Preparation and properties of (SrxPb1-x)TiO3 ceramics for high voltage capacitors

摘要

A novel processing method was employed to produce (SrxPb1-x)TiO3 ceramics for high voltage capacitors, based on the computer simulation of a shell-core and two-phase mixed structural model proposed. Two different calcined powders, each with a different Tc, were obtained by selecting two different values of x among 0.4 and 0.9. The powders were mixed at different weight percentages, ball-milled, spray-dried, pressed and sintered. The crystalline phases of the ceramics were identified by XRD. STEM studies of the ceramics were also employed. The temperature dependencies of the dielectric constant of the ceramic samples were measured. The following satisfactory dielectric properties were reached: epsilon(20 C) = 2000, D-20 C = 0.003, alpha(6) = -8% (-25 degrees C to +85 degrees C) and E(b) = 10 kV/mm (DC). This processing method has been applied in batch production, resulting in high quality ceramic capacitors.