Synthesis, Structure, and Properties of La0.9Sr0.05Bi0.05Mn1 – yNiyO3 and Composites on Its Basis

Resumo

The solid solution La_0.9Sr_0.05Bi_0.05Mn_{1 – y}Ni_yO₃ (y = 0.0–1.0) was obtained for the first time using the solid-phase method and studied. It has been found that the solid solution (y = 0.1–0.3) with a rhombo-hedral structure (space group R3̅c) can exist at temperatures higher that 493 K. At room temperature, only La_0.9Sr_0.05Bi_0.05MnO₃ is a single phase. The studied complex oxides are chemically inert with respect to a bismuth-containing electrolyte based on Bi₃Nb_{1 – y}Er_yO_{7 – δ}up to 973 K. The use of composite electrode materials La_0.9Sr_0.05Bi_0.05Mn_0.7Ni_0.3O₃: Bi₃Nb_0.6Er_0.4O_{7 – δ}(1: 1 wt %) leads to an increase in the values of electroconductivity of an electrochemical cell containing the solid electrolyte based on bismuth niobate in comparison with the La_0.9Sr_0.05Bi_0.05Mn_0.7Ni_0.3O₃ electrodes.