Polycation Perovskites in System Ba₂Y₂O₅–BaCuO₂–BaMoO₄–BaTiO₃

To maintain the single-phase nature of the cubic solid solution Ba₂(Y, Cu, Mo)₂O₆, which is prone to polymorphism, titanium oxide was used. As a result of the synthesis by gel burning, annealing at 1000°C, and subsequent cooling in an inertial thermal mode, the cubic modification F \(\bar {4}\) 3m of Ba₅Y₂CuMoTiO₁₄ was obtained for the first time without an admixture of perovskite Fm3m. A comparative study of samples Ba₄Y₂CuMoO₁₁ and Ba₅Y₂CuMoTiO₁₄ was carried out using X-ray powder diffraction, X-ray fluorescence spectrometry, IR spectroscopy, and diffuse reflectance spectroscopy.