Abstract: In-situ high-pressure Raman study of β-Ga₂O₃ was carried out from 0 to 23.4 GPa with a diamond anvil cell (DAC). The authors determined the pressure dependences of the Raman bands of β-Ga₂O₃. The external vibrational modes at 144 cm^{-1 and 169 cm-1 were assigned according to the high-pressure Raman spectra. Two new Raman peaks at 232 cm-1 and 483 cm-1 are near 18 GPa, and their intensity is strengthened with increasing pressure. So we can determine the occurrence of pressure-induced phase transition near 18 GPa.}

Key words: β-Ga₂O₃, Raman spectrum, high pressure phase transition, diamond anvil cell (DAC)