Evaluation of Ferrites for the Membrane Applications

Abstract

The structural, electric, and magnetic properties of ferrites was studied, emphasizing on the compounds of La0.60Sr0.40FeO3-δ, which are particularly interesting in oxygen membrane and the intermediate temperature solid oxide fuel cells. The powder Neutron Diffraction results showed that all specimens were single phase with an exception of the sample quenched with 90%CO/10%CO2, in which peak broadening and asymmetry took place that indicated a decomposition of the sample. In addition to the conductivity, oxygen vacancy concentration also played a key role in the function of cathodes, in particular in the catalytic properties. A large decrease in 3-δ was observed when the gas was changed from 90%CO tp 99%CO. La0.60Sr0.40FeO3 decomposed in the 99% CO atmosphere. The increase in the superexchange interaction resulted in an increase in Nèel temperature. The Fe moments for the three reduced samples refined between 3.72 and 3.82 μB, while the moments for the other two sample were much smaller.

Meeting Name

ACS Division of Fuel Chemistry, Preprints (2003, San Antonio, TX)

Department(s)

Materials Science and Engineering

Second Department

Physics

Third Department

Chemistry

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jan 2003

Link to Full Text

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