Vibrational spectral analysis of structural modifications of Cr2O3 containing oxyfluoroborate glasses

Abstract Infrared and Raman spectra of oxyfluoroborate glasses of the compositions 20CaF 2 –20 ZnO–(60-x) B 2 O 3 -x Cr 2 O 3 with 0 ≤ × ≤ 0.10 mol% (x = 0, 0.02, 0.04, 0.05, 0.06, 0.07, 0.08 and 0.1) have been analyzed in order to explain the role of Cr 2 O 3 on the structure of these glasses. Density, molar volume, oxygen molar volume and oxygen packing density are determined to explain the packing of the atoms in the glasses. From these studies, the existence of different borate groups like di-, tri-, tetra-, penta-, ortho-, pyro- and metaborates in these glasses is established. With the increase in the concentration of Cr 2 O 3 up to 0.06 mol%, conversion of BO 3 units into BO 4 units and above this mole fraction the reconversion of BO 4 units into BO 3 units is observed. The breaking and reforming of the boroxol ring is explained from the Raman spectral studies of these glasses.

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