Preparation and electrical properties of SrBi_(2)Ta_(2)O_(9) ceramic

摘要

SrBi_(2)Ta_(2)O_(9) (SBT) ceramic materials were prepared by the conventional mixed-oxide method. Ceramics sintered at different temperatures had distinctly different microstructures. Anisometric plate-like crystalline grains were observed which revealed the layered structure of the material. The variations of the saturation polarization (P_(s)), remanent polarization (P_(r)) and coercive field (E_(c)) with applied field and temperature were studied by hysteresis (P-E) loop measurements. Samples were also DC poled at various temperatures and electric fields, and their permittivity, piezoelectric (d_(33)) and pyroelectric coefficient (p) were measured.