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Electrical Conductivity of (LiCl–KCl)eut.–SrCl2 Molten Mixtures

“…Molten alkali metal chlorides (MCl) are almost entirely ionic liquids. However, they also contain short-lived (with a lifetime of ∼10 –12 s) autocomplex anions of MCl n ( n – 1) (where n ≈ 4) type together with the M + elementary cations in the second coordination sphere. ,, In molten LiCl–KCl mixtures, the LiCl 4 3– complex ions are predominantly formed, and K + ions are in the second coordination sphere since the ionic potential of the Li + cation is much higher than the ionic potential of K + . The coordination number of Li + ≈ 4 in the LiCl–KCl eutectic was confirmed in ref by X-ray diffraction and molecular dynamics simulation.…”

“…The coordination number of Li + ≈ 4 in the LiCl–KCl eutectic was confirmed in ref by X-ray diffraction and molecular dynamics simulation. Relatively free K + cations in the second coordination sphere are the most mobile and their contribution to the melt electroconductivity is maximum. , …”

“…When SrCl 2 is added to the LiCl–KCl melt, the Sr 2+ cations with chlorine anions mainly form SrCl 4 2– complexes, ,,− which are somewhat stronger than Li + complexes. But since the difference in the ionic moments of Li + and Sr 2+ is small, strontium weakens the lithium complexes only slightly, and together they further reduce the mobility of the Cl – anions.…”