倍半氧化物Y2O3作为三价镧系激活离子的激光基质晶体,具有良好的热、化学、光学和机械性能,是一种非常有前景的固态激光材料。但Y2O3熔融温度高达2430℃,且在2350℃时会发生立方相向六方相的多晶相变,两相不同的膨胀系数导致产生裂纹,使得Y2O3单晶很难用常规生长方法拉制。Y2O3 As the laser host crystal of trivalent lanthanide-activated ions, sesquioxide Y2O3 is a promising solid-state laser with good thermal, chemical, optical and mechanical properties. However, the melting temperature of Y2O3 is as high as 2430 ℃, and the polycrystalline phase transition from cubic phase to hexagonal phase occurs at 2350 ℃. The different expansion coefficients of two phases lead to cracks, making the Y2O3 single crystal hard to be drawn by conventional growth method. Y2O3