The structure and properties of SnF2-SnO-P2O5 glasses

SnF2-SnO-P2O5 glasses with low glass transition temperature (T-g) were prepared in this paper. The effect of composition and melting time on the properties of these glasses was studied. X-ray diffraction (XRD) indicated that these prepared samples were glasses regardless of the composition and melting time. The properties of these glasses such as T-g, dilatometric softening temperature (T-f), thermal expansion coefficient (alpha) and density (rho) were tested. The structure of these glasses was studied by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric analysis (TGA). The glasses' structure and network dimension were supposed to play a critical role on the properties of the glasses. The fluorine and hydroxyl can decrease the network dimension of the glasses and thus decrease the T-g values. While, the oxidation of Sn2+ to form the Sn4+ could increase the network dimension of glasses and thus increase the T-g values. (C) 2015 Elsevier B.V. All rights reserved.