Abstract
AbstractSixteen montmorillonites (8 normal and 8 abnormal using DTA dehydroxylation criteria) from the Gurasada bentonite deposits, Romania, were investigated by ESR. The spectra showed two features: ag= 4·3 signal attributed to isolated Fe3+ions and a broad resonance withg∼ 2·0 which was interpreted as arising from exchange interactions between clusters of Fe3+ions. Additional experiments suggested that the latter resonance could have a structural component. The line-shape of the two resonances varied between normal and abnormal montmorillonites, indicating that the distribution of the Fe3+ions between internal phase (montmorillonite lattice) and external phase (montmorillonite surface) was different for the two varieties.
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