Electrical conduction in CaO-doped thoria electrolytes
Journal Article
·
· J. Electrochem. Soc.; (United States)
The electrical conductivity of sintered specimens of nominally pure thoria and thoria doped with 1-15 mole percent (m/o) CaO was measured between 600/sup 0/ and 1400/sup 0/C in the P/sub 02/ range of 1-10/sup -25/ atm. The measured conductivity decreases initially with decreasing P/sub 02/ (mixed conduction region where electron holes and oxygen ions contribute), until it becomes independent of P/sub 02/ (ionic conduction region). The P/sub 02/ corresponding to the transition between these regions is a function of temperature and composition. The variation of conductivity with temperature gives rise to three regions: the high temperature region where the conductivity is attributed to dissociated vacancies, an intermediate temperature range where associated vacancy-impurity complexes dominate, and a low temperature region where grain boundary effects appear to become significant. The activation energy for electrical conduction is a function of composition and P/sub 02/. (7 figures, 31 references)
- Research Organization:
- Indian Inst. of Tech., Kanpur
- OSTI ID:
- 7125074
- Journal Information:
- J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 123:11; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
30 DIRECT ENERGY CONVERSION
300503 -- Fuel Cells-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYOGENIC FLUIDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTROLYTES
ELEMENTS
FLUIDS
FUEL CELLS
HIGH-TEMPERATURE FUEL CELLS
HOLES
IONIC CONDUCTIVITY
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
PRESSURE DEPENDENCE
QUANTITY RATIO
TEMPERATURE DEPENDENCE
THORIUM COMPOUNDS
THORIUM OXIDES
VACANCIES
300503 -- Fuel Cells-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYOGENIC FLUIDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTROLYTES
ELEMENTS
FLUIDS
FUEL CELLS
HIGH-TEMPERATURE FUEL CELLS
HOLES
IONIC CONDUCTIVITY
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
PRESSURE DEPENDENCE
QUANTITY RATIO
TEMPERATURE DEPENDENCE
THORIUM COMPOUNDS
THORIUM OXIDES
VACANCIES