Electronic structure of defects in oxides. Final report, December 1, 1980-November 30, 1981. [MgAl/sub 2/O/sub 4/]

Technical Report · Thu Jan 01 00:00:00 EST 1981

OSTI ID:5562112

Summers, G P

Details of the electronic structure of F-type centers and charge trapping in the series of oxides SrO, CaO, MgO, ..cap alpha..-Al/sub 2/O/sub 3/ and MgAl/sub 2/O/sub 4/ have been determined using photoconductivity, luminescence, and fluorescence lifetimes. Measurements were made over the spectral range 1.5 to 6.5 eV and over the temperature range 4 to 350 K. The centers were introduced into SrO by electron, proton or neutron bombardment, into CaO, MgO, and ..cap alpha..-Al/sub 2/O/sub 3/ by electron or neutron bombardment, or thermochemical reduction, and into MgAl/sub 2/O/sub 4/ by particle bombardment. In some cases, notably CaO, MgO, and ..cap alpha..-Al/sub 2/O/sub 3/ exhibit phosphorescence near room temperature, with the emission occurring at the wavelength corresponding to the F center. Our work suggests that the electron trap involved is H/sup -/ ions, but this has only so far been confirmed for MgO.

• Research Organization: Oklahoma State Univ., Stillwater (USA). Dept. of Physics
• DOE Contract Number: AS05-76ER04837
• OSTI ID: 5562112
• Report Number(s): DOE/ER/04837-8; ORO-4837-8; ON: DE83018200
• Resource Relation: Other Information: Portions are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
RADIATION EFFECTS
ALUMINIUM OXIDES
CALCIUM OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
STRONTIUM OXIDES
ELECTRON BEAMS
ELECTRONIC STRUCTURE
F CENTERS
FLUORESCENCE
LUMINESCENCE
NEUTRON BEAMS
PHOSPHORESCENCE
PHOTOCONDUCTIVITY
PROTON BEAMS
RESEARCH PROGRAMS
TRAPPING
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BEAMS
CALCIUM COMPOUNDS
CHALCOGENIDES
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LEPTON BEAMS
NUCLEON BEAMS
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHYSICAL PROPERTIES
POINT DEFECTS
STRONTIUM COMPOUNDS
VACANCIES
360206* - Ceramics
Cermets
& Refractories- Radiation Effects