Antiferroelectric behavior and giant strain in BNKT ceramics complex Cs2Nb4O11 tungsten bronze phase

BNT-based ceramics are very attractive for the electrical energy storage and electric field-induced strain. However, the reported BNT-based ceramics are usually the perovskite solid solution. In this work, the super adjustability of Cs2Nb4O11 antiferroelectric phase for lead-free (1-x)Bi0.5(Na0.82K0...

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Bibliographic Details
Published in:Ceramics international 2020-06, Vol.46 (8), p.10067-10074
Main Authors: Huo, Ziwei, Wang, Hua, Xu, Jiwen, Rao, Guanghui, Wang, Jiang, Zhou, Changrong, Yuan, Changlai
Format: Article
Language:English
Subjects:
Antiferroelectric
BNT
Cs2Nb4O11
Giant strain
Tungsten bronze
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Summary:BNT-based ceramics are very attractive for the electrical energy storage and electric field-induced strain. However, the reported BNT-based ceramics are usually the perovskite solid solution. In this work, the super adjustability of Cs2Nb4O11 antiferroelectric phase for lead-free (1-x)Bi0.5(Na0.82K0.18)0.5TiO3-xCs2Nb4O11 ceramics with complex-phase are carefully studied. The Bi0.5(Na0.82K0.18)0.5TiO3 ceramics modified by a trace of Cs2Nb4O11 component suddenly transform to antiferroelectric phase from typical ferroelectric. A giant strain of 0.48% and a d33* of 600 pm/V are obtained originating from a reversible transition between antiferroelectric and ferroelectric states. And a high energy density of 1.0 J/cm3 is also achieved by reversible phase transitions. Therefore, the composite ceramics by designing tungsten bronze and perovskite complex phase illustrate great potential for actuator or energy storage applications.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2019.12.274