Abstract
A study of self-diffusion of ions in polycrystalline alkali halides of different particle size has been made as a function of temperature. In every case, the activation energy for self-diffusion of the ions is the same whether migration takes place in single crystals or polycrystals. For all compounds, with the exception of the salts of cesium, the speed of diffusion of the cation is the same for single or polycrystals. By contrast, the migration rate of the anions increases as the mean dimensions of the crystals comprising the polycrystalline agregates become smaller. However, in the case of the cesium salts the speed of diffusion of the cation is equally influenced by the presence of intercrystalline boundaries. It is possible to connect this increase in the speed of diffusion with the polarization of the ions. The more the ion is polarized, the greater the influence of the intercrystalline surfaces, irrespective of the polarity of the diffusion ion. An autoradiographic study confirms these conclusions.
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