Effect of Sm substitution for Gd on the electrical conductivity of fluorite-type Gd2Zr2O7

被引：68

作者：

Liu, Zhan-Guo ^{[1
]}

Ouyang, Jia-Hu ^{[1
]}

Zhou, Yu ^{[1
]}

Xia, Xiao-Liang ^{[1
]}

机构：

[1] Harbin Inst Technol, Dept Mat Sci, Inst Adv Ceram, Harbin 150001, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2008年 / 185卷 / 02期

关键词：

Gd2-xSmxZr2O7; Electrical conductivity; Impedance spectroscopy; Substitution;

D O I：

10.1016/j.jpowsour.2008.09.005

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：

Gd2-xSmxZr2O7 (x=0, 0.2, 0.6, 1.0, 1.4, 1.8, 2.0) ceramic powders synthesized with the chemical-coprecipitation and calcination method were pressureless-sintered at 1873 K for 10 h in air. The electrical conductivity of Gd2-xSmxZr2O7 ceramics was investigated by complex impedance spectroscopy over a frequency range of 0.01 Hz to 15 MHz. Gd2-xSmxZr2O7 is an oxide-ion conductor in the oxygen partial pressure range from 1.0 x 10(-15) to 1.0 atm and in the temperature range of 623-873 K. The measured electrical conductivity obeys the Arrhenius relation. The activation energy and pre-exponential factor for grain-interior conductivity gradually decrease with increasing Sm content. The grain-interior conductivity varies with the Sm substitution for Gd, and reaches the maximum at the equal molar of Sm and Gd3+ in Gd2-xSmxZr2O7 ceramics. A significant increase in the grain-interior conductivity is obtained by isovalent rare-earth element like Sm Substitution for Gd in the temperature range of 623-873 K. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：876 / 880

页数：5

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