Effect of interfacial space-charge polarization on the ionic conductivity of composite electrolytes

Journal Article · Tue Oct 01 00:00:00 EDT 1985 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1985.tb11520.x· OSTI ID:6345875

Dudney, N J

An enhanced carrier concentration within the interfacial space-charge layers has been proposed as one possible mechanism leading to the enhanced ionic conductivity observed for a variety of composite electrolytes containing a dispersed second phase of fine insulating particles such as Al2O3. This study tests this proposal by estimating the maximum space-charge polarization that might reasonably occur at interfaces of nominally pure AgCl, US -AgI, and LiI. The resulting interface conductances are used in effective medium calculations of the total conductivity of a randomly distributed composite of these salts with Al2O3 particles. Comparison of the results with published conductivities for the composites shows that the modest enhancement found for AgCl/Al2O3 can be accounted for by the interfacial space-charge polarization. However, the large (50- to 500-fold) enhancements found for US -AgI/Al2O3 and LiI/Al2O3 must be attributed to another mechanism.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN
• OSTI ID: 6345875
• Journal Information: J. Am. Ceram. Soc.; (United States), Vol. 68:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTROLYTES
IONIC CONDUCTIVITY
POLARIZATION
SPACE CHARGE
ALUMINIUM OXIDES
CALCULATION METHODS
CHARGE CARRIERS
COMPOSITE MATERIALS
ELECTRICAL INSULATORS
INTERFACES
LITHIUM IODIDES
SILVER CHLORIDES
SILVER IODIDES
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORS
PHYSICAL PROPERTIES
SILVER COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties