Abstract
The aim of structural characterization of the P2O5-V2O5-Bi2O3-B2O3 glassy system is to clarify the role played by the B2O3 as an unconventional network former in the structure of the investigated samples. Glass samples of the system were prepared by normal melt-quench technique at 1000°C. Studies such as Raman and FTIR spectroscopy, X-ray diffraction (XRD) and thermogravimetric-differential thermal analysis (TG-DTA) techniques were carried out on the glass system. The density and molar volume of glasses were determined in order to study their structure. It was observed that the density and molar volume of these glasses was decreased with increasing the concentration of B2O3. In addition, the oxygen packing density of glass samples have been also investigated. The glass transition temperature (Tg) also increased with increase in the B2O3 content in the glass. The Raman and infrared spectra of these glasses are recorded over a continuous spectral range (400-4000 cm-1) as an attempt to study their structure systematically. Raman and FT-IR spectroscopy data reveal that B2O3 and Bi2O3 behave as network formers and incorporated in the vitreous network as [BO3], [BO4], [BiO6], also V2O5 is incorporated in the vitreous network as [VO4] and [VO5].
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