doi: 10.3850/S201042862015001295

Effect of Nb₂O₅ on the Microstructure and Electrical Properties of High Curie Temperature 0.1BiYbO₃ -0.9PbTiO₃ Ceramics

Junhui Li^1,2, Chaochao Zhang¹, Yugang Liu³, Huawei Zhang³, Zhanjing Li³,
Le Yang¹, Xiangchun Liu², Feng Gao^{1,a 1}State Key Laboratory of Solidification Processing, School of Materials Science and Engineering,
Northwestern Polytechnical University, Xi'an Shaanxi 710072, P.R. China ^agaofeng@nwpu.edu.cn ²Department of Materials Science and Engineering,
Xi'an University of Science and Technology, Xi'an 710054, P.R. China ³Aviation Key Laboratory of Science and Technology on Inertia,
FACRI, Xi'an Shaanxi 710065, P.R. China

ABSTRACT

0.1BiYbO₃-0.9PbTiO₃+xNb₂O₅ (BYNPT) ceramics were prepared by the conventional solid state reaction. The effect of Nb₂O₅ on the microstructure and electrical properties of ceramics were investigated. The results show that when Nb₂O₅ amount increasing from 0.1wt% to 0.7wt%, there are two phases coexisting in the BYNPT ceramics?one is the perovskite phase, the other is Yb₂Ti₂O₇. With Nb₂O₅ amount increasing, Yb₂Ti₂O₇ and Tcdecrease, the d₃₃ increases firstly and then decreases. When the amount of Nb₂O₅ equals to 2wt%, Nb₂O₅ reached solid solution limit and the BYNPT ceramics shows the best electrical properties. Continue to increase the amount of Nb₂O₅, pyrochlore phase Pb₂Nb₂O₇ would be generated and the content of Pb₂Nb₂O₇ increases. The defect chemistry theory were adopted to explain the effect mechanism of Nb⁵⁺. P_r values were determined by the decrease of oxygen vacuum and the increases of Bi and Pb vacancies.

Keywords: Piezoelectric ceramic, Curie temperature, Microstructure, Electrical properties.

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