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
DEFIR
MatRMag
NAFMAT
OR2T
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
2021
ACL
doi
F.Šimko, A.Rakhmatullin, M.Korenko, C.Bessada
,
'Structural correlations and chemistry of the Na3AlF6 − SiO2 melt as an electrolyte for the solar grade silicon (SOG − Si) Electrowinning'
, J. Mol. Liq. 328 115453 (2021) doi:
10.1016/j.molliq.2021.115453
Molten system Na3AlF6 − SiO2 was examined by high temperature NMR. Further characterizations of the samples prepared by Rapid Solidification Processing (RSP) technique and by spontaneous solidification were performed by X–ray diffraction and solid state NMR. The high solubility of SiO2 in molten cryolite and the immiscibility phenomenon were observed. Using thermogravimetric analysis, weight losses were detected, which could be attributed to the formation of the volatile products. The results of the present study are the evidence that SiO2 reacts with molten Na3AlF6 under the formation of the volatile SiF4, non − volatile NaF, and alumino−silicate AlSi3O8− species. NMR spectroscopy coupled with diffraction−based methods was proved as a promising approach to obtain information about the structure and chemistry of this rather complex system.