High-Temperature Raman Investigation on Phase Transition of LBO Crystal

The high-temperature Raman spectroscopy technique is applied to investigate the phase transition of LiB₃O₅ crystal. The result shows that the crystal is stable in the range of 293-893K. When the temperature increases up to above 1107K, the phase transition occurs. In the liquid phase, Li₂B₄O₇ crystal precipitates out. Up to 1173K, the Li₂B₄O₇ crystal disappears in the melt.