Abstract
Perovskite ferroelectric ceramics with Tm (temperature corresponding to maximum dielectric permittivity ε′) around room temperature and high electrostrictive coefficient Q33 are of interest to the applications in high-precision actuators, since low-hysteresis/non-hysteresis and high strain response can be generated in these materials based on a purely electrostrictive effect. In this work, undoped Ba(Zr0.2Ti0.8)O3 (BZT) and La3+-doped Ba(Zr0.2Ti0.8)O3 (BLZT) lead-free ferroelectrics were synthesized by solid state reaction method. Their dielectric and ferroelectric properties were investigated systematically with an emphasis on electrostrictive effect. With respect to increase of La3+ content from 0 to 1%, the Tm of BLZT decreases from 44.5 °C to 14.6 °C, and the diffuseness degree γ increases from 1.814 to 1.993. A conductive mechanism, which is prominent in undoped BZT, is inhibited drastically by introducing the La3+ into BZT. A high electrostrictive strain of 0.08% and a low hysteresis η (<10%) are obtained simultaneously in x = 0.25% composition at room temperature. The Q33 ranges from 0.0377 m4/C2 and 0.0537 m4/C2. This work not only reports a high electrostrictive effect in BLZT ferroelectrics, but also provides BLZT ceramics with a potential application in high-precision actuators.
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