Structure, dielectric and piezoelectric characteristics of the modified by Bi₂O₃ and Mn₂O₃ oxides binary BiFeO₃-BaTiO₃ ceramics

Pure and superstoichiometric modified by 2[Formula: see text]wt.% Bi 2 O 3 and 2[Formula: see text]wt.% manganese oxide (Mn 2 O 3 ) ceramic samples of the binary system 0.71BiFeO 3 -0.29BaTiO 3 were fabricated using conventional ceramic technology by double solid-phase synthesis with following sintering. Mechanical activation of synthesized powders was carried out at the stage of manufacturing press powders prepared for sintering. X-ray analysis at room temperature showed that all studied ceramics have pseudo-cubic symmetry. Grain morphology, dielectric and piezoelectric properties of selected solid solutions were investigated. The modification increased the homogeneity of the material, dielectric constant and piezomodulus [Formula: see text] and also resulted in a decrease in the dielectric loss tangent. The highest piezoelectric coefficient [Formula: see text] [Formula: see text]pC/N was obtained. Dielectric characteristics of ceramics revealed ferroelectric relaxor behavior and region of diffuse phase transition from the paraelectric to ferroelectric phase in the temperature range of 740–770[Formula: see text]K.