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Calcium borotellurite glasses, doped with 0.25 mol.% of Sm2O3, were prepared to investigate the influence of TeO2 content in their properties. The samples were prepared by a melt-quenching method, with TeO2 varying from 9 mol.% to 51 mol.% and characterized by volumetric density, optical absorption, refractive index, luminescence and radiative lifetime. The results are discussed as a function of TeO...