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Bulk polycrystalline piezoelectric ceramics are extensively used in wideranging applications as actuators, transducers, and sensors. For actuatorapplications, it is desirable that the piezoelectric ceramic gives as largeelectric field driven unipolar strain as possible. In recent years there is anincreasing interest in the design and development of such piezoceramicmaterials. Here we show that piezoceramic discs (10 mm diameter) of PZT,BaTiO3-based and Na0.5Bi0.5TiO3-based polycrystalline piezoceramics can showvery large unipolar strain 2 to 3 % when the thickness of the discs is reducedto 200 microns or below. This is accompanied by increasing asymmetry in thebipolar strain-field loops. The motivation of this brief report is make theresearch community aware of this important effect in piezoceramics andencourage discussion/research on the this interesting phenomenon, which isapplicable to all piezoceramics.

Ultrahigh measured unipolar strain greater than 2 % in polycrystalline bulk piezoceramics: Effects of disc dimension