Phase structure evolution and electric properties of PSN-PIN-PT ferroelectric ceramics near MPB

In order to explore the ceramic composition in the morphotropic phase boundary suitable for the high temperature electronic components, Pb(Sc_1/2Nb_1/2)O₃-Pb(In_1/2Nb_1/2)O₃-PbTiO₃(PSN-PIN-PT) ceramics were designed and prepared by using the solid-state reaction method. Effect of the ceramic composition on the phase structure and electric properties of the PSN-PIN-PT ceramics were investigated. For 0.40PSN-(0.60-x)PIN-xPT(x = 0.360, 0.375, 0.390, 0.405), the increase in the PT could improve gradually Curie temperature T_c (262–292°C), but will reduce the phase transition T_R-T (94–181 °C). Maximum of piezoelectric coefficient d₃₃ (578 pC/N) could be obtained in the 0.40PSN-0.21PIN-0.39PT ceramics, together with large residual polarization P_r (~36.7 µC/cm²) and high coercive field E_c (~9.3 kV/cm). These performances make the PSN-PIN-PT ceramics have great potential applications in the high temperature device.