Self-diffusion of Ag+ and Na+ in molten Ca(NO3)2-KNO3

B. J. Welch, Charles Angell

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

In order to explore the behaviour of diffusing ionic species in a molten salt in which non-Arrhenius behaviour of other transport properties is established, the diffusivities in dilute solution of Ag+ and Na+ in 38.1 mol% Ca(NO3)2+ 61.9 mol% KNO3 have been measured. For both ions limited radio-tracer diffusion coefficients, determined using a diffusion-out-of-capillary method, are reported. D(Ag+) has also been measured by chronopotentiometry, by which means the range and reliability of the measurements were considerably extended. Chronopotentiometric and tracer data agree within expected errors of measurement. Both ionic diffusivities show a non-Arrhenius temperature dependence which is indistinguishable in magnitude from that of the electrical conductance of the solvent melt.

Original languageEnglish (US)
Pages (from-to)1613-1623
Number of pages11
JournalAustralian Journal of Chemistry
Volume25
Issue number8
DOIs
StatePublished - 1972
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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