Abstract
Dense solid electrolytes based on lanthanum silicate, La9.33+xSi6O26+1.5x (LSO, x = -0.33, 0.00, 0.34, 0.67, 1.00 and 1.34 on the weighed basis) were fabricated and their phase relations and electrical conducting properties were studied. The total conductivity (σ) increased monotonously with x up to x = 0.67, and the σ of the weighed composition, La10Si6O27 (x = 0.67), whose real composition was La9.69Si6O26.54 (x' = 0.36), was the highest (7.4×103 S•cm1 at 873 K) though it was not in a single phase region. This specimen showed almost P(O2)-independent conductivity, while a slight increase in conductivity with increasing P(O2) was observed in the high temperature region. The current-voltage characteristic of a fuel cell utilizing the dense LSO electrolyte was also investigated employing metal or mixed conducting electrodes.
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