Preparation and properties of (Ba_(0.6)Sr_(0.4))Bi_2Ta_2O_9 ceramic

摘要

(Ba_(0.6)Sr_(0.4))Bi_2Ta_2O_9 (BSBT) ceramic materials with plate-like grains were prepared by the conventional mixed oxide method. The microstructures of BSBT ceramic sintered at different temperatures were studied. The variations of the saturation polarization (P_s), remanent polarization (P_r) and coercive field (E_c) with applied electric field and temperature were studied by hysteresis (D-E loop) measurements. The permittivities, piezoelectric and pyroelectric coefficients of BSBT ceramic poled at various electric fields and temperatures were measured.