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Abstract
Investigations of the frequency dependence of the P-E (polarization vs. field) and ε-E (strain VS. field) behavior have been performed on soft 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 polycrystalline ferroelectrics at various maximum field strengths below and above that of the coercive field (Ec). For E<Ec, a strong relaxational polarization was observed. At low frequencies, in this field range, P-E curves indicative of polarization switching were observed with an apparent remanence, however at higher frequencies near-linear P-E behavior was found.