress increased with increasing strain
rate and decreasing temperature. The plot of log sigma versus log
varepsilon exhibited a sigmoidal shape. The supercooled liquid
exhibited a strain-rate sensitivity exponent (m value) of nearly 1.0
and large elongation exceeding 200%. The largest elongation of 340% was
achieved at a high strain rate of 5.0times10]-2[s]-1[ and at a
temperature of 0.60T[m] (673K). The superplastic-like deformation
behavior is promising for further development of metallic glasses with
a wide supercooled liquid region as a new material with high strength
and good workability.
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:amorphous alloy, metallic glass, supercooled liquid superplasticity
******************************************************************************
[ID ]:KL98S019
[AUTH]:Li Xing Zhong and Hiraga Kenji
[TITL]:Structure of the Al-Rh-Cu Decagonal Quasicrystal: II. A
Higher-Dimensional Description
[SOUR]:Physica B, 240 (1997), 338-342
[LAB ]:(3); Hiraga
[ABST]:A higher-dimensional description has been applied to the structural
model of the Al-Rh-Cu decagonal quasicrystal described in a unit-cell
approach in the previous paper (Part I), which was proposed on the
basis of a high-resolution electron microscopic study. The structure of
the Al-Rh-Cu decagonal quasicrystal consists of two layers in a period,
which are related by 10[5] screw axis. The independent layer is
described by two hyper-atoms in the five-dimensional structure.
Hyper-atoms of the Al-Rh-Cu DQC are at special positions with the site
symmetry 5m, the acceptance domain of the Al-Rh-Cu decagonal
quasicrystal in the internal (perpendicular) space can be viewed as the
extensions of those for the Penrose tiling. The geometric and chemical
structures of these hyper-atoms are described in detail. A projection
of the five-dimensional structure into the external (physical) space
generates the ideal quasiperiodic structure of the Al-Rh-Cu decagonal
quasicrystal mentioned in the previous paper (Part I).
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:Al-Rh-Cu, quasicrystal, decagonal quasicrystal, structure
******************************************************************************
[ID ]:KL98S020
[AUTH]:Li Xing Zhong, Hiraga Kenji and Yubuta Kunio
[TITL]:Structure of the Al-Rh-Cu Decagonal Quasicrystal: I. A Unit-Cell
Approach
[SOUR]:Physica B, 240 (1997), 330-337
[LAB ]:(3); Hiraga
[ABST]:Structure of the Al-Rh-Cu decagonal quasicrystal has been studied by
high-resolution electron microscopy. The high-resolution structure
image shows an aperiodic tiling composed of three kinds of subunits,
namely flattened hexagon, crown and five star. Therefore, a structural
model of the Al-Rh-Cu decagonal quasicrystal has been constructed in a
unit-cell approach, in which the atom arrangements in the subunits have
been proposed. It is known that the phase has two layers in a period of
0.4nm along the unique tenfold axis according to the previous study by
electron diffraction method. The ideal model of the Al-Rh-Cu decagonal
quasicrystal is proposed as periodic stacking of the layers with
quasiperiodic tessellation of the three kinds of subunits, in each
layer the two-colour Penrose tiling is obtained if different atom
decorations for the same shape subunits are distinguished by white and
black colours. Calculated images reproduces well the contrast features
of the observed images, which means that the present model is basically
correct. Structural relationship between the Al-Rh-Cu decagonal
quasicrystal and the previously reported Al-Ni-Co decagonal
quasicrytsal, which has also a period of 0.4nm, has also been
discussed.
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:Al-Rh-Cu, quasicrystal, decagonal quasicrystal, structure
******************************************************************************
[ID ]:KL98S021
[AUTH]:Tsurui Takao, Shibata Kaoru and Suzuki Kenji
[TITL]:Short Range Structure of Superionic Glass System CuI-Cu[2]MoO[4]
[SOUR]:KENS Rep., 4 (1997), 72-73
[LAB ]:(3); Suzuki
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:CuI-Cu[2]MoO[4], superionic conductor, neutron scattering
******************************************************************************
[ID ]:KL98S022
[AUTH]:Yubuta Kunio, Sugiyama Kazumasa and Hiraga Kenji
[TITL]:Structure of an Al-Pd-Co Crystalline Approximant with Non-Central
Symmetry
[SOUR]:Proc. 6th Int. Conf. Quasicrystals, (Yamada Conf. XLVII), (1997),
235-238
[LAB ]:(3); Hiraga
[ABST]:The structure of crystalline approximant of decagonal quasicrystals
with non-central symmetry, called the W-phase, which was found in a
conventionally solidified Al[73]Pd[5]Co[22] alloy, is analyzed by a
combination of high-resolution electron microscopy and single-crystal
X-ray diffraction. The W-phase has an orthorhombic structure with
parameters a=0.816nm, b=1.992nm and c=2.351nm, however in the present
work a tentative structure model with a/2 has been refined by a
least-squares method. The structure can be characterized as a
two-dimensional arrangement of decagonal atom columns with about 2nm in
diameter, and an ordered arrangement of Co atoms on the planes
perpendicular to the a-axis causes non-central symmetry.
