Phase structure and electrical properties of 0.96(K0.5Na0.5)(Nb1-xSbx)O3-0.04LiTaO3 lead-free perovskite ceramics

Zhang Bin; Wenjuan Wu; Dingquan Xiao; Xiaolei Huang; Jing Li

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Phase structure and electrical properties of 0.96(K0.5Na0.5)(Nb1-xSbx)O3-0.04LiTaO3 lead-free perovskite ceramics

Zhang Bin 1,Wenjuan Wu 2,Dingquan Xiao 2 *,Xiaolei Huang 2,Jing Li 2

1.Department of Materials Science, Sichuan University

2.Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China

*Correspondence author

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education（No.SRFDP Nos. 20030610035, and 20080610020）, National Science Foundation of China （No.NSFC Nos. 50772068 and 50972095）

Opened online:13 July 2011

Accepted by: none

Citation: Zhang Bin ,Wenjuan Wu,Dingquan Xiao.Phase structure and electrical properties of 0.96(K0.5Na0.5)(Nb1-xSbx)O3-0.04LiTaO3 lead-free perovskite ceramics[OL]. [13 July 2011] http://en.paper.edu.cn/en_releasepaper/content/4433770

0.96(K0.5Na0.5)(Nb1-xSbx)O3-0.04LiTaO3 [0.96KNNSx-0.04LT] lead-free piezoelectric ceramics were synthesized by conventional solid-state method. The effects of Sb content on the phase structure and electric properties were system studied. The results show that the orthorhombic and tetragonal phases coexist in the 0.96KNNSx-0.04LT ceramics. The increase of Sb content induces a rapid decrease of the Curie temperature (Tc) and the orthorhombic-tetragonal polymorphic phase transition temperature (To-t). The 0.96KNNSx-0.04LT ceramics with x=0.05 exhibit excellent properties (d33~270 pC/N, kp~0.435, εr~1125, tan δ~0.05, Tc~328 ℃, To-t~54 ℃, Pr~20.5 μC/cm2 and Ec~1.07 kV/mm respectively). Enhanced electrical properties of the 0.96KNNSx-0.04LT ceramics should be attributed to the polymorphic phase transition near room temperature. The 0.96KNNSx-0.04LT ceramics is considered to be a promising candidate material for lead-free piezoelectric ceramics because of its excellent properties.

Keywords:Niobates KNN; Electrical properties; Polymorphic phase transition; Lead-free piezoelectric ceramics;

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