The structure and electrical properties of an A‐site‐deficient perovskite compound found in the La 2/3 TiO 3 ‐La 1/3 NbO 3 system were investigated. The composition of the perovskite compound seemed to be very close to La 0.633 (Ti 0.90 Nb 0.10 )O 3 . X‐ray diffraction analysis revealed a superstructure with a doubled c ‐axis parameter, resulting from an ordered arrangement of the A‐site cation vacancies. Impedance measurements on the compound showed that La 0.633 (Ti 0.90 Nb 0.10 )O 3 had high ionic conductivity at relatively low temperature (<770 K) and increased electronic conduction at high temperature (>770 K). The bulk ionic conductivity was comparable with that of La 0.683 (Ti 0.95 Al 0.05 )O 3 , which has the highest ionic conductivity among the La‐(Ti,Al)‐O perovskite compounds.
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Hideki Yoshioka (2002) studied this question.
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