Highly resistive intergranular phases in solid electrolytes: an overview |
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Authors: | Jong-Heun Lee |
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Institution: | (1) Department of Materials Science and Engineering, Korea University, Seoul, 136-713, Korea |
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Abstract: | 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. |
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Keywords: | |
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