Issue 39, 2021

Probing the ionic structure of FLiNaK–ZrF4 salt mixtures by solid-state NMR

Abstract

In this study, by applying 19F, 23Na and 7Li high-resolution NMR methods, the evolution of the [ZrxFy]4xy local ionic structures in FLiNaK–ZrF4 salt mixtures were elucidated. K3ZrF7, Na3ZrF7 and Na7Zr6F31 crystal phases were identified when the melt salts were being solidified. The distribution of these [ZrxFy]4xy species was dependent on the content of ZrF4 in FLiNaK eutectic salts. Moreover, K3ZrF7 phase transition from an orthorhombic lattice into a disordered cubic lattice was clarified, thereby causing dynamics of the coordinated F ions to be reduced and the well-ordered crystal lattices to be destroyed. These mentioned results provide a further insight into the Zr–F based ionic structure and the formation of the disordered Zr–F structure in ZrF4-based eutectic salts.

Graphical abstract: Probing the ionic structure of FLiNaK–ZrF4 salt mixtures by solid-state NMR

Supplementary files

Article information

Article type
Paper
Submitted
15 6 2021
Accepted
30 6 2021
First published
06 7 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 23846-23850

Probing the ionic structure of FLiNaK–ZrF4 salt mixtures by solid-state NMR

R. Lan, Y. Liu, L. Han, J. Yang, H. Yin, M. Ge, X. Fu, H. Liu and Y. Qian, RSC Adv., 2021, 11, 23846 DOI: 10.1039/D1RA04629B

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