Solid Electrolytes Based on Rubidium Monoaluminate
Doped with Four-Charged Cations

G. Sh. Shekhtman and E. I. Burmakin^z

Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences,
ul. S. Kovalevskoi 22, Yekaterinburg, 620990 Russia

Received June 26, 2014

Abstract—Solid electrolytes with rubidium-cation conductivity in the Rb_1–xAl_{1 – x}E_xO₂ (E = Si, Ti, Ge) sys-
tems are synthesized. Their phase composition, temperature and concentration dependences of conductivity are
studied. A high rubidium-cation conductivity (3 10^–3 S cm^–1 at 300C, 1.4 10^–2 S cm^–1 at 700C) is caused
by the formation of rubidium vacancies as a result of Rb⁺ + Al³⁺ E⁴⁺ + V_Rb substitution and stabilization of
disordered structure of -KAlO₂ type.

Keywords: solid electrolytes, rubidium-cation conductivity, rubidium monoaluminate

DOI: 10.1134/S1023193515050122

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