Aging-induced giant recoverable electrostrain in Fe-doped 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystals

The aging effect of a 0.2mol% Fe-doped 0.62Pb(Mg1∕3Nb2∕3)O3–0.38PbTiO3 single crystal was investigated. The authors found that aging induced a double ferroelectric hysteresis loop and a giant recoverable electrostrain of 0.8% at an electric field of 1.2kV∕mm in the ⟨001⟩-oriented tetragonal crystal. This result is much higher than the strains obtained in crystals near the morphotropic phase boundary under the same field. Such aging effect is attributed to a point-defect-mediated reversible domain-switching mechanism. Large electrostrains (>0.55%) at 1.2kV∕mm for a broad temperature from room temperature to 160°C suggest that the aged single crystal is a promising electromechanical material.

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