Structure and properties of MoO3-containing zinc borophosphate glasses |
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Authors: | Ji?í ?ub?ík Ladislav Koudelka Petr Mo?ner Lionel Montagne Bertrand Revel Ivan Gregora |
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Institution: | 1. Department of General and Inorganic Chemistry, University of Pardubice, Nam.Cs.legii 565, 53210 Pardubice, Czech Republic;2. Unité de Catalyse et Chimie du Solide UMR CNRS 8181, University of Science and Technologies of Lille, National Chemistry School of Lille, 59655 Villeneuve d’Ascq, France;3. NMR Center of the University of Lille, 59655 Villeneuve d’Ascq, France;4. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Prague, Czech Republic |
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Abstract: | ZnO–B2O3–P2O5 glasses doped with MoO3 were investigated in the series (100?x)0.5ZnO–0.1B2O3–0.4P2O5]–xMoO3, where bulk glasses were obtained by slow cooling in air within the compositional region of 0 ? x ? 60 mol% MoO3. The incorporation of MoO3 into the parent zinc borophosphate glass results in a weakening of bond strength in the structural network, which induces a decrease in chemical durability and glass transition temperature. Raman spectra reflect the incorporation of molybdate groups into the glass network of the studied glasses by the presence of the polarized vibrational band at ≈976 cm?1 ascribed to the MOx symmetric stretching vibrations and the depolarized band at ≈878 cm?1 ascribed to the Mo–O–Mo stretching vibration. The incorporation of molybdate units into the glass network results in the depolymerization of phosphate chains and the formation of P–O–Mo bonds, as reflected in Raman and 31P NMR spectra. According to the 11B MAS NMR spectra, tetrahedral B(OP)4?x(OMo)x units are formed in the glasses, whereas only a small amount of BO4 units is converted to BO3 units in the MoO3-rich glasses. |
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