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ELECTRON SPIN RESONANCE STUDIES OF IRRADIATED GLASSES CONTAINING BORON

Journal Article · · Journal of Chemical Physics (U.S.)
DOI:https://doi.org/10.1063/1.1734118· OSTI ID:4129693
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Electron spin resonancc (ESR) spectra were observed for various types of alkali borate and borosilicate glasses that were exposed to gamma or thermal neutron irradiations. The irradiated alkali borate glasses (Li/sub 2/O- B/sub 2/ O/sub 3/, Na/sub 2/O- B/sub 2/O/sub 3/, K/sub 2/O- B/sub 2/O/sub 3/, Rb/sub 2/O- B/sub 2/O /sub 3/, and Cs/sub 2/O- B/sub 2/O/sub 3/) containing less than 25 mole % alkali oxide exhibit specta consisting of five peaks in the resonance absorption curve at an operating microwave frequency in the vicinity of 9.2 kMc/ sec. The same five-line resonance was also observed in the irradiated borosilicate glasses (Corning 7070, 7740, and 7720). Investigations of the irradiated glasses by means of a K-band ESR spectrometer operating at approximately 23.3 kMc,/sec yielded spectra that are partially, resolved into six lines. Alkali borate glasses isotopically enriched with B/sup 10/ display a 10- line resonance at the X-band frequency when irradiated with gamma rays or neutrons. It was concluded that the five- and six-line resonances arise from an axially symmetric hyperfine interaction of a hole with a B/sup 11/ nucleus, while the 10-line structure arises from such a hyperfine interaction with a B/sup 10/ nucleus. The atom containing this B/sup 11/ or B/sup 10/ nucleus is believed to be in a BO/sub 4/ tetrahedral configuration in the glass structure. (auth)
Research Organization:
Brown Univ., Providence
Sponsoring Organization:
USDOE
NSA Number:
NSA-18-003834
OSTI ID:
4129693
Journal Information:
Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 39; ISSN JCPSA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ABSORPTION
BORON 10
BORON 11
BORON OXIDES
CESIUM OXIDES
CHEMISTRY
CONFIGURATION
DIAGRAMS
ELECTRONS
FREQUENCY
GAMMA RADIATION
GLASS
HYPERFINE STRUCTURE
INTERACTIONS
LATTICES
LITHIUM OXIDES
MICROWAVES
NEUTRON BEAMS
POTASSIUM OXIDES
RESONANCE
RUBIDIUM OXIDES
SODIUM OXIDES
SPECTRA
SPIN