CHU Ruiqing 1 , YAO Zhongran 1, 2 , XU Zhijun 1 , HAO Jigong 2
(1. School of Environmental and Materials Engineering, Yantai University, Yantai 264005, Shandong, China;
2. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, Shandong, China)
Abstract: SrBi2-xDyxNb2O9(x=0, 0.03, 0.05, 0.07) ceramics were prepared by solid state reaction method, and their microstructure, electrical and temperature stability properties were systematically investigated. It is found that Dy-doping does not change the phase structure of SrBi2-xDyxNb2O9. With the increasing of the Dy3+ content, the microstructures of the SrBi2-xDyxNb2O9ceramics have no significant change. The remnant polarization (Pr) increases firstly and then decreases, reaching the maximum value at x=0.01, while the coercive field (Ec) decreases gradually. Furthermore, the Curie temperature decreases from 444°C to 427°C with the increase of the Dy3+ content. These results can be related to the lattice distortion caused by Dy-doping. The optimum electrical properties can be obtained at x=0.03 as 2Pr=16.4 μC/cm2, Ec=58 kV/cm, and Tc = 436 °C, showing good temperature stability for high temperature applications.
Key words: ceramics; Dy3+-doping; SrBi2-xDyxNb2O9; electrical properties