Percolative ionic conduction in the LiAlSiO/sub 4/ glass-ceramic system

Journal Article · Wed Jun 15 00:00:00 EDT 1977 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.15.5912· OSTI ID:7110765

Biefeld, R M; Pike, G E; Johnson, Jr, R T

The effect f crystallinity on the lithium ion conductivity in LiAlSiO/sub 4/ glass and glass-ceramic solid electrolytes has been determined. The ionic conductivity is thermally activated with an activation energy and pre-exponential factor that change in a marked and nonsimple manner as the volume fraction of crystallinity changes. These results are explained by using a continuum percolation model (effective-medium approximation) which assumes that ionic conduction in the glass-ceramic is almost entirely within the glass phase until the crystalline volume fraction rises above approx. 55%. The LiAlSiO/sub 4/ system would seem to be nearly ideal for application of percolation theory since the crystalline phase, ..beta.. eucryptite, has nearly the same composition as the glass phase. Hence, as the crystallite volume fraction increases in the glass ceramic, the residual glass composition and conductivity remain the same. This is the first application of percolation theory to ionic transport in glass-ceramics and excellent agreement is obtained between theory and experiment for the LiAlSiO/sub 4/ system.

• Research Organization: Sandia Laboratories, Albuquerque, New Mexico 87115
• OSTI ID: 7110765
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 15:12; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CERAMICS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROLYTES
GLASS
IONIC CONDUCTIVITY
LITHIUM COMPOUNDS
LITHIUM SILICATES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SILICATES
SILICON COMPOUNDS