Abstract
A relaxor shows piezoelectricity with a DC bias electric field because of the field-induced ferroelectric phase transition. The piezoelectricity will disappear if the field is withdrawn. Surprisingly, in relaxor PbFe2/3W1/3O3, after a DC bias field cooling process, it shows piezoelectricity on heating at a particular temperature range without the DC bias field, which is the so-called piezoelectric memory effect. The electrical and structural investigations indicate that the memory effect is closely related to a local polar phase transition and the ‘softening’ of the lattice.
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