Abstract
Electrical properties of an apatite-type oxide ionic conductor, lanthanide silicates (Ln9.33+xSi6O26+1.5x, LnSO; Ln = La or Nd) which are expected as novel solid electrolytes for the intermediate-temperature solid oxide fuel cell (IT-SOFC) have been investigated in detail. Its total electrical conductivity was almost P(O2)-independent, while a slight dependence of the conductivity on P(O2) was observed under high P(O2) conditions at high temperatures. The conductivity for La10Si6O27 was much higher than that for Nd10Si6O27. This was probably due to a difference in an accepting capacity of excess oxide ions. The excess oxide ions, formed by introducing the excess Ln elements (x), play an important part in oxide ion conduction. In the case of Ln = Nd system, formation of the excess oxide ions was blocked probably due to its smaller lattice volume than that of Ln = La system.
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