Research on dielectric and piezoelectric properties of Ta-doped 0.68Pb(Mg1/3Nb2/3)O3–0.32PbTiO3 ceramics

Pure perovskite 0.68Pb [Mg1/3(Nb(1−x)Tax)2/3]O3–0.32PbTiO3 (0.68PMNTa–0.32PT) ceramics were prepared by one-step calcination method using Mg(NO3)2 instead of MgO as starting chemical. The dielectric properties as a function of temperature and P–E and ε–E loops were investigated in this work. The Tm and Tc shift down for ∼13 °C with Ta addition. The εm with Ta-doping is higher than that without doping. Both of the diffusion phase transition and frequency dispersion are weak, but the relaxor feature with Ta-doping is more apparent than that without doping. Both of the values of Pr and Ec decrease with Ta addition, and the values of remnant and maximum strain increase with Ta-doping.