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Phase transitions, relaxor behavior, and electrical properties in (1−x)(Bi0.5Na0.5)TiO3–x(K0.5Na0.5)NbO3 lead-free piezoceramics

Published online by Cambridge University Press:  17 October 2012

Jigong Hao ,
Wangfeng Bai ,
Wei Li ,
Bo Shen  and
Jiwei Zhai
Jigong Hao
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
Wangfeng Bai
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
Wei Li
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
Bo Shen
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
Jiwei Zhai*
Affiliation:
Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China
*
a)Address all correspondence to this author. e-mail: apzhai@tongji.edu.cn
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Abstract

Phase structures and electrical properties of lead-free piezoelectric (1−x)(Bi0.5Na0.5)TiO3–x(K0.5Na0.5)NbO3 (BNT–xKNN) ceramics with 0.08 ≤ x ≤ 0.19 were systematically investigated. Results showed that a phase transition from a tetragonal to a pseudocubic phase occurred in this system, as KNN content increases. The addition of KNN shifted both the depolarization temperature Td and rhombohedral–tetragonal phase transition temperature TR-T to lower temperatures and tended to enhance the relaxor behavior of the ceramics, which was well explained by the microdomain–macrodomain transition theory with calculating criterion K. At x = 0.10–0.11, Td reached room temperature (RT), which accordingly induced an enhancement of the unipolar strain that peaks at a value of 0.22% was obtained. Furthermore, as the compositions (x = 0.12–0.15) have Td below RT, samples exhibited high electrostrictive response with large electrostrictive coefficient Q33 (0.017–0.019 m4/C2) and good thermostability comparable with that of traditional Pb-based electrostrictors.

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Articles
Information
Journal of Materials Research , Volume 27 , Issue 23 , 14 December 2012 , pp. 2943 - 2955
Copyright
Copyright © Materials Research Society 2012

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