The Thermal Conductivity Tensor of β‐Ga2O3 from 300 to 1275 K

Abstract

AbstractLaser‐flash measurements of the thermal conductivity of Czochralski‐grown β‐Ga2O3 single crystals are reported perpendicular to four independent crystallographic lattice planes , (010), (001), and (100) between room temperature and 1200 K. λ is represented by a symmetric tensor of rank 2 and has four independent components. Tensor components W m−1 K−1 and W m−1 K−1 (values for 300 K) can be directly measured. W m−1 K−1 and W m−1 K−1, instead, are obtained by combining W m−1 K and W m−1 K. The crystallographic ‐axis is the direction with the highest thermal conductivity, λ22. The thermal conductivity assumes its lowest value (11.73 W m−1 K−1) in a direction close to the crystallographic ‐axis. However, this direction does not coincide with , and changes with temperature.