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Issue 27, 2016
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Temperature dependent structures and properties of Bi0.5Na0.5TiO3-based lead free piezoelectric composite

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Abstract

The thermal depolarization around 100 °C of the Bi0.5Na0.5TiO3-based piezoelectric solid solutions leads to the disappearance of macroscopic ferroelectric/piezoelectric properties and remains a long-standing obstacle for their actual applications. In this communication, we report lead-free piezoelectric composites of 0.94Bi0.5Na0.5TiO3-0.06BaTiO3:0.5ZnO (BNT-6BT:0.5ZnO, where 0.5 is the mole ratio of ZnO to BNT-6BT) with deferred thermal depolarization, which is experimentally confirmed by systematic temperature dependent dielectric, ferroelectric, piezoelectric measurements. Especially, based on temperature dependent X-ray diffraction measurements on unpoled and poled samples, thermal depolarization is confirmed to have no relationship with the structural phase transition, the possible mechanism for the deferred thermal depolarization is correlated with the ZnO-induced local electric field which can suppress the depolarization field. We believe our results may be helpful for understanding the origin of thermal depolarization in BNT-based piezoelectric materials, and thus provide an effective way to overcoming this obstacle.

Graphical abstract: Temperature dependent structures and properties of Bi0.5Na0.5TiO3-based lead free piezoelectric composite

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Article information


Submitted
12 May 2016
Accepted
15 Jun 2016
First published
15 Jun 2016

Dalton Trans., 2016,45, 10891-10896
Article type
Communication

Temperature dependent structures and properties of Bi0.5Na0.5TiO3-based lead free piezoelectric composite

J. Zhang, L. Sun, X. Geng, B. Zhang, G. Yuan and S. Zhang, Dalton Trans., 2016, 45, 10891
DOI: 10.1039/C6DT01880G

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