Abstract
Absorption of multicomponent alumino-phosphate glasses containing manganese up to 20 mol%, irradiated with X orγ-rays or additively colorated and annealed at 400–450 °C, has bsen measured. After irradiation an absorption band at about 240 nm (D band) appeared. Its intensity increased with increasing radiation dose. It did not occur in additively coloured glasses. On the other hand, the D band arose, as rule, in as-prepared glasses under oxidation conditions. It is, therefore, assumed that the nature of the D band would be the same in both cases. The model of the defect and the mechanism of the formation of this defect is proposed and the role of the Mn concentration is demonstrated.
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