Thermochemical stability, electrical conductivity, and Seebeck coefficient of Sr-doped LaCo{sub 0.2}Fe{sub 0.8}O{sub 3-{delta}}
Journal Article
·
· Journal of Solid State Chemistry
- Univ. of Missouri, Rolla, MO (United States)
Phase stability, oxygen content, electrical conductivity, and Seebeck coefficient of La{sub 1-x}Sr{sub x}Co{sub 0.2}Fe{sub 0.8}O{sub 3-{delta}} (x = 0, 0.2, 0.4) were studied as a function of temperature and oxygen activity. The thermochemical properties of these compositions under a reducing atmosphere appear to follow the boundaries set between the two end members, LaFeO{sub 3} and LaCoO{sub 3}, but the electrical properties are closer to those of LaFeO{sub 3}. The Sr content (x {le} 0.4) does not seem to have a significant effect on the high-temperature phase stability. Dissociation of these compositions under a reducing atmosphere occurred gradually by the formation of transient compounds. The major transient compounds formed during dissociation could be represented by a general formula of (La, Sr) (Fe, Co)O{sub 4}. Upon further reduction, these oxides dissociated to La{sub 2}O{sub 3}, SrO, Co, and Fe.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 146454
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 118; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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