Abstract
The kinetics of the K+⇌ Na+ exchange in Na2O·3SiO2 glass at 350°C were studied. The distribution of K in the glass specimens after exchange in molten KNO3 was determined with an electron microprobe. The calculated interdiffusion coefficients, which varied with the local composition in the glass, were compared with those obtained using the Nernst‐Planck equation and Fleming and Day's self‐diffusion data for xNa2O. (1‐x)K2O·3SiO2 glasses. Deviations of the observed interdiffusion coefficient from the Nernst‐Planck formula were noted. These deviations are explained on the basis of changes in the average size of the alkali ion sites and in the strain energy that occur during ion exchange.
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