Comparison of the thermal stability of a. beta. - and. beta. ''-alumina at high pressures. [5 to 50 kb, room temperature to 1400/sup 0/C]
Journal Article
·
· J. Solid State Chem.; (United States)
The high-pressure thermal stability of Na/sup +/ ..beta..-alumina and magnesium-stabilized Na/sup +/ ..beta..''-alumina was studied from 5 to 50 kb and from room temperature to 1400/sup 0/C. Above 5 kb and 560/sup 0/C, Na/sup +/ ..beta..-alumina decomposes into ..cap alpha..-Al/sub 2/O/sub 3/ and NaAlO/sub 2/. Magnesium-stabilized Na/sup +/ ..beta..''-alumina decomposes at slightly higher temperatures to ..cap alpha..-Al/sub 2/O/sub 3/, MgAl/sub 2/O/sub 4/, and probably NaAlO/sub 2/. Estimates of activation volume and enthalpy support a model for decomposition that depends on cation vacancies and proceeds by sodium diffusion in quasi-liquid conduction planes. 5 figures, 1 table.
- Research Organization:
- General Electric Co., Schenectady, NY
- OSTI ID:
- 7293280
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 20:2; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
25 ENERGY STORAGE
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL-PHASE TRANSFORMATIONS
DECOMPOSITION
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROLYTES
ENERGY STORAGE SYSTEMS
ENTHALPY
HIGH TEMPERATURE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MEDIUM TEMPERATURE
METAL-NONMETAL BATTERIES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SODIUM OXIDES
SODIUM-SULFUR BATTERIES
STABILITY
THERMODYNAMIC PROPERTIES
VERY HIGH PRESSURE
VERY HIGH TEMPERATURE
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL-PHASE TRANSFORMATIONS
DECOMPOSITION
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROLYTES
ENERGY STORAGE SYSTEMS
ENTHALPY
HIGH TEMPERATURE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MEDIUM TEMPERATURE
METAL-NONMETAL BATTERIES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SODIUM OXIDES
SODIUM-SULFUR BATTERIES
STABILITY
THERMODYNAMIC PROPERTIES
VERY HIGH PRESSURE
VERY HIGH TEMPERATURE