Abstract
A conversion process, from diamagnetic to paramagnetic defects in natural silica samples, has been pointed out by combining measurements of optical and electron paramagnetic resonance spectroscopy. The conversion is induced by y irradiation and its rate has been found to depend on the OH content of a given silica type. The mechanism can be explained by a structural model in which the native optically active defect is a twofold coordinated Ge center and the β induced one is the so called H(II) center. The latter defect has been found to be unstable, as thermal treatments of the irradiated samples, at relatively low temperatures (T ≤ 430 K), restore completely the native concentration of diamagnetic defects.
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Gelardi, F., Agnello, S. (2000). GAMMA RAYS INDUCED CONVERSION OF NATIVE DEFECTS IN NATURAL SILICA. In: Pacchioni, G., Skuja, L., Griscom, D.L. (eds) Defects in SiO2 and Related Dielectrics: Science and Technology. NATO Science Series, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0944-7_9
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DOI: https://doi.org/10.1007/978-94-010-0944-7_9
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