Lattice thermal conductivity of Mg2Ge in the temperature range 4-800°K

Abstract

The Sharma-Dubey-Verma model of two-mode conduction, similar to the Holland model, has been applied to explain the phonon conductivity data of Mg2Ge in the temperature range 4-800°K. The temperature exponents 𝑚⁡(𝑇) for the three-phonon scattering relaxation rates have been calculated for both class-I and class-II events following Guthrie. Excellent agreement has been found between theoretical and experimental values of the phonon conductivity of Mg2Ge over a wide range of temperature. Separate percentage contributions of transverse and longitudinal phonons have also been calculated in the temperature range of investigation.