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Citation: CHEN Yong-Hong, WEI Yi-Jun, ZHONG Hong-Hai, GAO Jian-Feng, LIU Xing-Qin, MENG Guang-Yao. Synthesis and Properties of La_0.5RE_0.3Sr_0.2Fe_O3－δ (RE = Nd, Ce, Sm) System with Two Rare Earths for Cathodes[J]. Acta Physico-Chimica Sinica, ;2005, 21(12): 1357-1362. doi: 10.3866/PKU.WHXB20051206 shu

Synthesis and Properties of La_0.5RE_0.3Sr_0.2Fe_O3－δ (RE = Nd, Ce, Sm) System with Two Rare Earths for Cathodes

1.
1Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026; 2Center of Experiment and Communication, Huainan Normal College, Huainan 232001

Received Date: 21 April 2005
Available Online: 15 December 2005

Two rare earths composite oxides of La0.5RE0.3Sr0.2FeO3－δ(RE = Nd, Ce, Sm) with A-site doped Sr2+ samples were synthesized by Glycine-Nitrate processes (GNP). The formation process of the perovskite structure was analyzed by means of X-ray powder diffraction and TG-DSC. The relative density of the ceramics was measured by Archimedes method, and the electrical conductivity of the samples was studied by four-probe technique. The results show that the sample for RE = Nd presents a single perovskite-type phase with a cubic symmetry after sintering at 1200 ℃ for 2 h, while the samples with Ce doped showed a separated cubic phase of CeO2, and the specimen doped with Sm is a cubic perovskite-type phase accompanied by some faint impure peaks. The electrical conductivity of La0.5Nd0.3Sr0.2FeO3－δ (LNSF) sample obtained from being sintered at 1250 ℃ for 2 h was over 100 S•cm-1, significantly higher than that of the La0.5Ce0.3Sr0.2FeO3－δ(LCSF) and La0.5Sm0.3Sr0.2FeO3－δ (LSSF) at the same conditions. The results indicate that La0.5Nd0.3Sr0.2FeO3－δ may be a suitable cathode material for intermediate temperature SOFC.
- La0.5RE0.3Sr0.2FeO3－δ(RE = Nd, Ce, Sm);SOFC;Perovskite-type;Cathodes
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Synthesis and Properties of La0.5RE0.3Sr0.2FeO3－δ (RE = Nd, Ce, Sm) System with Two Rare Earths for Cathodes

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Properties of La_0.5RE_0.3Sr_0.2Fe_O3－δ (RE = Nd, Ce, Sm) System with Two Rare Earths for Cathodes