Nechaev Grigorii Viktorovich RussiaYekaterinburg Institute of high-temperature Electrochemistry UB of RAS, 20, Akademicheskaya St., Yekaterinburg, 620990research associateN_gregory@mail.ru Author's articles New potassium-conducting solid electro-lytes in the mixed alumoferrite system K0.90Ba0.05Al1-xFexO2 Potassium ion conductivity in mixed gallate-ferrite solid electrolytes