Abstract
(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT) powder was synthesized by a solid-state reaction method, then the ceramics were fabricated by gel-casting and die-pressing routes, respectively. Piezoelectric coefficient (d33) was measured by the d33 m; Planar mode electromechanical coupling coefficient (kp), dielectric loss (tanδ) and relative permittivity (er) 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 (d33 = 395 pC/N, kp = 0.44) compared with die-pressing samples, and comparable dielectric properties were also observed. (tanδ = 0.037, er = 3267).
Highlights
Lead zirconate titanate (PZT) has been the most successful piezoelectric ceramic for decades
Featured peaks of BCZT are labeled with the Miller index, and impurity peaks that are identified in the x-ray diffraction (XRD) pattern of the 1250°C-calcined powder were marked with black lines
It is notable that there are no impurity peaks identified in the XRD patterns of any sintered ceramics, implying that the impurity phases were eliminated during sintering and a pure perovskite structure was formed
Summary
Lead zirconate titanate (PZT) has been the most successful piezoelectric ceramic for decades. The moulds containing the cast samples were dried at room temperature for 24 h and dried in an oven at 40°C for 24 h to achieve BCZT green bodies They were put in a furnace to go through the same sintering profile as die-pressing samples. The sintered samples of both fabrication routes were coated with gold as electrodes on their plain surfaces and poled in a silicon oil bath with an applied electric field of 3kv/mm at room temperature for 10 min, and their piezoelectric and dielectric properties were measured 24 h after poling. Capacitance, relative permittivity (er) and dielectric loss (tand) values were measured by using the Agilent 4294A impedance analyzer (Agilent Ltd, UK)
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