Influence of trivalent Gd and Dy codoping on the structure and electrical conductivity of pyrochlore-type Sm2Zr2O7

被引:16
作者
Xia, Xiao-Liang [1 ,2 ]
Liu, Zhan-Guo [1 ]
Ouyang, Jia-Hu [1 ]
Zheng, Yi [2 ]
机构
[1] Harbin Inst Technol, Inst Adv Ceram, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Shandong Acad Sci, Shandong Prov Key Lab Ocean Environm Monitoring T, Inst Oceanog Instrumentat, Qingdao 266001, Peoples R China
基金
中国国家自然科学基金;
关键词
Codoping; Solid electrolyte; Electrical conductivity; Impedance spectroscopy; IONIC-CONDUCTIVITY; SUBSTITUTION; YTTERBIUM; DISORDER;
D O I
10.1016/j.jpowsour.2012.06.034
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
SmDy1-xGdxZr2O7 (0 <= x <= 1.0) ceramics are prepared by solid state reaction method at 1973 K for 10 h in air. The crystal structure and microstructure of SmDy1-xGdxZr2O7 ceramics are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). All the SmDy1-xGdxZr2O7 ceramics (x = 0.2, 0.4, 0.6, 0.8, 1.0) exhibit a pyrochlore structure except for SmDyZr2O7 ceramic. SmDyZr2O7 ceramic has a defective fluorite structure. The incorporation of Gd3+ facilitates a structural evolution from a defective fluorite into an ordered pyrochlore-type structure. Electrical conductivity of SmDy1-xGdxZr2O7 ceramics has been investigated by impedance spectroscopy over a frequency range of 1 Hz to 8 MHz from 673 to 1173 K. The grain conductivity of SmDy1-xGdxZr2O7 ceramics follows the Arrhenius behavior. The grain conductivity of SmDy1-xGdxZr2O7 ceramics increases obviously with increasing Gd3+ content in the temperature range of 673-1073 K, and the optimal grain conductivity value is 1.90 x 10(-2) S cm(-1) in the composition of SmGdZr2O7 ceramic at 1173 K. All the SmDy1-xGdxZr2O7 ceramics are purely oxide ionic conductors in the test temperature range. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:316 / 321
页数:6
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