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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
#Submitted by
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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