Low-activation-energy conduction in polycrystalline. cap alpha. -Al/sub 2/O/sub 3/ doped with Si and Na

Journal Article · Fri Feb 01 00:00:00 EST 1985 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1985.tb15267.x· OSTI ID:5035732

Lee, C H; Kroger, F A

Polycrystalline Al/sub 2/O/sub 3/ containing a glassy aluminosilicate second phase displays a low-activation-energy conductivity when Na is present. The conductivity is ionic in nature at high oxygen pressure and electronic at low oxygen pressure and is attributed to the migration of Na/sup +/ ions and electrons through the second phase present at triple junctions. A smaller lowactivation-energy conductivity is found in the absence of sodium, but in that case the low-activation-energy branch has different properties. Al/sub 2/O/sub 3/:Na without silicon has no lowtemperature low-activation-energy branch.

• OSTI ID: 5035732
• Journal Information: J. Am. Ceram. Soc.; (United States), Vol. 68:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CRYSTAL DOPING
IONIC CONDUCTIVITY
ACTIVATION ENERGY
ALUMINIUM SILICATES
DOPED MATERIALS
ELECTRON TRANSFER
POLYCRYSTALS
PRESSURE DEPENDENCE
SILICON
SODIUM
ALKALI METALS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEMIMETALS
SILICATES
SILICON COMPOUNDS
360603* - Materials- Properties