Analysis of thermotransport and thermal and ionic conductivity in doped lanthanum gallate (LSGM) using molecular dynamics

Abstract

The lattice thermal conductivity, ionic conductivity and thermotransport of doped lanthanum gallate (LSGM) were investigated using molecular dynamics (MD) using the Green-Kubo formalism across a wide temperature range. The lattice thermal conductivity was estimated by the heat current autocorrelation function directly from the simulation. Data from the autocorrelation function and the tracer diffusion coefficient of the mean squared displacement were used to calculate the ionic conductivity. The Green-Kubo formalism was employed to calculate the Onsager cross-coefficients (LAq and LqA). The results showed that the concentration of the dopant had a significant effect on both the thermotransport and the ionic conductivity. The results of this study demonstrated good agreement with the available experimental and theoretical data.