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The kinetics of Na + -isotopic exchange in zeolite A has been measured with a new experimental method at 21 °C. The exchange rate does not fit the classical function for the time-dependence of an ideal diffusion process. This confirms what had been observed earlier for the isotopic exchange of Rb-and Cs-ions 1  . It is assumed that, on the average, the initial by stronger bound cations start diffusing later than the other cations. Further it is assumed hat the distribution over the different lattice sites is temperature dependent. The solution of the appropriate diffusion equation yields the diffusion constant D along with the fraction of stronger bound cations and the probability b (sec -1 ) of escape of these cations from their lattice sites.

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Isotopenaustausch-Untersuchungen an Silicat-Ionenaustauschern VIII. Zur Deutung der uneinheitlichen Selbstdiffusion von Alkalimetallionen im synthetischen Zeolith A