(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 Ceramics Synthesized by a Gel-Casting Method

Abstract

(Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 (BCZT) powder was synthesized by a solid-state reaction method, then the ceramics were fabricated by gel-casting and diepressing routes, respectively. Piezoelectric coefficient (d 33 ) was measured by the d 33 m ; Planar mode electromechanical coupling coefficient (k p ), dielectric loss (tand) and relative permittivity (e r ) were measured by the impedance analyzer. Results of measurements showed that in the range of tested sintering temperature (1300-1500°C), gel-casting samples showed better piezoelectric and electromechanical coupling coefficients (d 33 = 395 pC/N, k p = 0.44) compared with die-pressing samples, and comparable dielectric properties were also observed. (tand = 0.037, e r = 3267).