Synthesis and electrical properties of Ln0.6Ca0.4FeO3-6 (Ln=Pr, Nd, Sm) as cathode materials for IT-SOFC

被引:23
|
作者
Chen, Yong-hong [1 ]
Wei, Yi-jun
Zhong, Hong-hai
Gao, Jian-feng
Lin, Xing-qin
Meng, Guang-yao
机构
[1] Huainan Normal Univ, Ctr Expt & Commun, Huainan 232001, Peoples R China
[2] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
关键词
sintering; microstructure; electrical conductivity; perovskites;
D O I
10.1016/j.ceramint.2006.03.035
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Fine powders of Ln(0.6)Ca(0.4)FeO(3-8) (Ln=Pr, Nd, Sm) were prepared by a glycine-nitrate process (GNP). The preparation process, thermal properties, phase constituents, and microstructure of the samples were characterized by FT-IR, TG-DSC, XRD and TEM, respectively. The results show that all of the powders have perovskite-type structure with orthorhombic symmetry and mean particle size of 25 nm. The relative density of Pr0.6Ca0.4FeO3-delta and Nd0.6Ca0.4FeO3-delta decreased with sintering temperature, while increased for Sm0.6Ca0.4FeO3-delta. The DC four-probe measurement indicated that both Pr0.6Ca0.4FeO3-delta and Nd0.6Ca0.4FeO3-delta exhibit fairly high electrical conductivity, over 100S cm(-1) at T > 650 degrees C, high enough for application as cathode materials for IT-SOFC. The temperature dependence of the conductivity for Nd0.6Ca0.4FeO3-delta,S d consists of two straight lines with activation energies of 160.2 and 18.6 kJ mol(-1), respectively, for the sample sintered at 1100 degrees C for 2 h. The conduction mechanism of the materials is discussed in terms of non-stoichiometry. (c) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:1237 / 1241
页数:5
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