Thermodynamic data on cation exchange processes in clinoptilolite involving NH4, Na, K, Ca and Mg cations were obtained. The data were analyzed, using the Barrer-Barri-Klinowski (table 17) and other methods, to yield interdiffusion coefficients.

Cation Diffusion in the Natural Zeolite Clinoptilolite. A.Dyer, K.J.White: Thermochimica Acta, 1999, 340–341, 341–8