Synthesis and dielectric properties of Am−1Bi2BmO3m+3 ceramic ferroelectrics with m=1.5

Bismuth containing ceramic materials of molecular formula Bi5TiWNbO15, Bi5Ti1/2W1/2Nb2O15, Bi5Nb3O15 have been synthesised and fabricated. The materials are known as the Aurivillius phases. The Aurivillius phases are a family of oxide ferroelectrics generally formulated as Am−1Bi2BmO3m+3. The process of preparation was investigated by X-ray diffraction method as well as the simultaneous thermal analysis, in which both thermal (DTA) and mass change effects (TG) were measured on the same sample. The synthesis of the Aurivillius phases was carried out according to the solid state reaction from the conventional mixture of oxides (Nb2O5, WO3, Bi2O3, and TiO2). DTA and TG traces showing the synthesis effects have been recorded. Investigations of the crystalline structure, microstructure and basic dielectric properties were performed.