Structure characterizations of SnF2-WO3-B2O3-P2O5 glass with ultra low transition temperature

Tinfluride-tungsten-borophosphate (SnF2-WO3-B2O3-P2O5) (SWBP) glass was prepared for sealant material by the traditional melt-quenching method. Full characterization has been carried out by FTIR and Raman spectra, as well as by the XPS spectroscopies, concluding that the non-bridging oxygen existed extensively in network, the ratio of non-bridging oxygen (NBO) to bridging oxygen (BO) was 16:1, which was considered to be sign of a stable structure. Meanwhile, the Sn(IV) to Sn(II) was 7:3, and the F-Sn to F-P was 7:3. The distinct structure lead to unique properties. Differential scanning calorimetry (DSC) of glass showed that the transition temperature was below 150 degrees C, and no crystalline points were found. Relative to chemical stability, the glass exhibited remarkable water durability and have a weight loss about 0.5 wt% in immersing measurements. In addition, proposed glass powder showed superior liquidity on metal substrate at 300 degrees C, which provides new ideas for the development of lower temperature and environmentally friendly of sealant materials. (C) 2019 Elsevier B.V. All rights reserved.