Glasses with molar composition of 17Na2O-7NaF - (8-x) GdF3 -.XLuF3-7Al2O3-61SiO2 (x ¼ 0e8) doped with 0.1 and 1 mol% Er3 þ.Were prepared by melting of analytical grade raw materials.Batches of 9 g were melted in covered corundum crucibles at.
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