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

被引：0
作者：
R. J. Darby
I. Farnan
R. V. Kumar
机构：
[1] University of Cambridge,Department of Materials Science & Metallurgy
[2] University of Cambridge,Department of Earth Sciences
来源：
Ionics | 2009年 / 15卷
关键词：
Co-doping; Stabilised zirconia; Ordering;
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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 89Y nuclear magnetic resonance. The effect on the low-temperature (below 320 °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.
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