4.3 Article

Structural characterization and chemistry of LiF-AlF3 melts with addition of MgO and MgF2

Journal

JOURNAL OF FLUORINE CHEMISTRY
Volume 241, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2020.109678

Keywords

System MgO/MgF2-LiF-xAlF(3); Molten salts; High temperature and solid state NMR; Nuclear reactors

Funding

  1. [323282]

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The LiF-AlF3 system with additions of MgO and MgF2 was investigated using O-17, Mg-25, Al-27 and F-19 in-situ high temperature NMR techniques. The study found evidence of a chemical reaction between MgO and the salt in the melts, providing insight into the speciation and evolution of the system.
The LiF-AlF3 system with additions of MgO and MgF2 has been studied by O-17, Mg-25, Al-27 and F-19 in-situ high temperature NMR, ex-situ solid state NMR and X-ray powder diffraction for a wide range of compositions. The description of the speciation in the melts and its evolution with different operational parameters such as temperature, time and composition were obtained for MgF2/MgO-(1-x)LiF-xAlF(3) for x = 14.5, 25 and 35.5 mol% systems. The evolution of the signals provides evidence of a chemical reaction between the MgO and the salt.

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