Solid Electrolytes with Potassium Cation Conductivity
in K_12xM_xAlO₂ (M = Ba, Pb) Systems

E. I. Burmakin^z, G. V. Nechaev, and G. Sh. Shekhtman

Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 22, Ekaterinburg, 620219 Russia

Received December 12, 2007

Abstract—New solid electrolytes with high potassium cationic conductivity based on potassium monoalumi-
nate were synthesized and studied in the K_12xBa_xAlO₂ and K_12xPb_xAlO₂ systems. A partial substitution of
potassium cations with double charged positive cations results in a considerable increase in the conductivity of
KAlO₂ in the whole studied range of temperatures. The electric characteristics are somewhat higher in the barium-
containing system, which is in all probability connected with the effect of the size factor: the size of the Ba²⁺ ion
is higher than that of Pb²⁺, which must correlate with the increase of the effective dimensions of the migration
channels in the electrolyte structure. The main cause of the conductivity increase at the introduction of the studied
additives is the formation of potassium vacancies at the substitution of 2K⁺ Ba²⁺(Pb²⁺) +

Key words: potassium-conducting solid electrolytes, electric conductivity, potassium monoaluminate, Ba²⁺ and
Pb²⁺ additives

DOI: 10.1134/S1023193508120124

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