A 31P-NMR study of borophosphate glasses |
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| Institution: | 1. Laboratory of Inorganic Materials, Joint Workplace of the Institute of Chemical Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic and the Institute of Rock Structure and Mechanics of the ASCR, v.v.i., V Holešovičkách 41, 182 09 Prague 8, Czech Republic;2. Republic Production Technology Center, Asahi Glass Co, LTD., Japan;1. School of Material Science and Engineering, University of Jinan, Jinan 250022, People''s Republic of China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, People''s Republic of China;1. Center of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia;2. Electron Microscope and Thin Films Department, Physics Division, National Research Centre, Dokki, Giza, Egypt;3. Mechanical Engineering Department, Faculty of Engineering, King Abdulaziz University, Jeddah, Saudi Arabia.;1. Département des sciences appliquées, Université du Québec à Chicoutimi (UQAC), 555, boulevard de l''Université, G7H 2B1 Chicoutimi, Québec, Canada;2. Elettra – Sincrotrone Trieste, S.C.p.A. S.S. 14 km 163.5 in Area Science Park, 34149 Basovizza, Trieste, Italy;3. National Institute for Nuclear Physics (INFN), Padriciano 99, 34149 Trieste, Italy;4. Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;5. Department of Earth and Planetary Sciences (EPS), McGill University, 3450 University Street, H3A 0E8 Montreal, Québec, Canada |
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| Abstract: | It is shown that 31P nuclear magnetic resonance (NMR) spectroscopy with magic angle spinning (MAS) discriminates among different types of PO4 units occurring in borophosphate glasses. The isotropic 31P chemical shift of the PO4 increases by nearly 70 ppm in going from the “branching unit,” neutral and covalently bonded, to the “monomeric unit,” which carries a −3 nominal charge. By using both stationary and MAS 31P spectra, we also obtain the average values, and distribution widths, for chemical shift anisotropy and the asymmetry factor of PO4 units occurring in vitreous borophosphates. Analysis of these NMR spectra provides detailed information about the short-range order in these glasses. It is also shown that the 31P-NMR-MAS technique may contribute significantly to phase separation and crystallization studies of phosphorus-containing glasses. |
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