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Rhombohedral-Orthorhombic Phase Transition Induced Enhancement on the Electrical Behavior of (K0.5Na0.5)NbO3-BiScO3-BiCoO3 Lead-free Piezoelectric Ceramics

Published online by Cambridge University Press:  13 June 2012

Wenjuan Wu ,
Dingquan Xiao ,
Jiagang Wu ,
Jing Li ,
Wenfeng Liang  and
Jianguo Zhu
Wenjuan Wu
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China
Dingquan Xiao
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China
Jiagang Wu
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China
Jing Li
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China
Wenfeng Liang
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China
Jianguo Zhu
Affiliation:
Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China
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Abstract

(1-x)K0.5Na0.5NbO3-x(0.97BiScO3-0.03BiCoO3) (KNN-xBSC) piezoelectric ceramics were prepared by the conventional solid-state method, and effects of the BSC addition on the phase structure, relaxor behavior, and electrical properties of KNN ceramics were systematically investigated. The rhombohedral to orthorhombic phase transition around room temperature was identified for the KNN-xBSC ceramics in the composition range of 0.015≤ x ≤0.0175, and improved electrical properties (d33∼205 pC/N, kp∼0.43, εr∼1315, and tan δ∼0.054) were observed for the ceramic with x=0.015 because of the involvement of such a phase transition at room temperature. Moreover, a relaxor ferroelectric behavior is demonstrated for these KNN-xBSC ceramics because of a more complex occupation of A and B sites in the ABO3 perovskite structure, together with a weak ferromagnetic order at room temperature.

Keywords

dielectric propertiesferromagneticpiezoelectric
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1397: Symposium P – Ferroelectric and Multiferroic Materials , 2012 , mrsf11-1397-p04-01
Copyright
Copyright © Materials Research Society 2012

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