[TYPE]:Amorphous Materials and Quasicrystals
[PROP]:Al-Pd-Co, quasicrystal, crystalline approximant, crystal structure
******************************************************************************
[ID ]:KL98S023
[AUTH]:Watazu Akira, Masumoto Hiroshi, Masuda Yoichiro and Hirai Toshio
[TITL]:Optical Properties of c-Axis Oriented Ba[2]NaNb[5]O[15] Thin Films
Formed by Electron Cyclotron Resonance Plasma Sputtering
[SOUR]:J. Ceram. Soc. Jpn., Int. Ed., 105 (1997), 740-742
[LAB ]:(1); Hirai; Hachinohe Inst. of Technol.
[ABST]:Thin films of Ba[2]NaNb[5]O[15] (BNN) with (001) orientation were
formed on sapphire (0001) substrates by electron cyclotron resonance
plasma sputtering using ring shaped targets. The thin films were
obtained at a substrate temperature of 773K using a target of
Ba:Na:Nb=1.2:1.2:5.0 composition. The surface of BNN thin films was
flat. The thickness of BNN thin films was estimated to be 7.2mu m. The
absorption edge of BNN films was about 310nm. The transmittance in the
wavelength between 400 and 2500nm was more than 75%. The refractive
index of the film was estimated to be 2.25-2.34 at 1100 to 2500nm.
[TYPE]:Thin Films and Multilayers
[PROP]:electron cyclotron resonance plasma sputtering, Ba[2]NaNb[5]O[15], thin
film, transmittance, refractive index
******************************************************************************
[ID ]:KL98S024
[AUTH]:Louzguine Dmitri V.
[TITL]:Effect of Ge Addition to Si[50-55]Al[25-20]Fe[10]Ni[5]Cr[5]Zr[5] Alloys
Obtained by Melt Spinning
[SOUR]:Nanostruct. Mater., 8[8] (1997), 1007-1013
[LAB ]:(3); Inoue
[ABST]:Microstructure of Si[50-55]Al[25-20]Fe[10]Ni[5]Cr[5]Zr[5] alloys
obtained by rapid solidification changes from homogeneously amorphous
to heterogeneous - amorphous+c-Ge (c-Ge: crystalline Ge solid solution)
by the addition of Ge. The size, volume fraction and composition of
c-Ge particles depend on Ge concentration in the alloy. Fine particles,
with a size less than 10nm, were obtained at 7-10at.% Ge. Small size
and homogeneous distribution of c-Ge particles argue for homogeneous
nucleation from the melt during rapid solidification. The
Si[55-45]Al[20]Fe[10]Ni[5]Cr[5]Zr[5]Ge[0-10] alloys are characterized
by high values of hardness (935-1085 Hv) and electrical resistivity
(11.0-12.6mu Omega m). The exclusion of Ge from the amorphous phase
resulted from the complicated interaction between constituent elements
when weak bonding nature among Ge, Al and TM (TM-transition metals)
atoms is obscured by strong attractive interaction among Si, Al and TM
atoms.
[TYPE]:Fine Particles, Microclusters, Mesoscopic and Nanometer
[PROP]:Si-based alloy, amorphous phase, Ge particle nanocrystalline phase,
melt spinning
******************************************************************************
[ID ]:KL98S025
[AUTH]:Sluiter Marcel H.F
[TITL]:Prediction of Matrix-Precipitate Interfacial Free Energies: Application
to Al-Al[3]Li
[SOUR]:Sci. Rep. RITU, A41[2] (1996), 97-101
[LAB ]:(2); LDRAMD; Sandia National Lab., USA; Kawazoe
[ABST]:Many aspects of the behavior of bulk materials are determined by the
properties of interfaces. In the field of metallurgy, for example, the
interfacial free energy is a crucial factor in the theory of the
nucleation, growth, and morphology of precipitates. So far the
complexity associated with the inherent disorder at an interface has
eluded the ab-initio computation of its free energy and other
thermodynamic properties. Here, we show that a particular type of
interface can be modeled from first-principles with remarkable accuracy
by combining the statistical thermodynamics of the Ising Hamiltonian
with the zero-temperature energetics from ab-initio
local-density-functional electronic structure calculations.
[TYPE]:Phase Diagram and Transformation
[PROP]:Al-Al[3]Li system, cluster variation method, first principles
calculation
******************************************************************************
[ID ]:KL98S026
[AUTH]:Sluiter Marcel H.F
[TITL]:First-Principles Calculation of the Pressure Dependence of Phase
Equilibria in the Al-Li System
[SOUR]:Phys. Rev. B, 53[10] (1996), 6137-6151
[LAB ]:(2); LDRAMD; Univ. of California; Kawazoe
[ABST]:The solid-phase portion of the Al-Li phase diagram has been computed
from first principles both at zero pressure and at a hydrostatic
compression of 5.4 GPa. Computation of the pressure dependence of the
Al-Li phase equilibria answers two questions: (1) how important is the
effect of the atomic size difference, and (2) is the stability of the
Al[3]Li precipitates influenced by high hydrostatic stress. The
zero-pressure first-principles phase diagram exhibits excellent
qualitative agreement with experimental data. The presence or absence
of solid solutions (SS), of stable and metastable intermetallic phases,
and their degree of order are computed correctly. Compression is
predicted to affect the phase equilibria in Al-Li as follows: (1) the
solubility of Li in fcc Al-rich SS is decreased, (2) the solubility of
Al in Li is increased. However, the low melting point of Li limits the
range of SS, and (3) the metastable Al[3]Li Al-rich fcc SS phase
equilibrium is unaffected and the stability of the precipitates is
unchanged, (4) the ordering tendencies at Li-rich compositions are
slightly enhanced. Although high pressure eliminates the difference in
atomic volume of the pure constituents, it has almost no effect on the
solid-solid phase equilibria in this alloy system. A simple method for
verifying the accuracy of the cluster expansion for the configurational
internal energy is presented and applied. Moreover, it has been shown
that with a convenient choice of the occupation numbers, one can define
correlation functions which greatly facilitate the determination of new
ground state structures.
