Influence of cation coordination numbers on transport properties of ionic liquid mixtures

Anselmo Elias, C. Austen Angell

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Abstract

We test a conjecture, based on spectacular differences between FeCl3-based and CrCl3-based solutions, that transport properties in molten salt solutions are conditioned by the coordination number that the highest z/r cation adopts in the solution. To do this we study a case in which change of anion type dictates a change of cation coordination number from 4 to 6. We use additions of fluoride ion to a molten chloride solution containing Co2+ in one case and Ni2+ in a second, and compare the ionic conductivities with those of isostoichiometric solutions containing only chloride anions. In the presence of fluoride both solutions show lower conductivities than in the all-chloride equivalent, consistent with formation of some MCl64- sites and the difference is greater for Ni(II) solutions, consistent with the greater preference of the d8 ion for octahedral sites.

Original languageEnglish (US)
Pages (from-to)5858-5860
Number of pages3
JournalJournal of physical chemistry
Volume92
Issue number21
DOIs
StatePublished - Jan 1 1988
Externally publishedYes

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ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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