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Silica gel glasses obtained by vitrification in air or an H2:Ar gas mixture of xerogels doped with Sm, Al, and Ba were studied. Impurity hexagonal and tetragonal SiO2 crystallites and tetragonal SmSi2 crystallites could form during the synthesis. Sm was incorporated into the glass simultaneously in oxidation states 3+ and 2+ if reducing synthetic conditions were used. Sensitization of Sm2+ luminescence...
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