New potassium-conducting solid electrolytes in the mixed alumoferrite system K0.90Ba0.05Al1-хFeхO were synthesized and studied. The effect of increasing conductivity with simultaneous presence of aluminium and ferrum cations has been established. The maximum conductivity in the system reaches very high values: – 6·10-2 S·cm-1 at 400°C, 2·10-1 S·cm-1 at 700°C. Possible nature of obtained results is discussed.
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