Diffusion of thallous ions in potassium bromide, measured by the spectrophotometric method

A. Glasner*, A. Rejoan, R. Reisfeld

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The diffusion of thallous ions in potassium bromide, in the impurity range of temperatures, was measured by the spectrophotometric method.1 The energy of activation Q was found to be 23,500 cal/mole. The pre-exponential factor D0 varied with the experimental conditions, the effect being attributed to variations in the "face boundary", as indicated by experiments carried out under a reduced atmospheric pressure. From experiments with pressed pellets it was deduced that the original equation (containing the factor 62 to account for the "face boundary") used in calculating the diffusion constants D needed correcting as follows: D = (Et/E)2tl2/(10.3)2t. This gives for the diffusion of thallous ions in potassium bromide: DTl+ = 0.23 exp (-23,500/RT)cm2/sec. Previous values of D and D0 reported for the diffusion of thallous and lead ions in potassium chloride should similarly be divided by a factor of three.

Original languageEnglish
Pages (from-to)331-337
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume19
Issue number3-4
DOIs
StatePublished - May 1961

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