Five new E′ centers and their 29Si hyperfine structures in electron-irradiated α-quartz

Single-crystal electron paramagnetic resonance (EPR) spectra of fast-electron-irradiated quartz, after annealing at 120 and 200°C, reveal five new E ′ type centers, herein labeled . Centers are characterized by the orientations of the unique principal g and A ( 29 Si) axes close to a short Si–O bond...

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Bibliographic Details
Published in:Physics and chemistry of minerals 2012, Vol.39 (1), p.79-85
Main Authors: Mashkovtsev, Rudolf I., Pan, Yuanming
Format: Article
Language:English
Subjects:
Crystallography and Scattering Methods
Earth and Environmental Science
Earth Sciences
Geochemistry
Mineral Resources
Mineralogy
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Summary:Single-crystal electron paramagnetic resonance (EPR) spectra of fast-electron-irradiated quartz, after annealing at 120 and 200°C, reveal five new E ′ type centers, herein labeled . Centers are characterized by the orientations of the unique principal g and A ( 29 Si) axes close to a short Si–O bond direction, hence representing new variants of the well-established center. Centers and have the orientations of the unique principal g and A ( 29 Si) axes approximately along a long Si–O bond direction, similar to the centers. Therefore, these new E ′ type centers apparently arise from the removal of different oxygen atoms and represent variable local distortions around the oxygen vacancies.
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-011-0462-z