Add time:08/26/2019         Source:sciencedirect.com

Raman spectroscopic study on Oxyfluoro Vanadate glasses containing various proportions of lithium fluoride and rubidium fluoride was carried out to see an effect of mixture of alkali on vanadium–oxygen (VO) bond length. Glasses with a general formula 40V2O5 − 30BaF2 − (30 − x) LiF − xRbF (x = 0–30) were prepared. Room temperature Raman spectra of these glass samples were recorded in back scattering geometry. The data presented is in “reduced Raman intensity” form with maximum peak scaled to 100. We have used υ = Aexp(BR), where A and B are fitting parameters, to correlate the bond length R with Raman scattering frequency υ. We observed that variation in bond length and its distribution about a most probable value can be correlated to the alkali environment present in these glasses. We also observed that all rubidium environment around the network forming unit is more homogenous than all lithium environment.

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