Thermal diffusivity and thermal conductivity of MgSc alloys

In this work the temperature and concentration dependence of the thermal diffusivity of MgSc alloys is reported. Measurements were carried out from 20° up to 300°C and from 3.2 up to 19.0 wt.% Sc using the flash method. The thermal conductivity was calculated as the product of density, specific heat and thermal diffusivity. The thermal conductivity of MgSc alloys increases with increasing temperature and decreases with increasing concentration of Sc. The concentration dependence of all thermophysical properties (thermal diffusivity, thermal conductivity, density and specific heat) is also presented. The results are discussed together with the electrical resistivity data from the literature. The electronic and phonon thermal conductivity is calculated using the Wiedemann-Franz law.