Short-range order in fused salts. I. Coordination states of nickel(II) in molten zinc chloride-potassium chloride mixtures

C. A. Angell, D. M. Gruen

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Absorption spectra of Ni(II) in molten KCl-ZnCl2 mixtures have been obtained as a function of temperature and of melt composition in the range 4000-40,000 cm-1. Spectra have been obtained over the entire composition range from pure liquid ZnCl2 to pure liquid KCl. The extremes in the temperature range studied were 250 to 900°. Observed spectral changes have been interpreted to indicate the existence of (a) a two-species equilibrium involving Ni(II) in octahedral and distorted tetrahedral sites, and (b) transformation by a continuous distortion mechanism of an octahedral Ni(II) species to a highly distorted tetrahedral species. The effect of Cl- polarization by Zn(II) and of volume changes on the coordination behavior of Ni(II) is discussed. A simple technique for handling and weighing small samples of highly hygroscopic materials is described.

Original languageEnglish (US)
Pages (from-to)1601-1609
Number of pages9
JournalJournal of physical chemistry
Issue number5
StatePublished - Dec 1 1966


ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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