Potassium-cationic conductivity in the mixed ferrite-aluminate solid electrolytes with five-charged cation additives

Abstract

New potassium-conducting solid electrolytes in the mixed ferrite-aluminate K1.80(Fe1 − xAlx)1.90V0.10O4 and K1.85(Fe1 − xAlx)1.925P0.075O4 are synthesized and studied. In the first system, the conductivity only slightly depends on the composition; therefore, the composition of solid electrolyte can be optimized with respect to the conductivity-stability characteristics. In the second system, extremes and considerable negative deviations from the additivity are observed in the conductivity isotherms. Possible reasons for this phenomenon are discussed.