EPR and electron-nuclear double-resonance studies of an F/sup +/ center in sodium, potassium, and lithium. beta. -alumina
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
EPR and electron-nuclear double-resonance (ENDOR) data from F/sup +/ centers in the conduction planes of sodium, potassium and lithium ..beta..-alumina are presented. The low-temperature Ku-band ENDOR spectra from these fast ionic conductors consist of sharp resonances from distant nuclei and broad, unresolved signals from nearest-neighbor aluminum and nearby Na, K, or Li cations in the conduction plane. The Na data are consistent with x-band ENDOR results of others. The K and Li data reveal the existence of a second inequivalent F/sup +/ center in these materials. The shape and breadth of the Na ENDOR signal can be simulated assuming that: (1) both Beevers-Ross and mid-oxygen sites are occupied, (2) the F/sup +/-ligand hyperfine interaction varies with distance as 1/R/sup 3/, and (3) there exists a Gaussian distribution of hyperfine couplings which is consistent with a 0.3-A tunneling distance inferred for Na ions from dielectric susceptibility data on Na ..beta..-alumina.
- Research Organization:
- Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
- OSTI ID:
- 5953827
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 24:9; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL DOPING
CRYSTAL STRUCTURE
DATA
ELECTRON SPIN RESONANCE
ELEMENTS
ENDOR
EXPERIMENTAL DATA
F CENTERS
IMPLANTS
INFORMATION
LITHIUM
LOW TEMPERATURE
MAGNETIC RESONANCE
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
POTASSIUM
RESONANCE
SODIUM
VACANCIES
360104* -- Metals & Alloys-- Physical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL DOPING
CRYSTAL STRUCTURE
DATA
ELECTRON SPIN RESONANCE
ELEMENTS
ENDOR
EXPERIMENTAL DATA
F CENTERS
IMPLANTS
INFORMATION
LITHIUM
LOW TEMPERATURE
MAGNETIC RESONANCE
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
POTASSIUM
RESONANCE
SODIUM
VACANCIES