Dynamic radiation-induced effects in chalcogenide vitreous compounds

The experimental results on time degradation of radiation-induced darkening effects in vitreous chalcogenide semiconductors of ternary stoichiometric (As2S3)y(GeS2)1−y (y: 0.1, 0.2, 0.4, 0.6) and non-stoichiometric (As2S3)x(Ge2S3)1−x (x: 0.1, 0.2, 0.4, 0.8) systems with a variation of the average co-ordination number, Z, are discussed. It is established that adequate model for the quantitative description of these effects can be developed at the basis of bimolecular relaxation function (RF) proper to annihilation of specific structural defects in the form of oppositively charged atoms with various co-ordinations. The observed features of the investigated dynamic radiation-optical changes in these glasses are explained by compositional dependences of their atomic compactness, as well as covalent bond statistics.