Charge distribution in liquid metals and alloys

1987 ◽  
Vol 65 (3) ◽  
pp. 286-308 ◽  
Author(s):  
S. Tamaki
Keyword(s):  
Charge Transfer ◽  
Electron Distribution ◽  
Liquid Metals ◽  
Thermodynamic Quantities ◽  
Liquid Alloys ◽  
Partial Structure ◽  
X Ray ◽  
Long Wavelength ◽  
Structure Factors ◽  
The Difference

Electron distribution in liquid metals and charge transfer in liquid alloys are qualitatively and quantitatively discussed in terms of the structure factors and the thermodynamic quantities obtained experimentally. The electron distribution around an ion in liquid metals has been derived from the difference in structure factors determined by X-ray and neutron-diffraction methods with the help of a theoretical calculation of the electron–electron correlation function. Charge transfer in liquid alloys is also estimated by using the partial structure factors in the long-wavelength limit and the Thomas–Fermi screening theory. The charge-transfer effect in liquid alloys is also verified by the measurements of partial structure factors and magnetic susceptibilities.

Partial Structure Factors of Liquid Na—K and AI—Mg Alloys

1973 ◽  
Vol 28 (6) ◽  
pp. 1002-1008 ◽  
Author(s):  
Y. Waseda ◽  
M. Ohtani ◽  
K. Suzuki
Keyword(s):  
Liquid Metals ◽  
Distribution Functions ◽  
Mg Alloys ◽  
Pure Liquid ◽  
Hard Sphere Model ◽  
Partial Structure ◽  
X Ray ◽  
Structure Factors ◽  
Adequate Agreement ◽  
Al Mg Alloys

Three partial structure factors Sij(Q) have been evaluated from the scattered X-ray intensities of liquid Na -K and Al - Mg alloys assuming that the Sij(Q) are independent of the relative abundance of the respective elements in the alloys. The functions Sii(Q) and Sjj(Q) and the reduced radial distribution functions Gii(r) and Gjj(r) obtained in this work are very similar to those observed in the respective pure liquid metals. In both cases, Sij(Q) and Gij(r) have maxima which lie in between those of the pure elements. From these results, liquid Na -K and Al -Mg alloys are interpreted as random mixing fluids. A comparison between the partial structure factors obtained in this work and those calculated from the hard sphere model was made. Adequate agreement was obtained on the low angle side of the first peak, but agreement on the whole pattern is not necessarily found. The electrical resistivity was calculated using Faber-Ziman’s theory and compared with experimental data.

scholarly journals The Structure Factors of Liquid Metals in Low Q Region

1983 ◽  
Vol 38 (5) ◽  
pp. 509-515 ◽  
Author(s):  
Y. Waseda
Keyword(s):  
Melting Point ◽  
Isothermal Compressibility ◽  
Liquid Metals ◽  
Structural Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Long Wavelength ◽  
Limit Value ◽  
Structure Factors ◽  
Increasing Function

The low Q structure factors have been determined in the region down to Q = 0.08A-1 for liquid Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Al and In at several temperatures by x-ray diffraction with the transmission mode. The low- Q structure factor is a slowly increasing function of Q, and its profile is quite similar among the liquid metals presently investigated. The long wavelength limit value of S(Q) derived from the present experimental structural data agrees well with that calculated from the isothermal compressibility for seven metals near the melting point. A differ­ence larger than 10% was found in the cases of liquid Cs, Ca and Al.

CALCULATION OF THE PARTIAL STRUCTURE FACTORS IN BINARY LIQUID ALLOYS BY A THERMODYNAMICAL APPROACH

1980 ◽  
Vol 41 (C8) ◽  
pp. C8-586-C8-589
Author(s):  
M. Favre-Bonte ◽  
J. C. Joud ◽  
P. Hicter ◽  
P. Desre
Keyword(s):  
Liquid Alloys ◽  
Partial Structure ◽  
Binary Liquid ◽  
Structure Factors

The partial structure factors of liquid alloys

1967 ◽  
Vol 16 (62) ◽  
pp. 171-175 ◽  
Author(s):  
J.E. Enderby ◽  
D.M. North ◽  
P.A. Egelstaff
Keyword(s):  
Liquid Alloys ◽  
Partial Structure ◽  
Structure Factors

Study on UV Excitation Properties of Y2O3:Ln3+ (Ln = Eu3+ or Tb3+) Luminescent Nanomaterials

2008 ◽  
Vol 8 (3) ◽  
pp. 1443-1448 ◽  
Author(s):  
Qingyu Meng ◽  
Baojiu Chen ◽  
Xiaoxia Zhao ◽  
Xiaojun Wang ◽  
Wu Xu
Keyword(s):  
Particle Size ◽  
Charge Transfer ◽  
Charge Transfer Band ◽  
Emission Spectra ◽  
X Ray Diffraction ◽  
Bulk Materials ◽  
Excitation Spectra ◽  
X Ray ◽  
Long Wavelength ◽  
Uv Excitation

