Abstract
Non-180° domain-switching induced strains in ferroelectrics, although much larger than piezoelectric strains, had been thought unusable as they are usually irreversible. Here, we show that under a uni-polar field of 800 V/mm with a prestress which depoles the material nearly completely, a reversible strain of 0.93% can be realized in a poled BaTiO3 crystal. Similarly, we realized an actuation strain of 0.66% in a tetragonal 0.62Pb(Mn1/3Nb2/3)O3-0.38PbTiO3 crystal at 1.8 kV/mm. The obtained large actuation strains are caused by reversible 90° domain-switching under electromechanical loading. Furthermore, the large strains are quite stable and have quick responses, very promising for practical actuator applications.
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