[TYPE]:Phase Diagram and Transformation
[PROP]:Al-Li, first principles, atomic size dependence, cluster variation
method
******************************************************************************
[ID ]:KL98S027
[AUTH]:Yu Jing Zhi, Sluiter Marcel H.F
[TITL]:Study of fcc and bcc Based Phases in the Al-Ag System
[SOUR]:Sci. Rep. RITU, A41[2] (1996), 153-155
[LAB ]:(2); Kawazoe; LDRAMD
[ABST]:A first-principles study is reported on the Al-Ag system using the
cluster variation method(CVM). The first-principles calculations are
based on LMTO-ASA electronic total energy calculations and effective
cluster interactions on fcc and bcc lattices were extracted. These
interactions are used to compute the stable and metastable phase
equilibria under ambient pressure. The calculations indicate that at
low temperature under ambient pressure an order-disorder transformation
occurs in the phase that precipitates from the fcc Al-rich solid
solution. The computed miscibility gap is in fair agreement with the
experimental result.
[TYPE]:Phase Diagram and Transformation
[PROP]:Al-Ag, first principles calculation, phase stability, cluster variation
method
******************************************************************************
[ID ]:KL98S028
[AUTH]:Lin Fan, Chen Xiao Bin, Fu Rong Tang, Sun Xin and Kawazoe Yoshiyuki
[TITL]:The Relationship between Phase Transition and Superimposition of Fermi
Surface in Low Dimensional System (in Chinese)
[SOUR]:Butsuri Gakuho (Acta Physica Sinica), 46[10] (1997), 1972-1976
[LAB ]:(2); Fudan Univ.; Yongzhou Univ.; Kawazoe
[TYPE]:Phase Diagram and Transformation
[PROP]:Peierls phase transition, phase stability, low dimensional system
******************************************************************************
[ID ]:KL98S029
[AUTH]:Masuda-Jindo Kinichi and Sluiter Marcel H.
[TITL]:Application of Tight-Binding Electronic Theory to Phase Stability and
Mechanical Properties of Intermetallic Compounds
[SOUR]:J. Phase Equilib., 18[6] (1997), 628-634
[LAB ]:(2); Dept. of Mater. Sci. and Eng., Tokyo Inst. of Technol.; LDRAMD
[ABST]:The phase stability and mechanical properties of ordered intermetallic
compounds are investigated using the tight-binding (TB) electronic
theory. The authors use the semiempirical TB method (for the
lattice-relaxation calculations), as well as the first principles
TB-LMTO approach based on the density-functional theory. The authors
focus their attention on the strength anomaly in IVa-VIII intermetallic
compounds with B2 structure. It has been shown experimentally that
CoTi, CoZr, and CoHf display the positive temperature dependence of
yield stress at intermediate temperatures while FeTi does not have
their characteristics, depending on the position of the alloying
elements in the periodic table. The observed strength anomaly operating
at intermediate temperatures is discussed in conjunction with the
relative phase stability of B2 structure with respect to B[f] or B[19]
phase and dislocation core structures.
[TYPE]:Phase Diagram and Transformation
[PROP]:IVa-VIII B2-compounds, tight-binding electronic theory, strength
anomaly
******************************************************************************
[ID ]:KL98S030
[AUTH]:Shinoda Tetsumori, Mishima Yoshinao, Masuda-Jindo Kinichi and Sluiter
Marcel H.
[TITL]:Tight-Binding Calculations of Cohesive Properties and Phase Diagram of
Ni-Al-X Alloy Systems
[SOUR]:J. Phase Equilib., 18[6] (1997), 624-627
[LAB ]:(2); P.&I. Lab., Tokyo Inst. of Technol.; Dept. of Mater. Sci. and
Eng., Tokyo Inst. of Technol.; LDRAMD
[ABST]:A tight-binding recursion scheme, coupled to the linear muffin-tin
orbital method, is used to study the chemical bonding and
thermodynamical properties of Ni-Al-X bcc alloys, where X denotes
solute elements such as Mn, Fe, and Co. The electronic structures are
calculated by tridiagonalizing a tight-binding Hamiltonian using the
continued fraction technique. The authors estimate the effective pair
(cluster) interaction energies V[Ni-Al], V[Ni-X], and V[Al-X] using the
direct configurational averaging method and discuss the effects of the
ternary solute atoms on the thermodynamical properties of the Ni-Al-X
alloys, using the cluster variation method. The effective pair
interaction energies are calculated by averaging over a small number of
randomly generated configurations.
[TYPE]:Phase Diagram and Transformation
[PROP]:Ni-Al-X, electronic structure, effective cluster interaction, cluster
variation method
******************************************************************************
[ID ]:KL98S031
[AUTH]:Ohsuna Tetsu, Terasaki Osamu, Nakagawa Yumi, Zones Stacey I.
[TITL]:Electron Microscopic Study of Intergrowth of MFI and MEL: Crystal
Faults in B-MEL
[SOUR]:J. Phys. Chem. B, 101[48] (1997), 9881-9885
[LAB ]:(2); Hiraga; Dept. of Phys., Graduate School of Sci. and
Interdisciplinary Res. Center, Tohoku Univ.; Chevron Res. and Technol.
