The thermal conductivity, bulk modulus, thermal expansion and heat capacity for
bulk β-Ga2O3 are calculated from lattice
dynamics using both a quasi-harmonic approximation and an anharmonic
force-constant approach involving a solution of the linearized Boltzmann
transport equation. The role of anharmonicity in
β-Ga2O3 is determined to be small, which
leads to the weak volume dependence of the calculated thermal conductivity. The
negligible anharmonic contribution to the overall thermal conductivity is
consistent with both thermal expansion measurements and also with comparisons
between the quasi-harmonic and anharmonic methods. Phonon-mode-dependent
Grüneisen parameters are found to be weakly dependent on temperature.
Negative values of the mode Grüneisen parameters are found for certain
low energy optical modes, but their net effect on the overall thermal expansion
is insignificant. Bulk modulus as well as heat capacity are also given and found
to be in agreement with experimental results.