Oxidation-reduction behavior of undoped and Sr-doped LaMnO sub 3 : Defect structure, electrical conductivity, and thermoelectric power
- Univ. of Missouri, Rolla (USA)
Seebeck coefficient and electrical conductivity measurements were performed for undoped and Sr-doped LaMnO{sub 3} as a function of temperature and oxygen partial pressure. The results of electrical conductivity showed typical p-type behavior. As reduction proceeded, the electrical conductivity of these LaMnO{sub 3}-based perovskites decreased with P{sub O{sub 2}}{sup 1/4}. The analysis of the electrical conductivity data was performed by extending the defect model from a previous thermogravimetric (TG) study. The measured Seebeck coefficients were found to be positive except for the most reducing conditions when the decomposition into multiple phases occurred. These results indicated that the conduction was due to p-type carriers of a localized nature.
- OSTI ID:
- 6445939
- Journal Information:
- Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 87:1; ISSN 0022-4596; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METALS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELEMENTS
EXPERIMENTAL DATA
FUEL CELLS
INFORMATION
LANTHANUM
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTHS
REDOX REACTIONS
STRONTIUM
THERMOELECTRIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS