banner.jpg 10.3850/S201042862015001295 Effect of Nb2O5 on the Microstructure and Electrical Properties of High Curie Temperature 0.1BiYbO3 -0.9PbTiO3 Ceramics Junhui Li1,2, Chaochao Zhang1, Yugang Liu3, Huawei Zhang3, Zhanjing Li3,
Le Yang1, Xiangchun Liu2, Feng Gao1,a 1State 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+. Pr 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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