高温溶液中KTP晶体生长机制的研究

The Growth Mechanism of the KTP Crystal in a High Temperature Solution

采用激光Ｒａｍａｎ光谱，研究了ＫＴＰ－Ｋ_２Ｏ－Ｐ_２Ｏ_５和ＫＴＰ－Ｋ_２Ｏ－Ｐ_２Ｏ_５－ＷＯ_３两种不同溶液的淬冷玻璃体，这些玻璃体部分地记录了相应溶液的溶质与溶剂间相互作用的信息，溶液中ＴｉＯ_６、ＰＯ_４、ＷＯ_４等阴离子基团形成了不同类型的溶剂合物。随后，以籽晶称重法测定了ＫＴＰ晶体在这两种不同溶液体系中的生长质量速度与溶液过饱和度之间的关系。实验结果表明，ＫＴＰ晶体生长机制与原子化的ＢＣＦ生长理论的面扩散或体扩散的线性定律与抛物线定律相吻合。

The quenching glass of a KTP-K2O-P2O5 or KTP-K2O-P2O5-WO3solution system has been studied by means of the laser Raman Spectrum. It can partly record the data from the interaction between the solvent and the solute in the solution. The experiment shows that the anion group, TiO6, PO4, WO4 and so on,can form solvates of different types in the solution. Afterwards, the relationship between the growing velocity (of mass) of the KTP crystal and the super-saturation of the solution is measured using the small seed crystal weighing method. The experimental results show that the growth mechanism of the KTP crystal coincides with the linear law and the law of the parabola of surface or volume diffusion of the BCF atomic growth theory.