Abstract
The low depolarization temperature has hindered implementation of (Na1/2Bi1/2)TiO3 (NBT)-based lead-free piezoceramics in practical application, in particular, in high temperature environment. In this work, the impact of Fe modification on the microstructure, depolarization temperature, ferroelectric and piezoelectric properties of 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 (NBT-6BT) lead-free ceramics were studied. The results illustrates that the piezoelectric constant and depolarization temperature can be significantly tuned by Fe doping, and more importantly, both can be simultaneously enhanced. Compared to the undoped material, the room-temperature piezoelectric constant of NBT-6BT with 1.0 mol% Fe doping increases from 133 pC/N to 164 pC/N, and the depolarization temperature increases from 106 °C to 125 °C. These observations are mainly attributed to the stabilization of ferroelectric order, induced by the enhanced lattice distortion.
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