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            <title xml:lang="en">Amorphization of α-Quartz under Irradiation</title>
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                <title xml:lang="en">Amorphization of α-Quartz under Irradiation</title>
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                <title level="j">Journal de Physique III</title>
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              <p>The course of radiation induced damage produced in α-quartz by neutrons, ions, electrons or photons — commonly known as metamictization — has been re-analyzed by careful comparison of available experimental data. Specific interest was devoted to confront experimental metamict state features with current structural models. It comes out that the metamict state of irradiated quartz should exhibit some structural characteristics of the modulated structure proposed for vitreous silica. The metamictization process is consistent with a structural relaxation process of a highly defective quartz matrix. According to this new point defect analysis, structural relaxation should be triggered by a critical concentration of oxygen vacancy point defects likely to significantly lower the connectivity of the SiO2 network. Various experimental results are interpreted by incorporating the influence of the SiO2 crystalline polymorph and the influence of the nature of the irradiating particle to the point defect model.</p>
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