Characterization of. gamma. -ray induced paramagnetic centers in bayerite by means of EPR and ENDOR spectroscopies
Four different paramagnetic centers, induced in bayerite samples by irradiation, have been characterized by EPR and ENDOR spectroscopies. Two of them, respectively, of V- and F-types, have been found to be mobile at room temperature and frozen at lower temperature. The first one, with g/sub 1/= 2.021 +- 0.002, g/sub 2/=2.010 +- 0.005, and g/sub 3/=2.005 +- 0.002, is identified with an O/sup -/ species stemming from the ionization of OH/sup -/ groups present in the structural cavity walls of the bayerite. The second one, with g/sub parallel/=1.9970 +- 0.0005 and g/sub perpendicular/=2.0020 +- 0.0005, corresponds to solvated electrons. A third center, with g/sub parallel/=2.035 +- 0.002 and g/sub perpendicular/=2.0025 +- 0.0005, with strongly hindered motion even at room temperature, is assigned to an O/sup -//sub 2/ species located at the center of the structural cavity, U. The last center is a doublet with a 502.5 +- 0.5 Oe hyperfine splitting and g/sub iso/= 2.0022 +- 0.0001; it is due to H atoms located in U. Particular attention has been paid to the ''matrix'' ENDOR line at the free proton nuclear frequency and to the nature of the nuclear and electronic relaxation mechanisms that govern its shape and intensity. (AIP)
- Research Organization:
- Facultes Universitaires de Namur, Laboratoire de Catalyse, 61, rue de Bruxelles, Namur-B 5000, Belgium
- OSTI ID:
- 7343453
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 65:3; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMISTRY
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
ENDOR
GAMMA RADIATION
IONIZING RADIATIONS
MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RESONANCE