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Effect of electric field on the shape-memory effect in Pb[(Mg1/3Nb2/3)0.70Ti0.30]O3 ceramic

The shape-memory effect (SME) is demonstrated to occur for the solid solution of lead magnesium niobate with lead titanate for the molar ratio 70:30. Since the material is an insulator, it was possible to apply an electric field to influence and investigate the SME. It is shown that electric field can be used for enhancing the shape strain produced by the bending load, although some fraction of the shape strain becomes irrecoverable on repeated SME cycling under the combined effects of mechanical and electric loads. An explanation is offered for this and other observations, invoking the relaxor-ferroelectric nature of the ceramic. Such materials have potential for use as ‘actuators with a memory’ in smart structures.