Semiempirical model for the electrical properties of La{sub 1{minus}{ital x}}Ca{sub {ital x}}CoO{sub 3}
- Departments of Physics and Ceramic Engineering, University of Missouri-Rolla, Rolla, Missouri 65401 (United States)
A semiempirical model of the Seebeck coefficient for a small polaron hopping conductor is presented. The population of small polarons is allowed to change as a function of temperature via the mechanism of charge disproportionation. The energy required for polaron formation by the disproportionation mechanism is modeled as screened by a Coulomb interaction with nearby small polarons. The charge carrier site occupancies generated by the model are used to successfully predict the electrical conductivity and Seebeck coefficient for compositions in the La{sub 1{minus}{ital x}}Ca{sub {ital x}}CoO{sub 3} system. Cobalt ion valence populations predicted by the model are used to calculate effective paramagnetic moments for LaCoO{sub 3}, which are favorably compared to those found experimentally.
- DOE Contract Number:
- FG02-85ER45219
- OSTI ID:
- 124753
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 16 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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