Size of defect clusters in lithium niobate single crystals

被引：0
|
作者：
He, XK
Xue, DF [1 ]
机构：
[1] Dalian Univ Technol, Sch Chem Engn, Dept Mat Sci & Chem Engn, State Key Lab Fine Chem, Dalian 116012, Peoples R China
[2] Dalian Univ Technol, Key Lab Micro Nano Technol & Syst Liaoning Prov, Dalian 116023, Peoples R China
来源：
JOURNAL OF RARE EARTHS | 2006年 / 24卷
关键词：
lithium niobate; defect cluster; defect size; bond valence model;
D O I：
暂无
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
On the basis of the Li-site vacancy model, the non-stoichiometric defects in LN crystals, i.e., anti-site defects Nb-Li and corresponding lithium vacancy defects V-Li, were investigated by the bond valence model. According to the valence sum rule, 4 V-Li sites must emerge in the nearest lattices of Nb-Li, and thus form a neutral cluster with the center, Nb-Li(V-Li)(4)Nb5O15. 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 similar to 1.2 nm in diameter.
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页码：253 / 256
页数：4
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