Crystal growth of β-Ga2O3 by electric current heating method

Beta gallium oxide (β-Ga2O3) ceramic bars were heated by electric current under various ambient pressures. In atmospheric pressure, few crystals grew on the rod. In vacuum chamber (6.7×10−3 Pa), on the other hand, aggregated crystals were grown on the rod. The typical size of the aggregated crystal was approximately 50 μm. Whiskers of β-Ga2O3 were grown near the platinum electrodes and their diameter decreased with decreasing pressure. From the results, vacuum condition is considered to be an important factor for β-Ga2O3 crystal growth by electric current heating method.