ΔThe effect of co-doping on the yttrium local environment and ionic conductivity of yttria-stabilised zirconia

被引：5
|
作者：
Darby, R. J. [1 ]
Farnan, I. [2 ]
Kumar, R. V. [1 ]
机构：
[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
[2] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England
来源：
IONICS | 2009年 / 15卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
Co-doping; Stabilised zirconia; Ordering; SYSTEM; MICROSTRUCTURE; ELECTROLYTES;
D O I：
10.1007/s11581-008-0250-z
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 effect of co-doping yttria-stabilised zirconia with calcia and scandia has been investigated. Changes in the yttrium ion local environment have been monitored using solid-state magic angle sample spinning Y-89 nuclear magnetic resonance. The effect on the low-temperature (below 320 A degrees C) bulk ionic conductivity has been observed using AC impedance spectroscopy. It was found that the number of oxygen vacancies in the nearest-neighbour sites to yttrium ions decreased on co-doping with scandia, correlating with an increase in conductivity, but increased on co-doping with calcia, correlating with a decrease in conductivity. This behaviour can be explained by proposing the trapping of oxygen vacancies in the nearest-neighbour yttrium ion sites so that they no longer contribute to the conduction mechanism.
引用
收藏
页码：183 / 190
页数：8
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