Post-mortem EPR spectroscopy has been carried out to examine the radiation-induced Self-Trapped Hole (STH) in fictive temperature (Tf) treated Heraeus F300 silica. By repeating isochronal annealing cycles between 77 and 300 K, we observed that STH decreases with T but in a reversible manner. We evidenced a deviation from the Curie law for T > 70 K and suggest an interpretation based on the decrease of a “strain-assisted Trapped Holes” population by a reversible excitation of the trapped hole to a delocalized state with activation energy of 7.8 meV.

© 2018 The Author(s)

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