Uranium substitution for tungsten in the Bi2WO6-Bi2UO6 system Formation of a broad high-temperature solid solution

被引：10

作者：

Charkin, Dmitri O. ^{[1
,2
]}

Lebedev, Dmitri N. ^{[2
]}

Stefanovich, Sergey Yu ^{[1
]}

Kazakov, Sergey M. ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia

[2] Moscow MV Lomonosov State Univ, Dept Mat Sci, Moscow 119991, Russia

来源：

SOLID STATE SCIENCES | 2010年 / 12卷 / 12期

关键词：

Bismuth tungsten oxide; Bismuth uranium oxide; Solid solution; Non linear optical activity; Crystal structure; OXIDE-ION CONDUCTIVITY; LAYERED STRUCTURES; BISMUTH; BI2WO6; PHASES;

D O I：

10.1016/j.solidstatesciences.2010.09.002

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Polythermic studies of Bi2WO6-Bi2UO6 system revealed existence of a broad Bi2W1-xUxO6 solid solution with the Aurivillius-type structure Below 750 degrees C the homogeneity area is narrow (x <= 0 12) but extends significantly at higher temperatures (up to ca 75% Bi2UO6 at 1025 degrees C) The solid solution retains orthorhombic symmetry over the entire compositional range but substitution of U for W results in significant lowering of second harmonic intensity and Curie point suggesting at high substitution degrees a very close approach to the archetypic body-centered tetragonal centrosymmetric structure The known Bi2WO6-based solid solutions are discussed in terms of thermal stability and a general geometrical explanation is suggested Incorporation of large cations into the B perovskitic positions of [Bi2O2][A(n-1)BnO(3n+1)] Aurivillius structures seems yet to be restricted by the n = 1 case (C) 2010 Elsevier Masson SAS All rights reserved

引用

页码：2079 / 2085

页数：7

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