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Dielectric study of X type zeolites: evidence for cation correlated motions

1990; EDP Sciences; Volume: 87; Linguagem: Inglês

10.1051/jcp/1990870043

1878-7169

P. Tabourier, JC Carru, J.M. Wacrenier,

Solid-state spectroscopy and crystallography

we have previously pointed out the existence of correlated movements for the cations in X-type zeolites. In this paper, we intend to show from the analysis of the dielectric relaxation spectra that the correlation is limited to the cations present in a microscopic sphere (cluster) of radius "δ" .The value of "δ" is found to be at least 8Å for X-type zeolites containing essentially monovalent cations. As a consequence, dielectric relaxation, if performed in a sufficiently wide frequency range, can give information on zeolites at a microscopic level.