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Multi‐nuclear magnetic resonance study of Na 3 AlF 6 AlPO 4 molten and solidified mixtures
Author(s) -
Keppert M.,
Rakhmatullin A.,
Simko F.,
Deschamps Michael,
Haarberg G. M.,
Bessada C.
Publication year - 2008
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.2248
Subject(s) - chemistry , heteronuclear molecule , impurity , aluminium , solid state nuclear magnetic resonance , magic angle spinning , analytical chemistry (journal) , quenching (fluorescence) , nuclear magnetic resonance spectroscopy , nuclear magnetic resonance , fluorescence , stereochemistry , organic chemistry , physics , quantum mechanics
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 Na 3 AlF 6 AlPO 4 system has been investigated by in situ high‐temperature (HT) 19 F, 23 Na, 27 Al, 17 O, and 31 P NMR. The combination of these experiments enables to define the presence of PO 4 3− , AlF 5 2− and (AlF 4 OPO 3 ) 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. Copyright © 2008 John Wiley & Sons, Ltd.