The Solid Solutions Based on Lanthanum Manganite as the Cathod Materials for Bismuth-Containing Solid Electrolytes¹

Abstract—Substituted lanthanum manganites with the general composition La_{1 – x}Bi_xMn_{1 – y}Fe(Ni,Cu)_yO_{3 + δ} and unit cells in rhombohedral (space group (sp. gr.) R-3c) and/or orthorhombic (sp. gr. Pnma) symmetry are synthesized and attested. They are characterized by permanent excessive oxygen nonstoichiometry within a single structure type at room temperature, independent of the dopant concentration. These materials are adequately mechanically compatible with bismuth niobates. The interval of their chemical compatibility with bismuth-containing compounds is limited by 700–800°C. In this region, the conductivity of composites of substituted lanthanum manganites and bismuth-containing electrolytes is higher as compared with individual compounds. The use of individual manganites or their composites as the electrodes in cells with bismuth-containing electrolytes increases the total conductivity of the cells.