Thermal stability of a low Tg phosphate glass investigated by DSC, XRD and solid state NMR |
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Authors: | Gré gory Tricot,Bertrand Revel |
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Affiliation: | a Unité de Catalyse et de Chimie du Solide, UMR CNRS 8181, USTL-ENSCL, Université de Lille 1, Villeneuve d'Ascq 59652, Franceb Centre Commun de Mesures RMN de Lille 1, Université de Lille 1, Villeneuve d'Ascq 59652, Francec Bruker BioSpin GmbH-Solid state NMR applications, Silberstreifen, 76287 Rheinstetten, Germany |
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Abstract: | The thermal stability of a low Tg phosphate glass (Tg = 339 °C), formulated in the ZnO-Na2O-P2O5 system, is investigated in this contribution by Differential Scanning Calorimetry (DSC), X-Ray diffraction (XRD) and solid state Nuclear Magnetic Resonance (NMR). DSC measurement indicates a very important Tx − Tg value (197 °C) for the investigated composition compared to other low Tg phosphate glasses found in literature. XRD and 1D 31P solid state NMR were used to monitor the isothermal crystallization process occurring at 60 °C above Tg (400 °C). The mixture of phases formed after crystallization cannot be identified by XRD but 2D MAS-NMR experiment provides valuable information about the composition and the structure of the unknown sample. |
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Keywords: | Phosphate glasses Thermal stability Nuclear Magnetic Resonance Low Tg glasses |
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