Investigation of precursors in the preparation of nanostructured La0.6Sr0.4Co0.2Fe0.8O3-δ via a modified combined complexing method

被引：47
作者：
Shao, Jing [1 ]
Tao, Youkun [1 ]
Wang, Jianxin [1 ]
Xu, Cheng [1 ]
Wang, Wei Guo [1 ]
机构：
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 484卷 / 1-2期
基金：
国家高技术研究发展计划(863计划);
关键词：
Electrode materials; Nanostructures; Chemical synthesis; Sol-gel synthesis; OXIDE FUEL-CELLS; STRUCTURAL-CHARACTERIZATION; ELECTRICAL-PROPERTIES; 1ST MONONUCLEAR; CITRATE COMPLEX; PEROVSKITE; LA1-XSRXCO1-YFEYO3; CONDUCTIVITY; MEMBRANE; CATHODES;
D O I：
10.1016/j.jallcom.2009.04.075
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：
A complexing precursor Of La0.6Sr0.4Co0.2Fe0.8O3-delta was synthesized through a modified combined complexing method to prepare homogenous La0.6Sr0.4Co0.2Fe0.8O3-delta narropowders with high yield at very low pH values. Precursors of La0.6Sr0.4Co0.2Fe0.8O3-delta compound with single chelator and of individual La, Sr, Co, Fe cations with combined chelators were also prepared and characterized. Fourier transform infrared spectroscopy results indicated EDTA could incorporate the Co, Fe cations into soluble complex under pH < 1. Using the citric acid-EDTA in this process could ensure the complexation of all cations and the best molar ratio of EDTA to metal cations was 0.5:1. Calcination of the combined complex precursor, according to XRD patterns, resulted in the crystallization of single phase LSCF by 700 degrees C. FESEM and BET analysis showed the calcined powder was homogenous and consisted of particles having sizes of approximately 70 nm. It is found that the sample of La0.6Sr0.4Co0.2Fe0.8O3-delta sintered at 1200 degrees C has a higher conductivity than at 1100 degrees C or 1300 degrees C, and the highest conductivity reaches 284 S cm(-1) at 700 degrees C. (C) 2009 Elsevier B.V. All rights reserved.
引用
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页码：263 / 267
页数：5
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