Conditions Extrêmes et Matériaux : Haute Température et Irradiation
CEMHTI - UPR3079 CNRS
utilisateur non identifié |
Login
Home
Directory
Publications
Research
Facilities
Jobs - News
Access
Past members
CERAM - M.Allix
DEFIR - P.Desgardin
MatRMag - V.Montouillout
NAFMAT - C.Ania
OR2T - O.Rozenbaum
Common Actions
High-Temperatures Facility
Particles Beams Facilities
Vibr. Spectroscopies and Planex
NMR Facility
Softwares
National and European Facilities
all the instruments
Pelletron
Positons
Performances
IBA Techniques
Implantation and Irradiation
IR-RMN in Infranalytics
PANACEA Eu
850 MHz
Diffusion
NMR
dmfit NMR
focus (IR Optics)
Levitation
Electron Microscope
XRay and Neutrons
NMR
IR emission
RAMAN
Accelerators
RAMAN in situ
RAMAN high temp.
RAMAN imaging
News@CEMHTI
Jobs@CEMHTI
Seminars@CEMHTI
View CEMHTI Publication
Return to publication search...
Ask for a reprint
email :
I am not a bot ;-)
* Give your email
2009
ACL
doi
C.Bessada, A.Rakhmatullin, A.L.Rollet, D.Zanghi
,
'High temperature NMR approach of mixtures of rare earth and alkali fluorides : an insight into the local structure'
, J. Fluorine Chem. 130 45-52 (2009) doi:
10.1016/j.jfluchem.2008.07.010
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 Lanthanide. 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 Alk-LnF3 systems by NMR and EXAFS spectroscopy.