Abstract
AbstractRecently, a new family of piezoelectric perovskite materials, PbHfO3‐PbTiO3‐Pb(Mg1/3Nb2/3)O3 (PHT‐PMN) ternary system was developed, possessing good piezoelectric properties and high Curie temperature near the morphotropic phase boundary (MPB). Nb2O5, as a donor dopant in the perovskite piezoelectric systems has been used to improve the dielectric and piezoelectric properties. In this work, the effect of Nb2O5 addition in the PHT‐PMN ternary system was reported. It was found that Nb doping led to the change of phase structure for the PHT‐PMN system. With the addition of Nb2O5 content, the ferroelectric polarization was reduced, while the electric‐field‐induced strain and hysteresis were enhanced significantly. In particular, the 0.2 wt% Nb2O5‐doped PHT‐PMN exhibited the optimum piezoelectric and electromechanical properties, with d33 and kp being on the order of 670 pC N−1 and of 71%, respectively.
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