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High temperature NMR approach of mixtures of rare earth and alkali fluorides: An insight into the local structure
- Source :
- Journal of Fluorine Chemistry. 130:45-52
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- In situ high temperature nuclear magnetic resonance in molten fluoride mixtures gives some structural picture of the complexes existing in the melt, i.e. of their nature and relative proportion. Thanks to the development of a laser heating system associated with a close crucible in boron nitride, we can describe experimentally the evolution of these complexes from the anions and the cations point of view. By 19F NMR, we have shown the existence of three kinds of fluorine atoms depending on the composition: free fluorine like in pure LiF (non-bonded), bridging fluorine in melts rich in LnF3 in addition with terminal fluorine singly bonded to one rare earth. Data obtained by NMR spectroscopy are also combined with EXAFS measurements, again thanks to a specific development of the sample holder adapted with molten fluorides and high temperature. This study is a part of our systematic investigation of the different AlkāLnF3 systems by NMR and EXAFS spectroscopy.
- Subjects :
- Extended X-ray absorption fine structure
Chemistry
Organic Chemistry
Inorganic chemistry
Crucible
chemistry.chemical_element
Nuclear magnetic resonance spectroscopy
Fluorine-19 NMR
Alkali metal
Biochemistry
Inorganic Chemistry
chemistry.chemical_compound
Boron nitride
Fluorine
Environmental Chemistry
Physical chemistry
Physical and Theoretical Chemistry
Fluoride
Subjects
Details
- ISSN :
- 00221139
- Volume :
- 130
- Database :
- OpenAIRE
- Journal :
- Journal of Fluorine Chemistry
- Accession number :
- edsair.doi...........9065669f64dcd1d8cbeeed2b231d0cb9