Abstract

Thermal conductivities of solid phases for pure Lead (Pb) and Pb-x wt.% Cadmium (Cd) (x = 3.3, 5, 12, 17.4, 50, 95, 99.75) binary alloys were measured with a radial heat flow apparatus. The variations of electrical conductivity (σ) on temperature and composition for the Pb-Cd alloys were measured with DC four-point probe technique. It has been observed that the electrical conductivity of Cd-based Pb-Cd alloys increases with increasing temperature, whereas the conductivity of the Pb-Cd alloys decreases with increasing Cd component. The temperature coefficient of the electrical resistivity and the temperature coefficient of the thermal conductivity for the Pb-Cd alloys have been determined. Also, the dependency of the Lorenz number (L) on temperature and Cd component for the Pb-Cd alloys was also investigated based on the Wiedemann-Franz law by using the measured values of the thermal () and electrical (σ) conductivity for the alloys.

Key words: Thermal conductivity, electrical conductivity, radial heat flow, X-Ray powder diffraction, Lorenz number, Pb-Cd alloys.