Structural and spectroscopic studies of V2O5 incorporated lithium-bismuth-boro-tellurite glass ceramics

Abstract

The effect of dopant concentration on the spectroscopic characteristics of multi-component glass ceramics with the composition 25Li2O-(15-x) Bi2O3-45B2O3-15TeO2-xV2O5(x = 0, 2, 5, 7, 10 mol %) fabricated using traditional melt-quenching process is shown in this study. The prepared glass ceramics were extensively characterised using XRD, FTIR, EPR, etc. The x-ray diffraction (XRD) study reveals that the glasses were semi-crystalline (ceramic) in nature. In addition, Rietveld refinement was used to investigate the crystalline component in the glass network that is responsible for a ceramic nature of the prepared samples. Structural results reveal that the Bi2O3 was found in the crystalline cubic structure of 2 and 5 mol% V2O5 doped glass systems. In other words, the incorporation of V2O5 into the host glass matrix alters the structure of the glass, resulting in semi-crystallization of glass samples. Surprisingly, crystalline structure of LBBTV samples decreases as the V2O5 concentration was increased, owing to the stabilizing of the glass structure at higher doping concentrations. Physical parameters for instance, molar volume is in accordance (decreases till 5 mol % and then increases) with the XRD data. As the vanadium content increases, the FTIR spectra indicate a drastic shift in borate units. EPR spectra of glass ceramics and glasses show resonance signals typical of VO2+ ions.