Electronic transport properties of liquid cadmium-germanium alloys. Theoryversus experiment

The electrical resistivity and the absolute thermoelectric power of liquid cadmium, germanium and cadmium-germanium alloys have been measured as a fun ction of temperature in 10 at.% steps between pure cadmium and 70 at.% of g ermanium. The electronic transport properties of the liquid metals and allo ys are evaluated in the framework of the extended Faber-Ziman theory using a single-site t-matrix. Various muffin tin potentials have been used in thi s calculation derived from the Hartree Fock theory, the density functional theory (local density approximation (LDA) and generalised gradient approxim ation (GGA)) and from an ionic potential. Concerning the experimental first peak asymmetry of both germanium and cadmium, the static structure factors cannot be reproduced with hard spheres. They are better described for pure metals by the Silbert-Young square well pair potential extended to alloys. (C) 1999 Elsevier Science B.V. All rights reserved.