Abstract
The structural, dielectric, ferroelectric, strain properties of (0.89−x)Bi(Mg0.5Ti0.5)O3–xPbTiO3–0.11CaZrO3 ceramics (x=0.45–0.55) were investigated. A morphotropic phase boundary between rhombohedral relaxor and tetragonal normal ferroelectric phases was identified in the composition range of 0.49<x<0.51. Moreover, a phase transition from ergodic to nonergodic relaxor states was noticed in the composition range of 0.45<x<0.51 with increasing the PbTiO3 content, during which a giant electric field induced strain (∼0.32%, d33*∼640pm/V) was observed in the proximity of x=0.48. Such a giant strain is believed to originate from the field induced reversible phase transformation between ergodic relaxor and the long-range ferroelectric phase and this was further confirmed by the measurements of the temperature-dependent ferroelectric polarization/strain loops.
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