期刊
MONATSHEFTE FUR CHEMIE
卷 140, 期 9, 页码 1081-1094出版社
SPRINGER WIEN
DOI: 10.1007/s00706-009-0111-0
关键词
Electrochemistry; Ceramics; Charge transfer; Grain-boundary conduction; Intergranular phase
资金
- Korean government (MEST) [R0A-2008-000-20032-0]
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.
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