Size of Defect Clusters in Lithium Niobate Single Crystals  

作　　者：He Xiangke Xue Dongfeng 

机构地区：[1]State Key Laboratory of Fine Chemicals, Department of Materials Science and Chemical Engineering [2] School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China [3]Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian 116023, China State Key Laboratory of Fine Chemicals, Department of Materials Science and Chemical Engineering [4]Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian 116023, China

出　　处：《Journal of Rare Earths》2006年第z1期253-256,共4页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (20471012), Foundation for the Author of National Excellent Doctoral Dissertation of China (200322), the Research Fund for the Doctoral Program of Higher Education (20040141004) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry

摘　　要：On the basis of the Li-site vacancy model, the non-stoichiometric defects in LN crystals, i.e., anti-site defects NbLi and corresponding lithium vacancy defects VLi, were investigated by the bond valence model. According to the valence sum rule, 4 VLi sites must emerge in the nearest lattices of NbLi, and thus form a neutral cluster with the center, NbLi(VLi)4Nb5O15. The bond graph of the defect cluster was given, which reveals the ideal chemical bonding characteristics of defect clusters. Combining the possible configuration of defect clusters and the ideal bond lengths in the bond graph, the size of defect clusters in the LN crystallographic frame is estimated as 0.9～1.2 nm in diameter.

关 键 词：lithium NIOBATE DEFECT cluster DEFECT SIZE BOND VALENCE model 

分 类 号：O771[理学—晶体学]