Cooperative transport in oxides: Diffusion and migration processes involving Mo(VI), W(VI), V(V) and Nb(V)

被引：57

作者：

Neiman, AY

机构：

[1] Chemical Department, Ural State University

来源：

SOLID STATE IONICS | 1996年 / 83卷 / 3-4期

关键词：

crawling; diffusion; defect centres; polyvalent metals;

D O I：

10.1016/0167-2738(95)00247-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The model explaining the phenomenon of polyvalent metal's high mobility in complex compounds have been analyzed on the basis of principal role of covalency, high energy and easy polarizability of metal-oxygen bonds. The transfer of V, Nb, Mo and W may be considered as a crawling due to rearrangement of these bonds. The transfer is facilitated in the presence of pyramidal defect centres of the type [WO3Vo](0) or [NbO3Vo](-) and is promoted by their potential ability to shape-invertion and conformational changes. In polycrystals an important role belongs to MoO3-, WO3- and V2O5-based mobile adsorbed phases at the grain boundaries.

引用

页码：263 / 273

页数：11

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