非线性光学晶体δ-LiZnPO_4的制备、结构及光学性能  

Synthesis,Structure Characterization and Optical Property of Nonlinear Optical Crystal δ-LiZnPO_4

作　　者：焦志伟[1] 汪海军[1] 朱广伟[1] 孙同庆[2] 崔岩[1] 刘峰斌[1] 屈敏[1] 

机构地区：[1]北方工业大学机械与材料工程学院,北京100144 [2]南开大学物理学院,天津300071

出　　处：《人工晶体学报》2017年第7期1197-1202,共6页Journal of Synthetic Crystals

基　　金：北京市教委面上项目(KM201610009005);北京市优秀青年骨干计划(2014000020124G009)

摘　　要：研究了LiF为助熔剂体系下的δ-LiZnPO_4的结晶特性,通过自发结晶得到了尺寸为1~3 mm的透明块状δ-LiZnPO_4和Li_4Zn(PO_4)_2共晶体,通过PXRD衍射分析和元素分析确定了共晶体的相组成,并对从共晶体中分离出的δ-LiZnPO_4晶体结构进行了分析。结果表明:δ-LiZnPO_4晶体具有非中心对称结构,属于正交晶系,空间群为Pna2_1,晶格常数a=1.00085 nm,b=0.49390 nm,c=0.66545 nm,Z=4;δ-LiZnPO_4是由PO_4、ZnO_4和LiO_4四面体构筑成的具有类似ABW型分子筛结构的化合物。采用水热法制备了尺寸约为10μm的纯相透明的δ-LiZnPO_4晶体。粉末倍频测试表明,δ-LiZnPO_4晶体倍频效应约为KDP的1.7倍,紫外截止边约为218 nm,是一种有潜在应用价值的紫外非线性光学晶体。Crystalline characteristic of δ-LiZnPO_4 was studied under using LiF as flux system. Transparent eutectic crystallization of δ-LiZnPO_4 and Li_4Zn（ PO_4）_2 with size of 1-3 mm was obtained by spontaneous crystallization method. Eutectic phase composition was determined via X-ray diffraction and element analysis,and structure of δ-LiZnPO_4 crystal separated from the eutectic crystal was analyzed. The results show that the δ-LiZnPO_4 crystals have a non-centerosymmetrical structure,belong to the orthogonal crystal system,space group Pna2_1 with lattice parameter a = 1. 00085 nm,b = 0. 93900 nm,c = 0. 66545 nm,Z = 4. Structure analysis confirms that the crystal consists of PO_4,ZnO_4 and LiO_4 tetrahedron to form a zeolite structure type of ABW. The transparent pure phase δ-LiZnPO_4 single crystal with size of about 10 μm was also synthesized by hydrothermal method. Powder second harmonic generation（ SHG）tests show that the powder SHG effect of δ-LiZnPO_4 crystal is about 1. 7 times of KDP and the ultraviolet（ UV） cut-off wavelength of δ-LiZnPO_4 crystal is 218 nm,which indicate that δ-LiZnPO_4 crystal is a promising nonlinear optical crystal in the UV region.

关 键 词：磷酸锂锌晶体 晶体结构 水热法 非线性光学晶体 

分 类 号：O78[理学—晶体学]