TY - JOUR

T1 - Variational thermodynamic calculation for simple liquid metals and alkali alloys

AU - Lai, S. K.

AU - Matsuura, M.

AU - Wang, S.

PY - 1983

Y1 - 1983

N2 - The authors first propose an approach for treating a correction from the higher-order perturbative terms to the usual low-order pseudopotential perturbation calculation for the one-valence-electron states in a disordered metal. Then, the previously used energy-independent non-local model pseudopotential (EINMP) with this correction is applied along with the original EINMP to the variational thermodynamic calculation in the framework of a hard-sphere reference system for the alkalis in the liquid phase and for the K-Rb, Na-K and Na-Cs liquid alloys. The results obtained for (i) the hard-sphere diameter, sigma , (ii) the isothermal compressibility, chi T, and (iii) the excess entropy, Sexc, are carefully examined and discussed. It appears that in going from the pure alkalis to their binary alloys, (i) the change in sigma follows closely the concept of valence-electron charge transfer, introduced previously to interpret the corresponding concentration dependence of the electrical resistivities and (ii) the deviations of chi T and Sexc from ideality for the Na-K and Na-Cs alloys are largely due to the valence-electron charge transfer, which affects sigma in Sexc and also affects the contribution from the volume dependence of the screening to chi T.

AB - The authors first propose an approach for treating a correction from the higher-order perturbative terms to the usual low-order pseudopotential perturbation calculation for the one-valence-electron states in a disordered metal. Then, the previously used energy-independent non-local model pseudopotential (EINMP) with this correction is applied along with the original EINMP to the variational thermodynamic calculation in the framework of a hard-sphere reference system for the alkalis in the liquid phase and for the K-Rb, Na-K and Na-Cs liquid alloys. The results obtained for (i) the hard-sphere diameter, sigma , (ii) the isothermal compressibility, chi T, and (iii) the excess entropy, Sexc, are carefully examined and discussed. It appears that in going from the pure alkalis to their binary alloys, (i) the change in sigma follows closely the concept of valence-electron charge transfer, introduced previously to interpret the corresponding concentration dependence of the electrical resistivities and (ii) the deviations of chi T and Sexc from ideality for the Na-K and Na-Cs alloys are largely due to the valence-electron charge transfer, which affects sigma in Sexc and also affects the contribution from the volume dependence of the screening to chi T.

UR - http://www.scopus.com/inward/record.url?scp=2542475627&partnerID=8YFLogxK

U2 - 10.1088/0305-4608/13/10/014

DO - 10.1088/0305-4608/13/10/014

M3 - 期刊論文

AN - SCOPUS:2542475627

SN - 0305-4608

VL - 13

SP - 2033

EP - 2051

JO - Journal of Physics F: Metal Physics

JF - Journal of Physics F: Metal Physics

IS - 10

M1 - 014

ER -