La2CaB10O19晶体生长体系熔体结构及其微观生长过程研究

La2CaB10O19(LCB)晶体具有适中的非线性光学效应和双折射、高的紫外透过率及激光损伤阈值，以及良好的物理化学稳定性，是一种具有潜在应用价值的非线性光学晶体材料。目前，LCB晶体生长存在的主要问题是生长体系粘度高，晶体沿c方向存在层状生长习性，不易生长出c向尺寸较大的晶体。本项目中，我们通过结合高温Raman光谱和理论计算研究LCB晶体助熔剂生长体系熔体的微观结构及晶体生长的微观过程揭示：（1）LCB晶体生长体系熔体微观结构及物化性质随温度的变化规律；（2）LCB晶体生长体系中助熔剂作用机制及其对体系粘度的影响规律；（3）LCB晶体生长过程中微观结构的演变，为优化LCB晶体生长提供理论支撑。

La2CaB10O19 (LCB) crystal possesses moderate nonlinear optical effect, affordable birefrigence, high transmission in UV region，high laser damage threshold and stable chemistry and physical properties, which is an potential NLO crystal material. Recently，the main problem of LCB crystal growth is the high viscosity and the small dimension along c direction. In this project, we study the micro-structure of LCB crystal growth system by combining high temperature Raman spectroscopy and theory calculation to explore (1) the development of the microstructures， physics and chemistry properties of LCB crystal growth system with temperature；(2) the function of fluxes and its effects to the viscosity of LCB crystal growth system; (3) the evolution of the microstructures in the growth microprocess, which provide theory supporting for optimizing crystal growth of LCB crystal.