Abstract
Zinc based phosphate-silicate glasses with a molar composition of (0.9-x)NaPO3-0.1SiO2-xZnO (0 ≤ x ≤ 0.3 mol%) were successfully synthesized by melt quenching technique. The amorphous state of the glass series was checked using X ray diffraction (XRD).The variation of density, molar volume and refractive index were correlated to increase in the compactness of the vitreous network when ZnO oxide is progressively introduced.The Fourier transformed infrared and Raman spectroscopy investigations revealed that the glass network depolymerized with the increase of ZnO content. This result induces the disruption of metaphosphate chains (Q2) suggesting the formation of phosphate dimers (Q1).The DSC analysis shows the increase of Tg and Tc with the incorporation of ZnO oxide is due to the development of a more compact network structure.Optical properties were investigated by means of UV–visible spectroscopy. The variation of the band gap energy (Eopt) of the glass series were attributed to the increase of the non bridging oxygen (NBO) resulting from the disruption of the metaphosphate chains.
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