0.37BF-0.31PMN-0.32PT: A superior piezo-/pyro-/ferro-electric ternary ceramic at MPB

摘要

near morphotropic phase boundary composition 0.37BF-0.31PMN-0.31PT has been synthesized using the conventional solid-state reaction method. Scanning electron microscopy revealed a dense microstructure of the ternary ceramic system. A high piezoelectric coefficient (d(33)* = 572 pm/V) was revealed from the displacement voltage curve (butterfly loop). An excellent pyroelectric response was displayed by the ceramic in the temperature range of 30-80 degrees C. Good saturated ferroelectric loops with good fatigue resistant characteristic and high value of remanent polarization (P-r = 60.62 mu C/cm(2)) and coercive field (E-c = 18.77 kV/cm) were obtained for the synthesized ceramic. Apart from the conventional method used for reporting the Pr value, which is normally larger than the practically usable (remanent) polarization component, true-remanent hysteresis task was used to isolate the non-remanent component and hence reveal the true-remanent component of polarization which was found to be similar to 80% that of the conventional P-r value suggesting low leakage contributions in the ternary ceramic system. Time-dependent compensated hysteresis task was performed to study the resistive-leakage nature of the ceramic, which is a frequency dependent parameter.