Co.
[ABST]:Recently, a pure MEL type silica zeolite was successfully synthesized
by one of the authors. Boron atoms were incorporated into its framework
structure by using similar synthesis conditions with gels containing
boron in an effort to confer catalytic activity. The nature of crystal
faults in the borosilicate-MEL zeolite (B-MEL) was studied using
transmission and scanning electron microscopy (TEM and SEM). Electron
diffraction (ED) patterns show characteristic diffuse streaks along the
[100] and [010] directions. From the analyses of both the diffuse
streaks in ED patterns and high-resolution electron microscopy (HREM)
images, it was determined that the framework structure of the B-MEL
crystal has many planar faults that are parallel to the (100) and (010)
planes. The local structure of the planar faults can be interpreted by
the intergrowth of the MFI type structure, and a model of the growth
process for the B-MEL is speculated from the results.
[TYPE]:Crystal Growth and Crystal Imperfection
[PROP]:MEL, MFI, intergrowth, electron microscopy
******************************************************************************
[ID ]:KL98S032
[AUTH]:Yonenaga Ichiro
[TITL]:Czochralski Growth of GeSi Alloys
[SOUR]:Curr. Top. Cryst. Growth Res., 3 (1997), 117-124
[LAB ]:(3); Suezawa
[ABST]:The growth of bulk crystals of Ge[1-x]Si[x] alloys in the composition
range 0[x[1 by the Czochralski method is reviewed. Fully single
crystals 10-25mm in diameter and 20-70mm in length were successfully
grown for low or high Si contents and partly single crystals were grown
for intermediate Si contents. Si crystal is clarified to be useful as a
seed for the growth of GeSi alloys in the whole range. The growth
velocity for single crystal growth and the effective distribution
coefficient are discussed in solidification of solid solution system.
The variation of the composition in the grown crystal along the growth
direction is explained satisfactorily assuming complete mixing of the
melt and using the equilibrium distribution coefficient obtained from
the phase diagram. The gravity effect in the melt originating from a
large difference in the densities of Ge and Si should be taken into
account to explain the composition of the grown alloys.
[TYPE]:Crystal Growth and Crystal Imperfection
[PROP]:GeSi, solid solution semiconductor, Czochralski growth, segregation,
gravity effect
******************************************************************************
[ID ]:KL98S033
[AUTH]:Shishido Toetsu, Zheng Yu Tong, Saito Akihiro, Horiuchi Hiroyuki, Okada
Shigeru, Kudou Kunio and Fukuda Tsuguo
[TITL]:Synthesis and Properties of the RgaO[3] by Arc-Melting Method and
Comparison with the Data for RalO[3]
[SOUR]:J. Ceram. Soc. Jpn., Int. Ed., 105 (1997), 734-739
[LAB ]:(1); Fukuda; Tokyo Univ; Kanagawa Univ.
[ABST]:Synthesis of perovskite-type RGaO[3] was attempted by the arc-melting
method and compared with the data for RAIO[3]. RGaO[3] were obtained
only for R=La to Nd, however, those of RAIO[3] were obtained widely for
R=La to Tm. These regions are discussed from a view point of tolerance
factor, t. The formation range of perovskite-type compound is limited
to t=0.95 both for RGaO[3] and RAIO[3] by this synthetic method. Garnet
phase was mainly obtained for R=Sm to Lu. CeGaO[3] is crystallized in
tetragonal structure with lattice parameters of a=0.3873(1)nm,
c=0.3880(1)nm (space group: P4/mmm), which is different from cubic as
reported in literatures. CeGaO[3] is completely decomposed into
starting materials by heating in air up to 1300. The crystal
structure and thermochemical behaviour of CeGaO[3] were essentially the
same as those of CeAIO[3].
[TYPE]:Melting and Solidification
[PROP]:RgaO[3], RalO[3], arc-melting synthesis, TG-DTA, torelance factor
******************************************************************************
[ID ]:KL98S034
[AUTH]:Li Xing Zhong, Hiraga Kenji, Sugiyama Kazumasa and Yamamoto Akiji
[TITL]:Structural Relationship between the epsilon-Al[4]Cr and kappa-Al-Cr-Ni
Phases
[SOUR]:Proc. 6th Int. Conf. Quasicrystals, (Yamada Conf. XLVII), (1997),
231-234
[LAB ]:(2); Hiraga; National Inst. for Res. in Inorganic Mater.
[ABST]:The epsilon-Al[4]Cr and kappa-Al-Cr-Ni are two intermetallic phases
which are structurally related to icosahedral quasicrystals. The former
is an orthorhombic phase (space group Cmcm) and the latter is a
hexagonal phase (space group P6[3]). Recently the structures of the two
phases have been determined by us using the single-crystal X-ray
diffraction method. It has been found that the structures of the two
phases are the variants of the different periodic tessellation of a
large atom cluster, which is composed of 9 interpenetrating
icosahedra.
