Structures of nonlinear hexagonal boratotungstates Ln3BWO9 (Ln = La, Pr, Nd, Sm, Gd, Tb, Dy)

被引:12
|
作者
Krut'ko, V. A. [1 ]
Belik, A. A. [1 ]
Lysanova, G. V. [1 ]
机构
[1] Natl Inst Mat Sci, Int Ctr Young Scientists, Tsukuba, Ibaraki 30510044, Japan
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1134/S0036023606060064
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Polycrystalline boratotungstates of composition Ln(3)BWO(9) (Ln = Pr, Nd, Sm, Gd, Tb, Dy) are prepared by solid-phase synthesis and structurally studied. The structures are refined using the Rietveld method for hexagonal space group P6(3) (Z = 2). The boratotungstate structures are frameworks. The rare-earth cations in the structure are coordinated by an array of nine oxygen atoms (three oxygen atoms from borato groups BO3 and six from WO6 polyhedra). The nature of the optical nonlinearity in the hexagonal boratotungstates Ln(3)BWO(9) is a direct consequence of the acentricity of both the tungstate and the rare-earth polyhedra in the structure. Dimorphism is discovered in polycrystalline La3BWO9.
引用
收藏
页码:884 / 889
页数:6
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