17O MAS NMR study of the oxygen local environments in the anionic conductors Y2(B1-xB′x)2O7(B, B′ = Sn, Ti, Zr)

被引：38

作者：

Kim, N ^{[1
]}

Grey, CP ^{[1
]}

机构：

[1] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2003年 / 175卷 / 01期

关键词：

solid state NMR; oxide ionic conductor; pyrochlore; fluorite; Y2Zr2O7; Y2Sn2O7; Y2Ti2O7;

D O I：

10.1016/S0022-4596(03)00290-1

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The local environments for oxygen in yttrium-containing pyrochlores and fluorites, Y-2(B1-xB'(x))(2)O-7 (B = Ti, B-' = Sn, Zr) are investigated by using solid state O-17 MAS NMR spectroscopy. The quadrupolar coupling constants of the I = (2)/(5) nucleus, O-17 are sufficiently small for these ionic oxides, that high-resolution spectra are obtained from the MAS spectra. Different oxygen NMR resonances are observed due to local environments with differing numbers of metal cations (Y3+, Sn4+, Ti4+ and Zr4+), allowing the numbers of different local environments to be quantified and cation mixing to be investigated. Evidence for pyrochlore-like local ordering is detected for Y2Zr2O7, which nominally adopts the fluorite structure. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：110 / 115

页数：6

共 29 条

[1] High-temperature O-17 NMR as a probe of electron localization and structure in transition metal oxides [J].