Thermochemical Stability, Electrical Conductivity, and Seebeck Coefficient of Sr-Doped LaCo0.2Fe0.8O3-Δ

Abstract

Phase stability, oxygen content, electrical conductivity, and Seebeck coefficient of La1-xSrxCo0.2Fe0.8O3-δ (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, LaFeO3 and LaCoO3, but the electrical properties are closer to those of LaFeO3. The Sr content (x ≤ 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)O4. Upon further reduction, these oxides dissociated to La2O3, SrO, Co, and Fe. © 1995 Academic Press. All rights reserved.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

1095-726X; 0022-4596

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Jan 1995

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