Influence of Pressure-Transmitting Media on the Lattice Vibration and Phase Transition Pressure-High Pressure Raman Spectra Studies of -Bi2O3

High pressure Raman spectra of -Bi2O3 were measured by using a 4∶1 methanol-ehanol mixture and solid argon as pressure-transmitting media respectively. The experimental results show that the shift rates of Raman lines in the sample are distinctly affected by the pressure-transmitting media. We firmly believed that -Bi2O3 probably undergoes a structural phase transition. The phase transition pressure are 23.1 GPa and 20.4 GPa under quasi-hydrostatic condition and nonhydrostatic condition respectively.