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Thermally reversible γ-ray-induced redox reaction between substitutional iron and aluminum impurity centers in a silica glass

Published online by Cambridge University Press:  31 January 2011

Radhaballabh Debnath
Radhaballabh Debnath*
Affiliation:
Central Glass and Ceramic Research Institute, Calcutta 700 032, India
*
a)e-mail: debnathr@hotmail.com
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Abstract

The magnetic properties of the substitutional iron and aluminum impurity centers in a sintered Vycor silica glass were studied before and after 1.1–1.3 MeV γ irradiation. Observation of two overlapping spin resonances (g ∼ 4.20–4.28) in the spectra of both the irradiated and preirradiated glasses indicated the existence of two types of tetra coordinated substitutional iron centers of the [FeO4−/Na+]0 type. The intensity of these electron-paramagnetic resonance (EPR) signals decreased upon g irradiation of the glass with concomitant generation of aluminum hole center [AlO4]0, which was manifested by the occurrence of a new six-line EPR signal with g 4 2.009, while thermal annealing of these aluminum oxygen hole centers restores the intensity of the iron centers almost to their preirradiation level. This result suggests that if not the whole, a major fraction of the electrons released in the process of g-ray-induced hole trapping at the Al site are captured by the substitutional iron centers. The electron traps, thus formed, are quite stable and can be deactivated by thermal stimulation.

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Articles
Information
Journal of Materials Research , Volume 16 , Issue 1 , January 2001 , pp. 127 - 131
Copyright
Copyright © Materials Research Society 2001

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