Abstract

The experimental IR spectra and DTA curves of the binary semiconducting TeO 2–V 2O 5 glass system containing 0–50 mol% V 2O 5 have been investigated. The composition dependence of glass transition temperature suggested that the structure of this glass system changes at 20 mol% V 2O 5. The behavior of the theoretically calculated Poisson’s ratio and glass transition temperature have been analyzed in terms of the critical structure parameters of the network. The results showed that, at V 2O 5 concentration ≤20 mol% the glass continuous tellurite network and Te is 4-coordinated. Beyond 20 mol% V 2O 5, the network gradually changed to continuous vanadate network by the formation of VO 5-groups in addition to TeO 3 trigonal pyramids. The cation–anion bond vibration of VO bond has been calculated and interpreted on the basis of stretching force constant and reduced mass of the bond.

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