Highly resistive intergranular phases in solid electrolytes: An overview

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Abstract

The siliceous intergranular phase in acceptor-doped zirconia and ceria and its effect on the ionic conduction across the grain boundaries were reviewed. Not only the abundant siliceous intergranular liquid phase, but also the monolayer-level siliceous intergranular segregation significantly deteriorates the grain-boundary conduction. To decrease the harmful effect of the resistive siliceous phase at the grain boundary, 'additive scavenging' or 'precursor scavenging' can be employed. The former involves the addition of a secondary phase or another acceptor material with a very high chemical affinity for the siliceous phase, while the latter involves the intergranular phase changing from having a continuous (blocking) configuration to having a discrete (non-blocking) configuration. The mechanisms of various scavenging reactions have been explained, compared, and discussed.

Original languageEnglish
Pages (from-to)1081-1094
Number of pages14
JournalMonatshefte fur Chemie
Volume140
Issue number9
DOIs
Publication statusPublished - 2009 Sep 1

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Keywords

  • Ceramics
  • Charge transfer
  • Electrochemistry
  • Grain-boundary conduction
  • Intergranular phase

ASJC Scopus subject areas

  • Chemistry(all)

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