The diffusion constants of thallous (Tl+) and lead (Pb++) ions in potassium chloride

A. Glasner*, R. Reisfeld

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Diffusion constants of monovalent thallium and divalent lead into potassium chloride (in the low temperature range of the latter) were evaluated by a new spectral method. Results obtained are summarized in Table 5. Q, the activation energy of thallium ions, was found to be somewhat greater than that of the lead ions, the latter being about equal to the activation energy of the self-diffusion of the potassium ions. It is suggested that the comparatively small pre-exponential factor D0 for lead is due to its complexation with cation vacancies. The results obtained on heating the pressed disks differed widely from those with the mixed powders. The difference is accounted for by assuming a prevalence of "grain boundary diffusion" in the pressed disks, whilst "volume diffusion" is deactivated by the high pressure previously applied. The energy of activation with pressed disks is found to be about 10 per cent larger than the latent heat of fusion of the salts employed, namely thallium chloride and thallium sulphate.

Original languageEnglish
Pages (from-to)345-355
Number of pages11
JournalJournal of Physics and Chemistry of Solids
Volume18
Issue number4
DOIs
StatePublished - Mar 1961

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