Structure, ferroelectric and dielectric properties of Bi2WO6 with different bismuth content
Wang Xiao-Juan(王晓娟)a)b)†, Gong Zhi-Qiang(龚志强)b)c), Zhu Jun(朱骏)b), and Chen Xiao-Bing(陈小兵)b)
a College of Physics and Electronic Engineering, Changshu Institute of Technology, Changshu 215500, China; b College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China; c Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China
Abstract This paper reports that the Bi2WO6 ferroelectric ceramics with excess Bi2O3 of 0.0, 2.0, 3.5 and 5.0wt.% of the stoichiometric composition are prepared by the conventional solid-state reaction method. Their microstructure, ferroelectric properties, the concentration and mobility of the defects have been analysed systematically. With increasing Bi content, the remnant polarization decreases, and the broken-down voltage increases. The optimum Bi excess, 3.5, lowers the oxygen vacancy concentration, while further Bi-addition brings about more defects. The activation energies fitted from cole-cole plots are 0.97eV, 1.07eV, 1.18eV, and 1.33eV, respectively. This suggests that the mobility of the defects is weakened by Bi-addition, which may be due to the increase of the ratio of the number of Bi2O2 layers to that of the perovskite blocks.
Received: 30 April 2008
Revised: 16 August 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10274066) and the
Natural Science Foundation of Jiangsu Province, China (Grant No
BK2005052).
Cite this article:
Wang Xiao-Juan(王晓娟), Gong Zhi-Qiang(龚志强), Zhu Jun(朱骏), and Chen Xiao-Bing(陈小兵) Structure, ferroelectric and dielectric properties of Bi2WO6 with different bismuth content 2009 Chin. Phys. B 18 803
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