Piezoelectric Properties of Microwave-Sintered (Pb0.76Ca0.24)[(Co0.5W0.5)0.04Ti0.96]O3 Ceramics

摘要: In this paper, (Pb0.76Ca0.24)[(Co0.5W0.5)0.04Ti0.96]O3 (PCCWT) ceramics were prepared using a mixed oxide method and sintered by means of microwave sintering (MS) conventional (CS) techniques. The electrical properties PCCWT evaluated via an impedance/gain phase analyzer the corresponding microstructures examined scanning electron microscope (SEM). experimental results show that specimens CS process need 1200 ◦ C-2 hr to reach 95% relative density; however, MS required only 1150 C-15 min. Energy dispersion spectrum (EDS) data reveals loss PbO was significant in specimens, therefore excess added compensate nominal values. polarization-electrical field (P-E) also coercive fields (Ec) decrease with temperature; however remanent polarization (Pr ) increased temperature firstly then decreased later, indicating two competition mechanisms exist. X-ray diffraction indicates tetragonality decreases as increases, implying domain switchability is lower for specimen due larger tetragonality. For higher net smaller, although domains are easier switch. Result amount switching spontaneous value produces maximum at most suitable processing condition. Comparison electric properties, (1200 hr) 26.5 µC/cm 2 , 16.4 kV/cm electromechanical coupling coefficient (kt 0.52, which superior (1150 min) Pr = 21.1 Ec 18.9 kt 0.48, system appears be more difficult allocate condition sintering. Further discussion will made context.