Oxidation-reduction behavior of undoped and Sr-doped LaMnO sub 3 nonstoichiometry and defect structure
- Univ. of Missouri, Rolla (USA)
Undoped and Sr-doped LaMnO{sub 3} showed reversible oxidation-reduction behavior. These perovskites can be excess, stoichiometric or deficient in oxygen content depending on the specific conditions. Under very reducing conditions decomposition into new phases occurs. Phase stabilities for these oxides were determined. The results showed that Sr doping caused the LaMnO{sub 3} to dissociate at higher oxygen activities than those necessary for undoped LaMnO{sub 3}. Defects models are proposed to interpret the thermogravimetric results in which metal vacancies are assumed for the oxygen excess condition and oxygen vacancies are assumed for the oxygen deficient condition. Thermodynamic properties were calculated which support the model.
- OSTI ID:
- 7247494
- Journal Information:
- Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 83:1; ISSN JSSCB; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
Similar Records
Oxidation-reduction behavior of undoped and Sr-doped LaMnO sub 3 : Defect structure, electrical conductivity, and thermoelectric power
The defect chemistry of LaMnO[sub 3[+-][delta]]. 4. Defect model for LaMnO[sub 3+[delta]]
Related Subjects
360000* -- Materials
360100 -- Metals & Alloys
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METALS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
DOPED MATERIALS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LANTHANUM
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
RARE EARTHS
STRONTIUM
TRANSITION ELEMENT COMPOUNDS