Study of twisting of β-Ga2O3 crystals based on optical absorption and thermal conductivity anisotropy in the crystals grown by the Czochralski method

•The effects of internal radiation in β-gallium oxide crystals were numerically studied.•Temperature gradient in the semitransparent crystal was simulated.•The convex interface shape was calculated.•The almost flat shape between an opaque crystal and the melt was calculated.