Defect structure of glasses: Some outstanding questions in regard to vitreous silica

The defect structure of glasses is discussed primarily in the context of vitreous silicon dioxide (v-SiO2). Our current understanding of the nature of defects in v-SiO2 is reviewed on the basis of the available electron spin resonance data, and a unified picture of radiation-damage processes is formulated for high-purity silicas of both low- and high-OH contents. The critical role of hydrogen in the latter case is noted. Several presently outstanding questions relating to the optical spectra of defects in fused silica are highlighted with particular emphasis on data obtained in the fiber optic geometry. Some potential answers to these questions are suggested, and an attempt is made to chart the directions of the next 20 years' research in glass defect structure.

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