[TYPE]:Crystal Structure
[PROP]:Al[4]Cr, Al-Cr-Ni, crystal structure, X-ray diffraction, icosahedral
quasicrystal
******************************************************************************
[ID ]:KL98S035
[AUTH]:Matsuo Yoshie, Kaneko Michiyo, Yamanoi Toyoko, Kaji Nobutaka, Sugiyama
Kazumasa and Hiraga Kenji
[TITL]:The Structure of an Al[3]Mn-Type Al[3](Mn, Pd) Crystal Studied by
Single-Crystal X-Ray Diffraction Analysis
[SOUR]:Philos. Mag. Lett., 76[5] (1997), 357-362
[LAB ]:(2); Nara Women's University; Hiraga
[ABST]:The structure of a single-crystal with a composition of approximately
Al[75]Mn[20]Pd[5], which is isostructural to the Al[3]Mn phase, has
been investigated by X-ray diffraction analysis. The refinement of the
structure was carried out with data from 2197 observed reflections
(intensity I]2.0sigma(I)) by the least-squares method to a final R
value of 0.062. Pd atoms partially replace Al atoms at definite
positions in the Al[3]Mn structure and show a mixed occupancy with Al
atoms, with their positions significantly shifted along the b-axis. On
the basis of the structure of the Al[3](Mn, Pd) phase, we discuss the
positions of Pd atoms in the Al-Pd-Mn decagonal quasicrystal.
[TYPE]:Crystal Structure
[PROP]:Al[3]Mn, X-ray diffraction, structure analysis, crystal structure
******************************************************************************
[ID ]:KL98S036
[AUTH]:Sato Akira, Yamamoto Akiji, Li Xing Zhong, Hiraga Kenji, Haibach
Torsten and Steurer Walter
[TITL]:A New Hexagonal kappa Phase of Al-Cr-Ni
[SOUR]:Acta Crystallogr. Sect. C, 53 (1997), 1531-1533
[LAB ]:(2); National Inst. for Res. in Inorganic Mater.; Hiraga; Lab. fur
Kristallographie, Eidgenssiche Technische Hochschule-Zentrum,
Switzerland
[ABST]:A new hexagonal aluminium-chromium-nickel phase,
Al[14.4]Cr[3.4]Ni[1.1], is described. The structure includes 12
icosahedral clusters in the unit cell, each of which consists of a
transition metal (TM) atom at the center and 11 aluminium and one TM
atom on the fivefold vertices of the icosahedron. Pairs of the clusters
are linked along the c axis by sharing a triangular face. Two pairs of
the clusters are joined by two trigonal antiprisms, constructing a
column along the c axis. Six such columns are included in the unit cell
and form the crystal structure. The second neighboring atoms connecting
the columns are on the threefold axes of the icosahedral cluster.
[TYPE]:Crystal Structure
[PROP]:Al-Cr-Ni, intermetallic compound, X-ray diffraction, crystal structure
******************************************************************************
[ID ]:KL98S037
[AUTH]:Kim Chang Young, Shen Z.X
[TITL]:Separation of Spin and Charge Excitations in One-Dimensional SrCuO[2]
[SOUR]:Phys. Rev. B, 56[24] (1997), 15589-15595
[LAB ]:(2); Stanford Univ.; Univ. of Tokyo; Maekawa
[ABST]:In this paper we expand on our earlier results [Phys. Rev. Lett. 77,
4054(1996)] on angle-resolved photoemission studies on one-dimensional
SrCuO[2] that reveal a behavior of a hole in Cu-O chain. The results
cannot be explained within the conventional band theory, but require a
picture in which the spin and charge degrees of freedom for a single
electron are separated. Instead of a single branch as predicted in band
theory, E versus k relationship can be explained by underlying spinon
and holon excitations scaled by hopping energy t and exchange energy J,
respectively, indicating separated spin and charge excitations. This is
an experimental observation of direct consequence of the spin-charge
separation driven by electron correlations that was first predicted
thirty years ago. It also shows spinon and holons are real particles
with definite energy-momentum dispersions.
[TYPE]:Electronic Structure
[PROP]:SrCuO[2], spin-charge separation, angle-resolved photoemission
spectroscopy
******************************************************************************
[ID ]:KL98S038
[AUTH]:Ozawa Michihide, Matsumura Takeshi, Uesawa Akihiro, Suzuki Takashi,
Sakon Takuo, Nakanishi Yoshiki, Nojiri Hiroyuki and Motokawa Mitsuhiro
[TITL]:dHvA Effect of DySb in Quadrupole Ordered State
[SOUR]:Physica B, 230-232 (1997), 744-747
[LAB ]:(2); Dept. of Phys., Tohoku Univ.; Motokawa
[ABST]:The dHvA oscillations for DySb is first detected for field direction
rotated in the (001)-(111)-(110) plane. The magnetic field was swept
from 65-97kOe, which covered the ferromagnetic structure with HoP-type
and ferromagnetic state. The dHvA signals are quite different between
both structures. The conduction-electron Fermi surface located at the
X[z] point was strongly reduced. It clearly shows that the interaction
between the quadrupole moment and the conduction electrons strongly
affects the Fermi surfaces for DySb compared to the other RSb.
