Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. II. Oxidation-reduction Behavior

Author

J. W. Stevenson
M. M. Nasrallah
Harlan U. Anderson, Missouri University of Science and TechnologyFollow
Don M. Sparlin, Missouri University of Science and TechnologyFollow

Abstract

Electrical conductivity, Seebeck coefficient, and thermogravimetric behavior of compositions in the systems Y_1-yCa_yMnO₃ and Y_1-yCa_yMnO₃ were studied as functions of temperature and ambient oxygen activity in order to determine the mechanism of electrical transport and defect structure. Compositions in Y_1-yCa_yMnO₃ exhibited very slight oxygen activity-dependent behavior as the ambient oxygen activity was reduced. A defect model which includes the thermally excited disproportionation of Mn³⁺ into Mn²⁺ and Mn⁴⁺ pairs was applied to the oxygen-activity-dependent data for La_0.80Ca_0.20MnO₃ and La_0.60Ca_0.40MnO₃. For these compositions, the experimentally observed dependence of oxygen stoichiometry, electrical conductivity, and Seebeck coefficient upon ambient oxygen activity was explained using this model. © 1993 Academic Press, Inc.

Recommended Citation

J. W. Stevenson et al., "Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. II. Oxidation-reduction Behavior," Journal of Solid State Chemistry, vol. 102, no. 1, pp. 185 - 197, Elsevier, Jan 1993.

The definitive version is available at https://doi.org/10.1006/jssc.1993.1021

Department(s)

Materials Science and Engineering

Second Department

Physics

International Standard Serial Number (ISSN)

1095-726X; 0022-4596

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

01 Jan 1993