Abstract
It is shown that silica gel-glass doped with Ce and prepared in hard oxidative conditions is characterised by a relatively intense and broad absorption band at λ∼550 nm. With annealing of the glass in hydrogen, the band is intensified at the beginning of the process and disappeared at the end. This band appearance is explained by the formation of clusters representing complex groupings of Ce4+–O–Ce3+ and Ce4+–O–Fe3+ with exchange interaction between their metal ions. An essential attenuation of the band is noted with co-doping the glass with Nd, Tb, Er and Yb ions which substitute the Ce3+ and Ce4+ ions in the indicated groupings.
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