[TYPE]:Magnetism
[PROP]:DySb, quadrupole ordering, dHvA effect, Fermi surface
******************************************************************************
[ID ]:KL98S039
[AUTH]:Goto Takayuki, Watanabe Takao, Kinoshita Kyoichi, Matsuda Azusa, Sera
Masafumi and Fukase Tetsuo
[TITL]:Cu-NMR Study on High-T[c] Cuprate La[1.89]Ca[1.11]Cu[2]O[6+delta]
(La2126)
[SOUR]:J. Low Temp. Phys., 105[3/4] (1996), 401-406
[LAB ]:(2); Fukase; NTT Basic Res. Lab.; Kobayashi
[ABST]:Cu-NMR spectra and the nuclear spin-lattice relaxation rate T]-1[[1]
have been studied intensively on the bilayer type high-T[c] cuprate
La[1.89]Ca[1.11]Cu[2]O[6+delta] (La2126). The resonance line shift
showed a monotonic decrease with lowering temperature in the normal
state, indicating that this compound belongs to the lightly-doped
region. The Curie-Weiss temperature dependence of (T[1]T)]-1[ in the
normal state shows that the pseudo spin-gap does not always exist in
the light-doped bilayer systems.
[TYPE]:Magnetic Resonance and Mossbauer Effects
[PROP]:La-based high-T[c] cuprate, bilayer-type CuO plane, NMR, spin-gap
******************************************************************************
[ID ]:KL98S040
[AUTH]:Mogi Iwao, Okubo Susumu and Kamiko Masao
[TITL]:Morphology Tailoring of Electrochemical Deposits by Strong Magnetic
Fields
[SOUR]:Curr. Top. Cryst. Growth Res., 3 (1997), 105-115
[LAB ]:(3); Motokawa
[ABST]:Magnetic field effects on electrochemical depositions are classified
into the magnetohydrodynamic (MHD) convection effect on
electrodepositions, the micro-MHD effect (the Lorentz force acting on
the diffusive motion of ions) on electroless depositions, and the
effect of diamagnetic orientation on electropolymerizations. These
effects on fractal growth morphology are reviewed from viewpoints of
morphology tailoring and pattern formation science.
[TYPE]:Electrochemical Properties, Corrosion and Catalysis
[PROP]:electroless deposition, electrodeposition, morphology, magnetic field
******************************************************************************
[ID ]:KL98S041
[AUTH]:Yoshida Hajime, Lee Guo Tai, Xu Mu Liang and Levy Moises
[TITL]:Effect of Nickel Film Thickness on the Attenuation of SAW
[SOUR]:1981 Ultrasonics Symp. Proc., IEEE, (1981), 479-481
[LAB ]:(2); Kamigaki; Univ. of Wisconsin-Milwaukee
[ABST]:SAW delay lines on quartz substrates covered with Ni exhibit a large
attenuation change for a small magnetic field. This attenuation
behavior appears to depend upon the conditions of sample preparation.
The attenuation of the SAW delay line has been measured during
deposition of the Ni film to attempt to correlate deposition conditions
with the subsequent magnetic field dependent attenuation. The insertion
loss versus thickness during deposition exhibits a sharp maximum at
sim12angstrom and a broad maximum near 200A. The sharp maximum may be
associated with resistive losses due to currents in the film produced
by the piezoelectric fields accompanying the SAW. The broad maximum
appears to be associated with magnetoelastic coupling of the SAW with
the Ni film. The magnetic field dependent attenuation will be presented
for films with thickness of 100angstrom, 200angstrom, 250angstrom and
350angstrom. Some of the deposition parameters which appear to be
important will be discussed.
[TYPE]:Mechanical Properties and Acoustic Properties
[PROP]:Ni, film thickness, SAW(surface acoustic wave), insertion loss,
magnetoelastic coupling
******************************************************************************
[ID ]:KL98S042
[AUTH]:Yoshida Hajime, Levy Moises, McAvoy Bruce and Salvo Harry Jr.
[TITL]:Frequency Dependence of the Interaction between SAW and Ni Films
[SOUR]:1981 Ultrasonics Symp. Proc., IEEE, (1981), 1036-1039
[LAB ]:(2); Kamigaki; Univ. of Wisconsin-Milwaukee
[ABST]:We measured the insertion loss of SAW delay lines at several different
frequencies (166, 233, 498, 699, 900 MHz) during Ni film deposition
between the electrodes. A broad maximum appeared around 200angstrom at
498, 699, and 900 MHz the same as at 618 MHz. Below 300 MHz the change
in insertion loss was in the range of 1 db/cm and the broad maxima were
not detectable. The magnitude of the broad maxima exhibited a frequency
dependence. Measurements at six different frequencies in a magnetic
field using a substrate having three pairs of different frequency SAW
delay lines were used to determine the anisotropy and Gilbert damping
parameters from values of the insertion loss at zero magnetic field.
[TYPE]:Mechanical Properties and Acoustic Properties
[PROP]:Ni film, SAW(surface acoustic wave), frequency dependence, insertion
loss, damping factor
******************************************************************************
[ID ]:KL98S043
[AUTH]:Asano Yuichiro, Asanuma Noriko, Ito Toshihiko, Kataoka Makoto, Fujino
Shinya, Yamamura Tomoo, Sugiyama Wataru, Tomiyasu Hiroshi, Mizumachi
Kunihiko, Ikeda Yasuhisa, Wada Yukio and Asou Masami
[TITL]:Study on a Nuclear Fuel Reprocessing System Based on the Precipitation
Method in Mild Aqueous Solutions
[SOUR]:Nucl. Tech., 120 (1997), 198-210
[LAB ]:(2); Tokyo Inst. of Technol.; Shiokawa; Meiji Univ.; Inst. of Res. and
Innovation; Power Reactor and Nuclear Fuel Develop. Co.; Tokyo Elect.
Power Co.
