Effects of UV exposure on E' centers formed in crushed quartz grains

Electron spin resonance (ESR) study of E' centers in crushed quartz (SiO 2 ) indicated the formation of a new type of E' center by UV-irradiation. On the other hand, the concentration of E' centers formed by γ-irradiation in the crushed quartz is reduced by UV-irradiation. It was poss...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 35; no. 8; pp. 4463 - 4467
Main Authors HIRAI, M, IKEYA, M
Format Journal Article
LanguageEnglish
Published Tokyo Japanese journal of applied physics 01.08.1996
Subjects
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochronology
Isotope geochemistry. Geochronology
Mineralogy
Silicates
gamma rays
ESR spectra
simulation
grinding
quartz
ultraviolet rays
annealing
irradiation
electron spin resonance
activation energy
silicates
framework silicates
computers
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Summary:Electron spin resonance (ESR) study of E' centers in crushed quartz (SiO 2 ) indicated the formation of a new type of E' center by UV-irradiation. On the other hand, the concentration of E' centers formed by γ-irradiation in the crushed quartz is reduced by UV-irradiation. It was possible to distinguish between the three types of E' centers in crushed quartz (E' c : formed simply by crushing, E' UV : formed by crushing and UV-irradiation and E' γ : formed by crushing and γ-irradiation) using UV-irradiation. The distribution of the activation energy of the E' centers just after crushing was revealed by annealing experiments and computer simulation. The technique of characterization by UV-irradiation will be useful for evaluating the local strain in SiO 2 , especially in natural quartz.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.35.4463