Model studies of mixed-ion beta-aluminas

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6004377

Wang, J. C.; Bates, J. B.; Kaneda, T.; Engstrom, H.; Pickett, Jr., D. F.; Choi, S. I.

Conductivity anomalies observed in mixed ion beta-aluminas have been investigated by model calculations. These calculations include Coulomb, short-range repulsive, and polarization energy terms and show that: (1) when large mobile cations are introduced into beta-aluminas having smaller cations, the large cations tend to occupy positions near Beevers--Ross sites alone; (2) small mobile cations introduced into a beta-alumina having larger mobile cations tend to form pairs either with themselves or with the larger cations; and (3) for a mixed ion pair, the activation energy of the larger ion to escape from the shared potential well is much higher than that of the smaller ion.

• Research Organization: Oak Ridge National Lab., TN (USA); Hughes Aircraft Co., Los Angeles, CA (USA); North Carolina Univ., Chapel Hill (USA). Dept. of Physics and Astronomy
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6004377
• Report Number(s): CONF-790538--8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ACTIVATION ENERGY
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CONFIGURATION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
IONIC CONDUCTIVITY
IONS
LAYERS
LITHIUM
METALS
MOBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
POTASSIUM
RAMAN SPECTRA
SODIUM
SPECTRA
VACANCIES