Volume 133, Number 1, January 2021
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 March 2021|
EPR study of the E’ defects in optical glasses and cristobalite
1 Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences 630090 Novosibirsk, Russia
2 Vinogradov Institute of Geochemistry, Siberian Branch ofRussian Academy of Sciences 664033 Irkutsk, Russia
Received: 15 July 2020
Accepted: 7 December 2020
The electron paramagnetic resonance (EPR) in experimentaloptical glasses obtained from the East Sayan mountain quartzites has beenstudied. For comparison a powder sample of cristobalite that formed duringthe beneficiation process of quartzite was also investigated by EPR. Thecomplex EPR spectra of fast-electron-irradiated glass andcristobalite were treated by computer simulations to determine the types of centers and their principal gvalues. In glasses the well-known paramagnetic centers, , have been observed. In particular, thecenter previously characterized as stableonly below was observed as a stable variantat room temperature. In cristobalite the paramagnetic defects similar to the, , centers with slightly differentg values have been observed. From the observation of analogous centers it was inferred that local structuresof glass and -cristobalite aresimilar.
PACS: 42.70.Ce – Glasses, quartz / 61.72.J- – Point defects and defect clusters / 61.72.jd – Vacancies
© 2021 EPLA
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