[ABST]:A new reprocessing system for spent nuclear fuels based on a
precipitation method is proposed to recover uranium and transuranium
elements from spent nuclear fuels in high ratios and to achieve extreme
safety without any potential dangers. Experiments were carried out for
a simulated fuel solution containing uranium and 17 major elements. The
main reprocessing processes are as follows: (a) dissolution of UO[2]
fuel under mild conditions; (b) neutralization of the dissolved fuel
solution with Na[2]CO[3]-NaHCO[3] mixed solutions, followed by the
separation of precipitated fission products by centrifugation; (c)
separation of cesium by a precipitation method using a
tetraphenylborate ion; and (d) recovery of uranium (U) as a precipitate
of the hydrolyzed compound from an alkaline solution. As a result,
99.95% of the U was recovered with the least amount of fission
products, i.e., 10]-5[ g or even less in the recovered 1 g of U with
the only exceptions being zirconium and molybdenum.
[TYPE]:Analytical Chemistry and Spectroscopy
[PROP]:nuclear fuel reprocessing, precipitation method, mild condition,
photochemical separation
******************************************************************************
[ID ]:KL98S044
[AUTH]:Oku Masaoki, Matsuta Hideyuki and Wagatsuma Kazuaki
[TITL]:Removal of Inelastic Scattering Parts from the Mn 2p X-Ray
Photoelectron Spectrum for Potassium Permanganate by a Deconvolution
Method Using the K 2p and O 1s Spectra As a Response Function (in
Japanese)
[SOUR]:BUNSEKI KAGAKU, 46[9] (1997), 703-709
[LAB ]:(3); Wagatsuma
[ABST]:The intrinsic Mn 2p[1/2,3/2], K 2p[1/2,3/2] and O 1s spectra for
KMnO[4] were obtained from a sample in situ fractured in an ultra-high
vacuum. In order to obtain the primary excitation Mn 2p spectrum from
the observed Mn 2p spectrum, the K 2p and O 1s spectra were used as
response functions for the Fourier transform deconvolution method.
Firstly, the K 2p[1/2,3/2] spectrum was divided into two components,
2p[1/2] and 2p[3/2], by the deconvolution method. The obtained K 2p
response-function spectrum had a smaller intensity ratio of the
inelastic to non-energy loss parts than did the O 1s. However, the loss
energies of four peaks in the K 2p spectrum coincided with those in O
1s spectrum. Neglecting the noise and small peaks, the spectral
profiles of the Mn 2p spectra deconvoluted by the K 2p and O 1s spectra
agreed. The spectra had no satellite peaks.
[TYPE]:Analytical Chemistry and Spectroscopy
[PROP]:XPS, removal, inelastic parts, deconvolution, KmnO[4]
******************************************************************************
[ID ]:KL98S045
[AUTH]:Sugiyama Kazumasa, Kaji Nobutaka, Yubuta Kunio, Hiraga Kenji and
Ishimasa Tsutomu
[TITL]:Structure of A 2/1 Cubic Approximant in the Al-Pd-Mn-Si System
[SOUR]:Proc. 6th Int. Conf. Quasicrystals, (Yamada Conf. XLVII), (1997),
199-206
[LAB ]:(2); Hiraga; Dept. of Nucl. Eng., School of Eng., Nagoya Univ.
[ABST]:The structure of a cubic Al[69.5]Pd[23.0]Mn[6.2]Si[1.3] phase, which is
referred as a 2/1 approximant of an icosahedral phase, was determined
by means of single crystal X-ray structural analysis: space group Pm3,
a=20.211(2)angstrom, Mo K alpha (lambda=0.71096angstrom); refined as
Al[69.6]Pd[24.3]Mn[6.1], R(wR2)=0.062 (0.169) for 2597 reflections with
I]2.0sigma(I). An atom cluster of about 20angstrom in diameter locates
at the origin of a unit cell. The atomic arrangement of the cluster can
be described as nine atomic shells with icosahedral symmetry, parts of
which indicate similar atomic arrangements to those of the Bergman and
Mackay clusters. The present atom cluster is suggested to be one of the
basic structural units for the icosahedral quasicrystals.
[TYPE]:Diffraction and Scattering of X-ray, Electron, Neutron and Ion
[PROP]:Al-Pd-Mn, quasicrystal, icosahedral quasicrystal, crystalline
approximant, crystal structure
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[ID ]:KL98S046
[AUTH]:Yoshida Hajime, Kaneko Takejiro, Shono Masatoshi, Abe Shunya and Ohashi
Masayoshi
[TITL]:The Pressure Effect on the Neel Point of the Mixed Compounds
CrSb[1-x]As[x] (0.5[x leqslant1.0)
[SOUR]:J. Magn. Magn. Mater., 15-18 (1980), 1147-1148
[LAB ]:(3); Kamigaki
[ABST]:The pressure effect on the Neel point of the mixed compounds
CrSb[1-x]As[x] (0.5[x leqslant1.0) with a crystal structure of a
MnP-type was investigated under pressures up to 10kbar. It was found
that the initial pressure coefficient of the Neel point is negative for
the compounds with x geqslant0.7 and positive for those with x[0.7.
