Selfdiffusion in single crystals of sodium iodide. (Ionic conduction)

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Abstract
The conductivity of pure NaI and NaI+CdI2 and the 22Na+ diffusion in pure NaI has been measured as a function of temperature. From a comparison of the diffusion results obtained by the two methods it is concluded that the point defects in NaI are of the Schottky type and that the cation selfdiffusion, which is the dominant contribution to the conductivity, occurs via isolated vacancies. The conductivity results for the Cd2+ doped crystals have been analysed in terms of the simple theory of ionic conductance. This analysis gives values of 2.27 eV, 0.47 eV and 0.51 eV for the enthalpies of Schottky defect formation, cation vacancy migration and Cd2+-cation vacancy association respectively.

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