Abstract
Longitudinal electrostrictive strains in an as-sintered and two annealed (0.4)Pb(In1/2Nb1/2)O3 : (0.6)Pb(Mg1/3Nb2/3)O3 relaxor ceramics were measured by laser-interferometry. The field-related electrostriction coefficients (M33) of the ceramics were then determined. The electrostrictive coefficients progressively decreased with annealing and the strain responses became nonlinear. The ferroelectric hysteresis loops of the as-sintered and annealed ceramics showed progressive decrease in coercive fields and maximum polarizations with increasing annealing time. Transmission electron microscopy studies revealed enlargement of 1 : 1 B-site ordered domains with annealing. The changes in the high-field responses of the annealed ceramics are interpreted as arising from a higher degree of long-range order caused by annealing. A field-induced mechanism is proposed to explain the correlation between the B-site cation long-range order and the electrostrictive behaviour in this relaxor.
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