Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. I. Electrical Properties

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 and the Seebeck coefficient of compositions in the system Y_1-yCa_yMnO₃ and La_1-yCa_yMnO₃ were studied to determine the mechanism of electrical transport and defect structure. Electrical conduction appeared to occur via a small polaron hopping mechanism for compositions with 0.30 ≤ y ≤ 0.80. The Seebeck coefficient data did not support the assumption that Mn is present in Cadoped Mn perovskites only in the +3 and +4 valence states. A new defect model was developed which includes the thermally excited disproportion of Mn³⁺ and Mn⁴⁺ pairs. The Seebeck data were explained with this model by assuming that divalent Mn cations were site blockers in the conduction process. © 1993 Academic Press, Inc.

Recommended Citation

J. W. Stevenson et al., "Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. I. Electrical Properties," Journal of Solid State Chemistry, vol. 102, no. 1, pp. 175 - 184, Elsevier, Jan 1993.

The definitive version is available at https://doi.org/10.1006/jssc.1993.1020

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