Electron concentration and alloy composition dependence of Hall factor in GaxIn1−xAsyP1−y

1981 ◽  
Vol 17 (19) ◽  
pp. 686 ◽  
Author(s):  
Y. Takeda ◽  
M.A. Littlejohn ◽  
J.A. Hutchby ◽  
R.J. Trew
Keyword(s):  
Electron Concentration ◽  
Composition Dependence ◽  
Alloy Composition ◽  
Hall Factor

Search and Synthesis of New Family of Quasicrystals

2003 ◽  
Vol 805 ◽  
Author(s):  
Tsutomu Ishimasa ◽  
Shiro Kashimoto ◽  
Ryo Maezawa
Keyword(s):  
Electron Concentration ◽  
Noble Metals ◽  
Alloy Composition ◽  
Starting Material ◽  
Icosahedral Quasicrystal ◽  
Base Metals ◽  
Transition Elements ◽  
New Family ◽  
Cast Alloys ◽  
P Type

ABSTRACTStarting from the Zn17Sc3 cubic approximant, new icosahedral quasicrystal was searched by substituting Zn by other metals, M, at the alloy composition of Zn75M10Sc15. In the cases of M = Mn, Fe, Co, Ni, Pd, Pt, Ag and Au, new P-type quasicrystals were discovered in as-cast alloys. In the cases of M = Fe, Co, Ni, Pd and Ag, the quasicrystals are thermodynamically stable at approximately 700 °C. This result indicates that use of an approximant crystal as a starting material is very efficient way to search new quasicrystal alloy, and many kinds of metals stabilize the quasicrystal structures; i.e. noble metals and transition elements including Mn, Fe, Co and Ni in addition to Mg. Taking the variety in base metals of Tsai-type approximants into account, this variety in additional components suggests many possibilities of undiscovered quasicrystals. The equality ofthe electron concentration, ela ≈ 2.1, in Hume-Rothery rule may be a guide to these quasicrystals.

Alloy composition dependence of defect energy levels in GaxIn1−xP/InP:Fe and GaxIn1−xP/InP:S (x≤0.24)

1993 ◽  
Vol 74 (3) ◽  
pp. 1862-1867 ◽  
Author(s):  
Y.‐G. Zhao ◽  
J. L. Brebner ◽  
R. A. Masut ◽  
G. Zhao ◽  
A. Bensaada ◽  
...  
Keyword(s):  
Composition Dependence ◽  
Alloy Composition ◽  
Energy Levels ◽  
Defect Energy

Pressure and alloy-composition dependence ofAl/Ga1−xAlxAs(100)Schottky barriers

1996 ◽  
Vol 54 (16) ◽  
pp. R11102-R11105 ◽  
Author(s):  
J. Bardi ◽  
N. Binggeli ◽  
A. Baldereschi
Keyword(s):  
Composition Dependence ◽  
Alloy Composition ◽  
Schottky Barriers

Electron concentration dependence of Hall factor in In0.53Ga0.47As

1982 ◽  
Vol 40 (3) ◽  
pp. 251-253 ◽  
Author(s):  
Y. Takeda ◽  
M. A. Littlejohn
Keyword(s):  
Concentration Dependence ◽  
Electron Concentration ◽  
Hall Factor

Alloy composition dependence of formation of porous Ni prepared by rapid solidification and chemical dealloying

2009 ◽  
Vol 472 (1-2) ◽  
pp. 71-78 ◽  
Author(s):  
Zhen Qi ◽  
Zhonghua Zhang ◽  
Haoling Jia ◽  
Yingjie Qu ◽  
Guodong Liu ◽  
...  
Keyword(s):  
Rapid Solidification ◽  
Composition Dependence ◽  
Alloy Composition

Microchemistry of Proton-Irradiated Austenitic Alloys Under Conditions Relevant to Lwr Core Components

1998 ◽  
Vol 540 ◽  
Author(s):  
G. S. Was ◽  
T. R. Allen ◽  
J. T. Busby ◽  
J. Gan ◽  
D. Damcott ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Composition Dependence ◽  
Alloy Composition ◽  
Dose Range ◽  
Boundary Segregation ◽  
Dose Dependence ◽  
Composition Analysis ◽  
Boundary Composition ◽  
Austenitic Alloys ◽  
Core Components

AbstractOver 1200 measurements of grain boundary composition and microstructure have been made on 14 different austenitic Fe-Cr-Ni alloys following proton irradiation in the temperature range 200-600°C and in the dose range 0.1-3.0 dpa. Grain boundary composition measurements revealed that Cr depletes at grain boundaries, Ni enriches and Fe can either enrich or deplete depending on alloy composition. Analysis of temperature and composition dependence of RIS revealed that the magnitude and direction of grain boundary segregation depends on alloy composition because the value of migration enthalpy differs among the alloy constituents, and diffusivities of the alloy constituents are composition-dependent. The dose dependence of segregation revealed ordering in Ni-base alloys and temperature dependence was used to show that RIS occurs by vacancy exchange rather than an interstitial binding mechanism. The dependence of segregation on composition is consistent with all known, relevant neutron data.

Effect of Alloy Composition on the Structure of Zr Based Metal Alloys

1999 ◽  
Vol 575 ◽  
Author(s):  
B. S. Chao ◽  
R. C. YOUNG ◽  
S. R. Ovshinsky ◽  
D. A. Pawlik ◽  
B. Huang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Electron Concentration ◽  
Concentration Factor ◽  
Alloy Composition ◽  
Hexagonal Structure ◽  
Metal Alloys ◽  
Transition Metal Alloys ◽  
Concentration Factors ◽  
Average Electron ◽  
Multi Phase

ABSTRACTThe structures of Ovonic multi-element, multi-phase Zr-based transition metal alloys for hydrogen storage are studied. The alloys are designed to be multi-phase materials. The hexagonal and diamond cubic structures, known as C14 and C15 Laves structures respectively, are the two major hydrogen storage phases in the alloys. In both C14 and C 15 structures, Zr and Ti are the elements typically occupying the hydride former (A) sites and V, Cr, Mn, Fe, Co and Ni the catalytic (B) sites. Based on the application of Ovshinsky's design principles for disordered materials, both A and B sites are compositionally disordered by the corresponding elements in cubic (C15) structure. However, the hexagonal (C14) structure has two distinct B sites, B(I) and B(Il) with a 1:3 ratio. Preliminary neutron diffraction studies indicate that the B(I) sites are predominantly occupied by Ni and the B(ll) sites are randomly mixed with V, Cr, Mn, Fe, and Ni. It is then proposed that the formula of the hexagonal structure should become A2B(I)IB(II) 3 in the current multi-element Zr-based alloys. Minor phases close to the structures of Zr7Ni10, Zr9Ni11, and ZrO2 are also present in some alloys. The average electron concentration factor (e/a) derived from the alloy composition dictates the alloy structures. The alloys with higher electron concentration factor (> 7.1) favor the diamond cubic structure. On the other hand, the hexagonal structure is associated with the alloys with lower electron concentration factor (< 6.5). The alloys having electron concentration factors in between are mixtures of the diamond cubic and hexagonal structures.

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