Multi-nuclear magnetic resonance study of Na3 AlF6 AlPO4 molten and solidified mixtures
| Autor: | Aydar Rakhmatullin, František Šimko, G. M. Haarberg, Michaël Deschamps, Catherine Bessada, M. Keppert |
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| Rok vydání: | 2008 |
| Předmět: |
Quenching
Aluminium fluoride Chemistry Analytical chemistry Resonance chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Nuclear magnetic resonance Solid-state nuclear magnetic resonance Impurity Aluminium Magic angle spinning General Materials Science 0210 nano-technology Heteronuclear single quantum coherence spectroscopy |
| Zdroj: | Magnetic Resonance in Chemistry. 46:803-810 |
| ISSN: | 0749-1581 |
| Popis: | Phosphorus is one of the predominant impurities in the Hall-Heroult process for industrial aluminium production. The nature of the dissolved phosphorus species in the Na3AlF6AlPO4 system has been investigated by in situ high-temperature (HT) 19F, 23Na, 27Al, 17O, and 31P NMR. The combination of these experiments enables to define the presence of PO43-, AlF52- and (AlF4OPO3)4- anions in the melt, and then the formation of AlOP bonding. Melts solidified at different cooling rates were characterised using various solid-state NMR techniques including multiple quantum magic angle spinning (MQMAS), rotational echo double resonance (REDOR) and heteronuclear single quantum correlation (HSQC). The glass obtained by the rapid quenching of the hypereutectic melt has been carefully described in order to better understand the structure of the melt. |
| Databáze: | OpenAIRE |
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