Abstract
Dense solid electrolytes based on lanthanum silicate, La 10Si 6O 27 (LSO) were fabricated and their electrical conducting properties were studied in detail under various atmospheres, including H 2O- or D 2O-humidified argon. The family showed almost P(O 2)-independent conductivity, while a slight increase in conductivity with increasing P(O 2) was observed in the high temperature region. The ionic transport number evaluated from the O 2/Ar oxygen concentration cell was higher than 0.964 at 1073–1273 K. The current–voltage characteristic of the fuel cell employing the dense LSO electrolyte was also investigated.
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