Influence of synthesis method on the properties of mixed Aurivillius phase Bi₅TiNbWO₁₅

The ceramic material Bi₅TiNbWO₁₅ (BTNW) was obtained and is characterized by a layered, Aurivillus type structure (MBLPO—mixed bismuth oxide layered perovskites) with m = 1.5. In order to optimize the production, BTNW was synthesized by two methods: synthesis of a mixture of simple oxides Bi₂O₃, Nb₂O₅, WO₃, TiO₂ and synthesis of a mixture of appropriate, layered Aurivillus type structures Bi₂WO₆ (m = 1) and Bi₃TiNbO₉ (m = 2). Synthesized solid solutions were consolidated with a conventional method. The crystal structure of Bi₂WO₆ and Bi₃TiNbO₉ Bi₅TiNbWO₁₅ was examined at room temperature with an X-ray diffraction method. Microstructure and chemical composition were analyzed. The authors analyzed the temperature—permittivity ɛ relationship for the ceramic with m = 1,5, which was obtained with two methods, as well as for m = 1 and m = 2.