Chiang Mai Journal of Science

PMN-PZT ceramic composition near the morphotropic phase boundary (MPB) with formula 0.1Pb (Mg1/3Nb_2/3)O₃ -0.9Pb(Zr_0.5Ti_0.5)O₃ or 0.1PMN-0.9PZT is prepared by a conventional mixed-oxide method. The hysteresis properties are investigated as a function of poling field strength by a simple Sawyer-Tower circuit. It is found that the shape of the hysteresis loops does not change significantly with the poling field strength. However, the remanent polarization (P_r) and spontaneous polarization (P_s) values increase with increasing the poling field strength because an increase in a DC poling field magnitude re-orients more domains with the poling field direction, while the coercive field (E_c) is relatively constant and its value indicates a minimum field required to cancel all the polarizations.