Interface-induced piezoelectricity in an unpoled Na0.5Bi0.5TiO3-based composite ceramic

Zhao, M. L.; Wang, L. H.; Wang, C. L.; Zhang, J. L.; Gai, Z. G.; Wang, C. M.; Li, J. C.
July 2009
Applied Physics Letters;7/13/2009, Vol. 95 Issue 2, p022904
Academic Journal
Composite ceramics containing Bi12TiO20 and Na0.5Bi0.5TiO3 grains were fabricated by an ordinary sintering technique. An anomalous piezoelectric response consistent with triclinic symmetry was found in unpoled samples and could be detected up to at least 765 °C. This piezoelectric effect appears concurrently with macroscopic cellular interfaces in as-sintered ceramics, suggesting that it may originate from an interface effect. Since these kinds of composites also have near-zero temperature coefficients of the resonance frequencies over the temperature range from 400 to 520 °C, they have potential as high-temperature piezoelectric materials.


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