Correlation between grain-boundary character and electrical properties of cerium oxide ceramics

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Cerium oxide ceramics are a promising material as an electrolyte of intermediate temperature solid oxide fuel cell. However, cerium oxide brings about highly electronic conduction at high temperatures and the electronic conduction would be derived from grain boundaries. We then try to elucidate the correlation between electric properties at grain boundaries and grain-boundary character with 4 Probe SPM. 4 Probe SPM enabled us to estimate double Shottky barrier derived from a single grain boundary. The non-ohmic I-V profiles in the vicinity of grain boundaries would be varied according to grain boundary character.