A new stable radiation center in quartz

Bershov, L. V.; Marfunin, A. S.; Speranskiy, A. V.

doi:10.1080/00206818209466993

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…For example, centre #1 of Mashkovtsev et al (1978) is closely comparable to several defects reported by Samoloivich et al (1969), Bershov et al (1978) and Maschmeyer and Lehmann (1983). Discrepancies among these studies include:…”

Section: Introductionsupporting

confidence: 83%

Radiation-induced defects in quartz: a multifrequency EPR study and DFT modelling of new peroxy radicals

Pan¹,

Nilges²,

Mashkovtsev³

2009

Mineral. mag.

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A natural quartz, annealed first at 800°C and then irradiated with a 3.5 MeV electron beam, has been investigated by single-crystal electron paramagnetic resonance (EPR) spectroscopy at X- and W-band frequencies from 110 K to 298 K. The W-band EPR spectra allow better separation of two previously reported radiation-induced defects (D and E) and improved determinations of their spin Hamiltonian parameters. These defects have similar g tensors with the gmax axes approximately along an O—O pair and gmin axes perpendicular to the short Si—O bonds, but different 27Al hyperfine structures. Centre E is also characterized by a 29Si hyperfine structure (A/geβe = ~0.4 mT). These spin Hamiltonian parameters, together with results from density functional theory (DFT) calculations, suggest centre E to be a new variant of peroxy radicals in quartz, whereas a peroxy radical model for centre D remains tentative. Thermal stabilities and decay kinetics of centres D and E have been investigated by use of isochronal and isothermal annealing experiments on a neutron-irradiated quartz and six smoky quartz crystals in druses from a U deposit.

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