[TYPE]:High Pressure and Shock Wave
[PROP]:CrSb[1-x]As[x] (0.5[x leqslant1.0), high pressure, Neel point,
substitution effect, differential thermal analysis
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[ID ]:KL98S047
[AUTH]:Hashi Yuichi, Esfarjani Keivan, Ohno Kaoru and Kawazoe Yoshiyuki
[TITL]:Tight-Binding Molecular Dynamics Simulation of Fullerene Collision
Processes
[SOUR]:Sci. Rep. RITU, A41[2] (1996), 171-173
[LAB ]:(2); Hitachi; Kawazoe
[ABST]:Motivated by the possibility of observing fullerene binding, we have
performed preliminary tight-binding molecular dynamics (TBMD) of
fullerene collisions. A new parametrization that can reproduce well the
energetics of all the phases of carbon with coordination numbers
varying from 2 to 12 is proposed. In this paper, we tentatively discuss
the possibility of observing experimentally C[60]-C[60] bonding by the
C[60]-C[60] collision processes with TBMD.
[TYPE]:Molecular Dynamics Simulation
[PROP]:C[60], fullerene, tight-binding molecular dynamics, collision process
******************************************************************************
[ID ]:KL98S048
[AUTH]:Taneda Akito, Esfarjani Keivan, Hashi Yuichi and Kawazoe Yoshiyuki
[TITL]:Tight-Binding Method for Cu Clusters; Ground State Studies of
Cu[3]-Cu[12]
[SOUR]:CP416, Similarities and Differences between Atomic Nuclei and Clusters,
ed. by Abe/Arai/Lee/Yabana, (1997), 471-474
[LAB ]:(2); Kawazoe; Hitachi
[ABST]:The recently developed tight-binding parametrization of copper by MehI
and Papaconstantopoulos (1) is tested against the ab-initio Discrete
Variational Method (DVM). Good agreement is found for the eigenvalues,
and total energies. Next, this parametrization is used to perform
Molecular Dynamics (MD) and simulated annealing in order to investigate
the ground state structure of small copper clusters. In this study,
clusters of size up to 12 were considered. Results concering their
ground state geometry, binding energy and HOMO-LUMO gap are reported
and compared to available theoretical and experimental data.
[TYPE]:Molecular Dynamics Simulation
[PROP]:cooper cluster, tight-binding molecular-dynamics, simulated annealing
******************************************************************************
[ID ]:KL98S049
[AUTH]:Maruyama Yutaka, Ohno Kaoru, Esfarjani Keivan and Kawazoe Yoshiyuki
[TITL]:Ab-Initio Molecular Dynamics Simulation of Li Insertion in C[60]
[SOUR]:Sci. Rep. RITU, A41[2] (1996), 183-186
[LAB ]:(3); Kawazoe
[ABST]:Complexes composed of fullerenes and metal elements offer important
examples as new nanomaterials in the field of materials design. In the
collisions between C]-[[60] and Li]+[ in plasma state, there is a
possibility that the endohederal fullerene, Li@C[60] is created as well
as Li@C[58] and so on. To study this phenomenon theoretically, we
perform an all-electron mixed basis ab initio molecular dynamics
simulation at 1,000K which was developed by ourselves. When Li]+[ with
the kinetic energy sim5eV hits the center of a six-membered ring of
C]-[[60], an endohedral complex, Li@C[60] is created. This direcet
insertion process is possible because the ionic radius of Li]+[ is
shorter then the radius of a six-membered ring. However, if either the
kinetic energy is lower or the collision occurs off-center, the Li]+[
ion stays outside and C[60] is deformed by the shock.
[TYPE]:Theoretical Approach to Materials Design
[PROP]:Li, C[60], ab initio molecular dynamics, simulation, all-electron mixed
basis approach
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[ID ]:KL98S050
[AUTH]:Esfarjani Keivan, Hashi Yuichi, Farajian Amir Abass and Kawazoe
Yoshiyuki
[TITL]:Application of Computational Physics to the Design of New Nanoscale
Devices: Nano-Diodes and Nano-Transistors
[SOUR]:IPMM'97: Proc. Australiasia-Pac. Forum Intelligent Processing &
Manufacturing of Materials, ed. by T. Chandra, et al., 1 (1997),
171-176
[LAB ]:(2); Kawazoe; Hitachi
[ABST]:By using the tight-binding theory, we perform electronic structure
calculation of doped and undoped nanotubes. Electric properties of such
systems can be derived from our calculation. We show that when doped,
they can be used as simple N-P junctions of nanometer scale. Such
junctions are the building blocks of any microelectronic device, and
hence can allow one to make nanotransistors and nanoscale Integrated
Circuits.
[TYPE]:Theoretical Approach to Materials Design
[PROP]:carbon nanotube, transport property, doping, tight-binding
******************************************************************************
[ID ]:KL98S051
[AUTH]:Kawazoe Yoshiyuki
[TITL]:Can Materials Properties Be Predicted before Experiments? -Large Scale
Computer Simulations by the First Principles Approach-
[SOUR]:IPMM'97: Proc. Australiasia-Pac. Forum Intelligent Processing &
Manufacturing of Materials, ed. by T. Chandra, et al., 2 (1997),
955-960
[LAB ]:(3); Kawazoe
[ABST]:Based on quantum mechanics and using high-power supercomputers, it is
now possible to predict various materials properties and structures
before experiments. This computational scheme, called the first
principles approach, has a possibility to open a fundamentally new
world of materials research. In this paper, several recent successes of
our group are introduced to indicate the potential of the method.
[TYPE]:Theoretical Approach to Materials Design
[PROP]:C[60], SrTiO[3], supercomputer, molecular dynamics, parallel
processing
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