Synthesis, Structure, and Properties of Sr1−1.5x–yBix+yФ0.5xMo1–yVyO4 and Sr1−1.5xBixФ0.5xMo1–yVyO4–d Solid Solutions

Abstract

The synthesis conditions, structure details, and electrical conductivity of cation- and anion-deficient scheelite-like solid solutions Sr_{1 − 1.5x – y}Bi_{x + y}Ф_0.5xMo_{1 – y}V_yO₄ and Sr_{1 − 1.5x}Bi_xФ_0.5xMo_{1 – y}V_yO_{4 – d}, where Ф is a cation vacancy, have been studied. The homogeneity ranges of solid solutions were determined, and their structural features were studied using a set of methods. The morphology of ceramic samples was studied by scanning electron microscopy. The total electrical conductivity of the compounds was measured by impedance spectroscopy in the temperature range 400–650°C. To estimate the contribution of the electron and proton components to the total electrical conductivity of solid solutions, the electrical conductivity characteristics were measured in a humid atmosphere and at various partial pressures of oxygen. The Arrhenius plots of the electrical conductivity were analyzed.