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Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5Na0.5NbO3-0.04LiSbO3 lead-free piezoelectric ceramics
作者姓名:赵静波  杜红亮  屈绍波  张红梅  徐卓
作者单位:[1]The College of Science, Air Force Engineering University, Xi'an 710051, China [2]State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China [3]Electronic Materials Research Laboratory (Key Laboratory of the Ministry of Education), Xi'an Jiaotong University, Xi'an 710049, China
基金项目:Project supported by the National Natural Science Foundation of China (Grant Nos. 10804130 and 60871027), the Natural Science Foundation of Shaanxi Province of China (Grant No. 2009JQ1001), and the Funds of the Key Laboratory of Electrical Insulation and Power Equipment (Grant No. EIPE10202).
摘    要:Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5+xNa0.5+xNbO3- 0.04LiSbO3 lead-free piezoelectric ceramics were examined for 0 ≤ x ≤ 0.02. The piezoelectric coefficients exhibited a maximum, d33 = 187 pC/N at x = 0.0075, coinciding with the maximum of the grain size and the apparent density at x = 0.0075. The apparent density and the piezoelectric coefficients decreased with increasing x at higher x which was likely due to the crystal geometrical distortion of 0.96K0.5+xNa0.5+xNbO3-0.04LiSbO3. In addition, super-large grains were found and this may be due to liquid phase sintering. Excess (K++Na+) attracted a sum of space charges to keep the charge neutral, resulting in charge leakage during the course of ceramic polarization, influencing the piezoelectric and ferroelectric properties. These findings are of importance for guiding the design of K0.5Na0.5NbO3-based lead-free ceramics with enhanced electrical properties.

关 键 词:lead-free  ceramics  piezoelectric  non-stoichiometry  K0.5Na0.5NbO3
收稿时间:2010-10-15

Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5Na0.5NbO3- 0.04LiSbO3 lead-free piezoelectric ceramics
Zhao Jing-Bo,Du Hong-Liang,Qu Shao-Bo,Zhang Hong-Mei and Xu Zhuo.Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5Na0.5NbO3-0.04LiSbO3 lead-free piezoelectric ceramics[J].Chinese Physics B,2011,20(6):67701-067701.
Authors:Zhao Jing-Bo  Du Hong-Liang  Qu Shao-Bo  Zhang Hong-Mei and Xu Zhuo
Institution:The College of Science, Air Force Engineering University, Xián 710051, China;State Key Laboratory of Electrical Insulation and Power Equipment, Xián Jiaotong University, Xián 710049, China;The College of Science, Air Force Engineering University, Xián 710051, China;State Key Laboratory of Electrical Insulation and Power Equipment, Xián Jiaotong University, Xián 710049, China;The College of Science, Air Force Engineering University, Xián 710051, China;Electronic Materials Research Laboratory (Key Laboratory of the Ministry of Education),Xián Jiaotong University, Xián 710049, China;The College of Science, Air Force Engineering University, Xián 710051, China;Electronic Materials Research Laboratory (Key Laboratory of the Ministry of Educatio14), Xián Jiaotong University, Xián 710049, China
Abstract:Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5 + xNa0.5 + xNbO3-0.04LiSbO3 lead-free piezoelectric ceramics were examined for 0 ≤ x ≤ 0.02. The piezoelectric coefficients exhibited a maximum, d33= 187 pC/N at x=0.0075, coinciding with the maximum of the grain size and the apparent density at x=0.0075. The apparent density and the piezoelectric coefficients decreased with increasing x at higher x which was likely due to the crystal geometrical distortion of 0.96K0.5 + xNa0.5 + xNbO3-0.04LiSbO3. In addition, super-large grains were found and this may be due to liquid phase sintering. Excess (K++Na+) attracted a sum of space charges to keep the charge neutral, resulting in charge leakage during the course of ceramic polarization, influencing the piezoelectric and ferroelectric properties. These findings are of importance for guiding the design of K0.5Na0.5NbO3-based lead-free ceramics with enhanced electrical properties.
Keywords:lead-free ceramics  piezoelectric  non-stoichiometry  K0  5Na0  5NbO3
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