Abstract
In this work 0.015Pb(Sb1/2Nb1/2)O3–0.3Pb(Ni1/3Nb2/3)O3–0.685Pb(ZrxTi1−x)O3 (x=0.42–0.44) ceramics were prepared by a conventional mixed oxide method. The morphotropic phase boundary (MPB) of 0.015PSN–0.3PNN–0.685PZT ceramics with a variable Zr/Ti was investigated. The MPB composition (x=0.43) possessed high performances. The optimal electric properties of the specimen with Zr/Ti=43/57 were obtained by sintering for 2h at 1240°C: d33=643pC/N, Kp=0.67, ε33T/ε0=4349, tanδ=1.67%, Tc=229°C, Pr=33.53μC/cm2. Particularly, the specimen with MPB composition whose normalized strain Smax/Emax can extend up to 1613pm/V under a considerable low electric field (0.8kV/mm)exhibited a superior reversible strain of 0.258%, showing great potentials for large-displacement actuator applications.
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