Abstract
A series of Germania-lead-vanadium pentoxide glasses with x=5, 10 and 15 mol% were prepared by melt quenching technique and they were characterized by X-ray diffraction (XRD), Differential scanning calorimetry (DSC), Fourier Transform Infrared (FT-IR) and Electron Spin Resonance (ESR) techniques. X-ray diffraction results reveal that all samples are perfect amorphous in nature. Differential scanning calorimetry results indicate that the substituent GeO2 is replacing PbO in the glass network in such a way that the eutectic composition is maintained. The Fourier Transform Infrared spectra characterized V=O stretching frequency around 968 cm-1 upto 15 mole% and interestingly the Electron Spin Resonance studies did not yield well resolved hyperfine structure due to exchange broadening which varyies with nature of dopant. The Hruby parameter (Kg) for this glass system has been evaluated and reported.
Highlights
Glasses having Transition Metal Ions (TMIs) such as vanadium or iron ions show a semiconducting behavior.Mott (1968; 1967) found that the dc electrical conductivity of semiconducting oxide glasses is due to small polaron hopping from a low valance state to a high valance state one of a Transition Metal Ion (TMI) (e.g.from V4+ to V5+)
The X-ray diffractograms of the present glass system (x = 5, 10, 15 mol%) annealed at 150°C are shown in Differential scanning calorimetry patterns up to x = 15 mole% there is only one endothermic peak corresponding to the melting point
This indicates that the substituted samples behave like the eutectic composition up to x = 15 mole%, the endothermic peak corresponding to melting exhibits a small shoulder when the amount of GeO2 substitution exceeds 15 mole%
Summary
Glasses having Transition Metal Ions (TMIs) such as vanadium or iron ions show a semiconducting behavior.Mott (1968; 1967) found that the dc electrical conductivity of semiconducting oxide glasses is due to small polaron hopping from a low valance state to a high valance state one of a Transition Metal Ion (TMI) (e.g.from V4+ to V5+). Fourier Transform Infrared spectra characterized V=O stretching frequency around 968 cm−1 upto 15 mole% and interestingly the Electron Spin In order to understand the devitrification tendency and thermal stability of the glasses, glass forming tendency values Kg are calculated using the equation given below (Kozmidis-Petrović, 2010): temperature for both the vitreous and non-vitreous samples in order to study the effect of a different metal oxide substitution in the place of PbO in the lead metavanadate glass systems using SHIMADZU Fourier
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