Abstract
New high-conductivity solid electrolytes based on potassium monoaluminate and monoferrite are synthesized by partial substitution of V5+ for three-charged cations. In both systems, the introduction of vanadium cations leads to a substantial increase in the conductivity, with the maximum values corresponding to upper boundaries of the monophase solid solution regions. The principal factors responsible for the high conductivity are the formation of potassium vacancies at the substitutions M3+ → V5+ + 2V’K and the extension of the temperature range of existence of high-temperature modifications of KAl(Fe)O2.
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