Y2O3:Ln3+ (Ln = Eu or Tb) nanocrystals with different Ln3+ doping concentrations and average sizes were prepared by chemical self-combustion. The corresponding bulk materials with various doping concentrations were obtained by annealing the nanomaterials at high temperature. The emission spectra, excitation spectra, and X-ray diffraction spectra were used in this study. It was found that the charge transfer band of Y2O3:Eu3+ red-shifted as particle size decreased, and the charge transfer band in the 5-nm particles obviously broadened toward the long wavelength. It was also found that the profile of excitation spectra corresponding to the 4f5d (4f8 → 4f75d1) transition changed a lot with the variation of the particle size. The dependence of the excitation spectra of Y2O3:Ln3+ on particle size was investigated.

Structure of Zr-Cu and Zr-Ni Liquid Alloys Studied by High-Energy X-Ray Diffraction

2007 ◽  
Vol 561-565 ◽  
pp. 1349-1352 ◽  
Author(s):  
Akitoshi Mizuno ◽  
T. Kaneko ◽  
Seiichi Matsumura ◽  
Masahito Watanabe ◽  
Shinji Kohara ◽  
...  
Keyword(s):  
Liquid Structure ◽  
High Energy ◽  
Glass Forming Ability ◽  
Liquid Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Forming ◽  
Structure Factors ◽  
Asymmetric Shape ◽  
Second Peak

In order to obtain an insight into the high glass-forming ability of bulk metallic glasses, we have analyzed liquid structures of the Zr-Cu and the Zr-Ni binary alloys with different compositions. High-energy (E = 113 keV) x-ray diffraction experiments were carried out for the liquid alloys levitated by a conical nozzle levitation (CNL) technique. While a peculiar shoulder on the second peak was observed in the structure factors of the Zr-Cu liquid alloys, those of the Zr70Ni30 and the Zr50Ni50 liquids exhibit an asymmetric shape of the second peak. In addition, it was found that the effect of concentration variation in the liquid Zr-Ni alloys was significantly different from that of the liquid Zr-Cu alloys. The liquid structure analyses using the reverse Monte Carlo (RMC) simulation have clarified that a degree of the short-range correlation between the constituents in the liquids affects substantially the glass-forming ability of the binary Zr alloys.

Consistent partial structure factors for amorphousNi0.33(ZryHf1−y)0.67using x-ray and neutron diffraction

1996 ◽  
Vol 53 (14) ◽  
pp. 8983-8992 ◽  
Author(s):  
Yan Xu ◽  
W. B. Muir ◽  
Z. Altounian ◽  
W. J. L. Buyers ◽  
R. L. Donaberger
Keyword(s):  
Neutron Diffraction ◽  
Partial Structure ◽  
X Ray ◽  
Structure Factors

Partial structure factors of amorphous Ni2Zr by anomalous X-ray scattering

1992 ◽  
Vol 151 (1-2) ◽  
pp. 119-128 ◽  
Author(s):  
F. Buffa ◽  
A. Corrias ◽  
G. Licheri ◽  
G. Navarra ◽  
D. Raoux
Keyword(s):  
Partial Structure ◽  
X Ray ◽  
X Ray Scattering ◽  
Structure Factors ◽  
Ray Scattering

Chemical and Topological Short Range Order of Amorphous Ti-Si Alloys

1995 ◽  
Vol 50 (8) ◽  
pp. 749-757
Author(s):  
A. Pojtinger ◽  
R. Bellissent ◽  
P. Lamparter ◽  
S. Steeb
Keyword(s):  
Three Dimensional ◽  
Coordination Shell ◽  
Atomic Clusters ◽  
Relaxation Model ◽  
Partial Structure ◽  
X Ray ◽  
Structure Factors ◽  
Density Concentration ◽  
Reverse Monte Carlo Method ◽  
Trigonal Prismatic

Abstract Amorphous Ti100 - xSix alloys (13<x<60) were produced by sputtering. Their partial structure factors were determined by X-ray and neutron diffraction. The Bhatia-Thornton density-concentration correlation function GNC(R) was calculated by a cluster relaxation model. Three-dimensional atomic clusters were produced by the Reverse Monte Carlo method. These clusters were analyzed in terms of trigonal prismatic arrangements as a structural unit. In amorphous Ti75Si25 and Ti87Si13 those Si-atoms which are surrounded by 9 Ti-atoms in the first coordination shell prefer trigonal prismatic arrangements. In the atomic clusters of amorphous Ti59Si41, Ti49Si51, and Ti40Si60, however, no preference of trigonal prisms was found.

Sign in / Sign up

Export Citation Format

Share Document