EPR study of the E’ defects in optical glasses and cristobalite

R. I. Mashkovtsev; A. I. Nepomnyashchikh; A. P. Zhaboedov; A. S. Paklin

doi:10.1209/0295-5075/133/14003

All issues

Volume 133 / No 1 (January 2021)

EPL, 133 1 (2021) 14003

Abstract

Issue		EPL Volume 133, Number 1, January 2021


Article Number		14003
Number of page(s)		7
Section		Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI		https://doi.org/10.1209/0295-5075/133/14003
Published online		05 March 2021

EPL, 133 (2021) 14003

EPR study of the E’ defects in optical glasses and cristobalite

R. I. Mashkovtsev¹^(a), A. I. Nepomnyashchikh², A. P. Zhaboedov² and A. S. Paklin²

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

^(a) rim@igm.nsc.ru

Received: 15 July 2020
Accepted: 7 December 2020

Abstract

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 $E'$ centers and their principal gvalues. In glasses the well-known paramagnetic centers $E'_{{\gamma}}$ , $E'_{{\alpha}}$ , $E'_{{\delta}}$ have been observed. In particular, thecenter $E'_{{{\alpha}1}}$ previously characterized as stableonly below $T\sim200\ \text{K}$ was observed as a stable variantat room temperature. In cristobalite the paramagnetic defects similar to the $E'_{{\gamma}}$ , $E'_{{{\alpha}1}}$ , $E'_{{\delta}}$ centers with slightly differentg values have been observed. From the observation of analogous $E'$ centers it was inferred that local structuresof glass and ${\beta}$ -cristobalite aresimilar.

PACS: 42.70.Ce – Glasses, quartz / 61.72.J- – Point defects and defect clusters / 61.72.jd – Vacancies

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