Pure and superstoichiometric modified by 2 wt.%Bi_(2)O_(3) and 2 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 b...Pure and superstoichiometric modified by 2 wt.%Bi_(2)O_(3) and 2 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 d_(33) and also resulted in a decrease in the dielectric loss tangent.The highest piezoelectric coefficient d_(33)=105 pC/N was obtained.Dielectric characteristics of ceramics revealed feroelectric relaxor behavior and region of diffuse phase transition from the paraelectric to ferroelectric phase in the temperature range of 740-770 K.展开更多
基金financial support of the Ministry of Science and Higher Education of the Russian Federation(State task in the field of scientific activity.Project No.FENW-2023-0010/GZ0110/23-11-IF)。
文摘Pure and superstoichiometric modified by 2 wt.%Bi_(2)O_(3) and 2 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 d_(33) and also resulted in a decrease in the dielectric loss tangent.The highest piezoelectric coefficient d_(33)=105 pC/N was obtained.Dielectric characteristics of ceramics revealed feroelectric relaxor behavior and region of diffuse phase transition from the paraelectric to ferroelectric phase in the temperature range of 740-770 K.
