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

Darby, R. J. and Farnan, I. and Kumar, R. V. (2009) ΔThe effect of co-doping on the yttrium local environment and ionic conductivity of yttria-stabilised zirconia. Ionics, 15 (2). p. 183. ISSN 0947-7047 (Print) 1862-0760 (Online) DOI 10.1007/s11581-008-0250-z

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Official URL: http://dx.doi.org/10.1007/s11581-008-0250-z

Abstract

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.

Item Type: Article
Uncontrolled Keywords: 08AREP; IA57;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Ionics
Volume: 15
Page Range: p. 183
Identification Number: 10.1007/s11581-008-0250-z
Depositing User: Sarah Humbert
Date Deposited: 24 Apr 2009 11:48
Last Modified: 23 Jul 2013 09:54
URI: http://eprints.esc.cam.ac.uk/id/eprint/901

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