Magnetic resonance studies on radiation-induced point defects in mixed oxide glasses. I. Spin centers in B{sub 2}O{sub 3} and alkali borate glasses

Radiation-induced spin centers in vitreous boron trioxide and alkali borate glasses were studied using pulsed electron paramagnetic resonance (EPR). It is shown that electrons and holes in these glasses are trapped on valence alternation defects, undercoordinated oxygen (holes) and overcoordinated o...

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Bibliographic Details
Published inJournal of non-crystalline solids Vol. 262; no. 1-3 ; Feb. 2000
Main Authors Shkrob, I. A., Tadjikov, B. M., Trifunac, A. D., Chemistry
Format Journal Article
LanguageEnglish
Published United States 01.02.2000
Subjects
BORATES
ELECTRON SPIN RESONANCE
ELECTRONIC STRUCTURE
GLASS
IRRADIATION
MATERIALS SCIENCE
MOLECULAR STRUCTURE
POINT DEFECTS
RADIATION EFFECTS
SPIN
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Summary:Radiation-induced spin centers in vitreous boron trioxide and alkali borate glasses were studied using pulsed electron paramagnetic resonance (EPR). It is shown that electrons and holes in these glasses are trapped on valence alternation defects, undercoordinated oxygen (holes) and overcoordinated oxygen (electrons). The local environment around these defects has major effect on spin parameters of the corresponding spin centers. The electronic and atomic structure of spin-1/2 centers and their diamagnetic precursors is analyzed using semiempirical and ab initio calculations.
Bibliography:USDOE Office of Science (SC)
DE-AC02-06CH11357
EM
ANL/CHM/JA-32588
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(99)00668-7