solid electrolytes

New potassium solid electrolytes in the systems K 3-2x M x PO 4 (M = Mg, Zn) were synthesized and studied. The introduction of Mg₂₊ and Zn₂₊ cations leads to sharp increasing of K 3 PO 4 conductivity due to potassium vacancies formation and stabilization of high temperature cubic modification of orthophosphate. Maximum conductivity is observed at x ≈ 0.15–0.25 and is equal to (6–8)·10_-2 S·cm_-1 at 400°C, higher than 10_-1 S·cm_-1 at 700°C. The factors influencing on the transport properties of investigated electrolytes are discussed.

New potassium solid electrolytes in the mixed gallate-ferrite systems K_0.85Pb_0.75(Ga_1-xFe_x)O₂ and K_1.85(Ga_1-xFe_x)_1.925V_0.75O₄ were synthesized and studied. In the both systems the monotonic increasing of conductivity with increasing of Fe³⁺ concentration takes place, anomalies as in the early investigated aluminate-ferrite systems does not fixed. Conductivities at the intermediate ranges of «x» have rather high values (> 10^-2 Cm·sm^-1 at 50°C, > 1 Cm·sm^-1 at 70°C), this allowes to optimize the composition of solid electrolytes at the relation of conductivity/stability properties.