The ionic conductivity of dehydrated faujasite zeolite NaY and of the protonated form HY was determined experimentally using low-frequency impedance spectroscopy. The experiments were carried out in the frequency range of 10Hz to 10MHz and at temperatures between ambient and 634K. It was shown that the measured conductivity could be considered to be the sum of two terms. The direct-current term obeyed the Arrhenius law (figure 19), while the polarization term could be expressed as Aω8. The conduction phenomena, including polarization, were attributed to cation movements localized within super-cages. The parent zeolite NaY was more conductive than its protonated form HY.

Polarization Conductivity in Dehydrated Zeolites NaY and HY. A.Abdoulaye, S.S.Soulayman, G.Chabanis, J.C.Giuntini, J.V.Zanchetta: Microporous Materials, 1997, 8[1-2], 63-8