期刊
COMPTES RENDUS CHIMIE
卷 13, 期 4, 页码 399-404出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2009.11.005
关键词
PFG NMR; Molten salt; Molten fluoride; Self-diffusion; High temperature; Cryolite
资金
- GdR PARIS
- PCR ANSF
We have developed a new experimental setup for the measurement of self-diffusion coefficients at high temperature (up to 1500 K) in corrosive liquids. It is based on pulsed field gradient NMR using a 10 mm liquid probe with two channels F-H/X modified and coupled with laser heating. The values obtained thanks to this setup are in good agreement with the available data obtained using the reference method, i.e., the capillary method. We present here results on (19)F, (7)Li, (23)Na, (27)Al in molten fluorides. In alkali fluoride mixtures, the self-diffusion coefficients depend weakly on the composition (nature and concentration of the different alkali) but mainly on temperature. In cryolite (Na(3)AlF(6)), the diffusion evidences AlF(x)(3-x) species. (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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