摘要
本文合成了一系列的(K,Na)3La2(BO3)3硼酸盐,通过自发结晶得到了组分为K1.34,Na1.66La2(BO3)3的单晶。单晶X射线结构分析表明该晶体与Na3La2(BO3)3同构,并且当K+取代Na+的数量小于2/3时,晶体结构仍为Na3La2(BO3)3构型。该晶体的基本结构单元为孤立的(BO3)3-基团。一个单胞中含有6个BO3基团,其中两个沿c方向一致平行排列,而剩余的4个BO3基团的排列方向与c方向呈一定的角度,从而减小了BO3基团对非线性效应的贡献。粉末倍频测试该晶体的有效非线性系数约为KDP的2.4倍。此外,研究表明用适量的Rb+,Li+取代Na+时,固溶晶体结构也不发生改变。
A series of potassium sodium lanthanum borates(K,Na)3La2(BO3)3 have been synthesized.Single crystals with approximate composition of K1.34Na1.66La2(BO3)3 have been grown by the spontaneous nucleation.The results indicated that when less than two thirds of Na+ were substituted by K+,the title compound maintains the structure of the end member Na3La2(BO3)3.The structure unit in the structure is the isolated(BO3)3-group.Among the six BO3 groups in the unit cell,two of them are exact aligned whereas four remaining ones incline with an angle to the c direction,which significantly reduce their contribution to the nonlinear optical coefficients.The effective SHG coefficient of this crystal is 2.4 times of KDP cystal.Other substitutions with Rb+,Li+ were attempted,which showed all forming solid solutions with the same structure.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第5期815-818,共4页
Journal of Synthetic Crystals
基金
National Natural Science Foundation of China(90922036
4/E0201)
