Optical Properties and Thermal Stability of a Cubic Sulfate Rb_(2)Ca_(2)(SO_(4))_(3)  

作　　者：ZHONG Xiao-Yu WU En-Qiang YANG Sheng-Dong WANG Hao-Hang LIN Xiao-Xin SHEN Yao-Guo 钟晓钰;吴恩强;杨生东;王昊航;林小馨;沈耀国(College of Physics&Electronic Information Engineering,Minjiang University,Fuzhou 350108,China)

机构地区：[1]College of Physics&Electronic Information Engineering,Minjiang University,Fuzhou 350108,China

出　　处：《Chinese Journal of Structural Chemistry》2021年第7期949-954,841,共7页结构化学（英文）

基　　金：the Doctoral Fund(MJY19014);Natural Science Foundation of Fujian Province(2019J01762);President's Fund(103952020020)。

摘　　要：In this paper,a non-centrosymmetric compound of Rb_(2)Ca_(2)(SO_(4))_(3)has been synthesized by a high temperature solid-state reaction and high temperature melting method.Single-crystal X-ray diffraction analysis shows that Rb_(2)Ca_(2)(SO_(4))_(3)crystallizes in the cubic space group of P2_(1)3,and its cell parameters are a=b=c=10.5569(6)Å,Z=4 and V=1176.55(12)Å^(3),respectively.In the crystal structure,SO4 tetrahedra and CaO6 octahedra are connected with each other by a corner-sharing mode to construct the three-dimensional framework of Rb_(2)Ca_(2)(SO_(4))_(3).Optical measurements show that the title compound has a short ultraviolet absorption edge and a moderate second-harmonic generation response.The optical origin is illustrated by the electron band structure calculation.In addition,thermal stability is also studied by virtue of differential thermal/thermogravimetric analysis and powder XRD technique.

关 键 词：crystal structure nonlinear optics solid-state reaction SULFATE 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ131.14[化学工程—无机化工]