Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A = Li, Na, K and Rb) molten salts

  • Rollet A
  • Bessada C
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Abstract

The local structure of molten CsF-AF (A = Li, Na, K and Rb) has been studied by high temperature Nuclear Magnetic Resonance (NMR) spectroscopy. The 19F and 133Cs chemical shifts have been measured as a function of the molar fraction of CsF. 19F chemical shift varies linearly with composition while 133Cs chemical shift presents a break around the eutectics composition. Furthermore, in molten CsF-LiF at high CsF concentration, 133Cs chemical shift is nearly constant. The evolutions of 19F and 133Cs chemical shifts versus CsF-AF composition have been interpreted as a signature of dynamical local scale distribution heterogeneities.

Author-supplied keywords

  • Chemical shift
  • High temperature NMR
  • Molten alkali fluoride
  • Molten salt

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Authors

  • Anne Laure Rollet

  • Catherine Bessada

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