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The influence of alumina on vitrification, crystallization, volati-lization of the charge components, absorption and luminescence spec-tra in lead fluoroborate glasses doped Nd3+, Eu3+, Er3+ under the con-ditions of synthesis in platinum and corundum crucibles with the addi-tion of up to 30 mol.% Al2O3 in the charge is studied. It is established that the most optically high-quality glasses are obtained with an alu-minum content of 10 at.%.