Summary
Self-diffusion measurements have been made on liquid indium and tin over a wide range of temperatures, and a small but systematic deviation from the ordinary Arrhenius equation has been detected. After the customary discussion of the Stokes-Einstein and Eyring equations, new expressions are worked out in the quasi crystalline picture of the liquid state following the solid state treatment of the diffusion processes. It is then shown how the deviations from the Arrhenius equation are accounted for by a direct interchange mechanism of nearest neighbours, due to a ring movement of two atoms.
Riassunto
Sono state effettuate misure di autodiffusione in stagno ed indio liquidi in un largo intervallo di temperatura, ed è stata rilevata una piccola ma sistematica deviazione dalla ordinaria equazione di Arrhenius. Dopo la usuale discussione in termini delle equazioni di Stokes-Einstein e di Eyring, sono ricavate nuove espressioni nell’approssimazione quasi cristallina dello stato liquido, seguendo l’analoga trattazione dei processi di diffusione nello stato solido. Viene allora dimostrato come della deviazione dalla equazione di Arrhenius si possa rendere conto mediante un meccanismo di scambio di atomi vicini, con un moto ad anello di due atomi.
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References
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Careri, G., Paoletti, A. Self-diffusion in liquid indium and tin. Nuovo Cim 2, 574–591 (1955). https://doi.org/10.1007/BF02826516
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DOI: https://doi.org/10.1007/BF02826516