Electronic and silver ionic conductions in perovskite and related oxides
- Kumamoto Univ. (Japan)
Electronic and silver ionic conductivities in some silver-containing oxides with perovskite and related structures, such as AgNbO{sub 3} (perovskite), AgSbO{sub 3} (pyrochlore-related structure), and Ag-doped Bi-(Pb)-Sr-Ca-Cu-O-system superconductor, were measured by four-probe techniques using Pt electrodes and Ag-{beta}{double prime}-Al{sub 2}O{sub 3} electrodes with silver ionic conduction, respectively. Both AgNbO{sub 3} and AgSbO{sub 3} were n-type semiconductors and their electronic conductivities increased with an increase in the silver content. The electronic conductivity of AgSbO{sub 3} was higher than that of AgNbO{sub 3}, due to the presence of a large amount of oxygen vacancies. Sb{sup 4+} and/or Sb{sup 3+} in AgSbO{sub 3}, and Nb{sup 4+} in AgNbO{sub 3} will act as a donor. Silver ionic conductivities were always lower than the electronic conductivities brought about by the above donors for both AgNbO{sub 3} and AgSbO{sub 3} ceramics. The activation energies of silver ionic conductivity were in the ranges of 1.01-1.58, 0.78-0.90, and 0.94-1.12 eV for AgNbO{sub 3}, AgSbO{sub 3}, and Ag-doped Bi-system superconductors, respectively. The silver ion was assumed to move via the Ag sites in the bulk for AgNbO{sub 3}, but to move in the grain boundaries for AgSbO{sub 3} and the Bi-system superconductor. The mechanisms of the electronic and silver ionic conductions are discussed for the present oxide ceramics.
- OSTI ID:
- 7038906
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 99:2; ISSN JSSCB; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANTIMONY COMPOUNDS
ANTIMONY OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
IONIC CONDUCTIVITY
LEAD COMPOUNDS
LEAD OXIDES
MATERIALS
N-TYPE CONDUCTORS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SEMICONDUCTOR MATERIALS
SILVER COMPOUNDS
SILVER OXIDES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS