Abstract
Density, molar volume, refractive index and molar refraction have been correlated with the structural units in Sb2O3–B2O3 glasses. It is proposed that these glasses include SbO3 pyramids, BO4 tetrahedra, symmetric- and asymmetric BO3 units. Concentration of these units could be determined by using literature data of the fraction of four-coordinated boron atoms. Each of the structural units contributes to the studied properties by a factor that remains the same overall the entire composition region. Probable existence of certain fraction of Sb5+ ions is discussed. It is deduced that the glasses can be treated by assuming the presence of SbO3 as the sole structural unit of Sb2O3.
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