The defect chemistry of LaMnO[sub 3[+-][delta]]. 5. thermodynamics
- Netherlands Energy Research Foundation ECN, Petten (Netherlands)
The temperature dependence of the relationship between composition oxygen partial pressure has been described for LaMnO[sub 3+[delta]] and LaMnO[sub 3[minus][delta]] on the basis of an assessment of literature data obtained by TGA by several authors. The thermodynamics of defect formation is calculated on the basis of these results. For the formation of lanthanum and manganese vacancies in LaMnO[sub 3+[delta]], it has been determined that [Delta]H[degrees][sub V] = ([minus]380 [+-] 6) kJ[center dot]mole[sup [minus]1], and [Delta]S[degrees][sub V] = ([minus]266 [+-] 5) J[center dot]mole[sup [minus]1][center dot]K[sup [minus]1]. For the formation of oxygen vacancy clusters in LaMnO[sub 3[minus][delta]], [Delta]H[degrees][sub V] = (349 [+-] 6) kJ[center dot]mole[sup [minus]1], and [Delta]S[degrees][sub V] (96.4 [+-] 4.9) J[center dot]mole[sup [minus]1][center dot]K[sup [minus]1].
- OSTI ID:
- 6922962
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 110:1; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHALCOGENIDES
CHEMICAL ANALYSIS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ENERGY
ENTHALPY
FORMATION FREE ENTHALPY
FORMATION HEAT
FREE ENTHALPY
GRAVIMETRIC ANALYSIS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MANGANESE COMPOUNDS
MANGANESE OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
REACTION HEAT
STOICHIOMETRY
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VACANCIES