Abstract
Eight pure smectite samples (six montmorillonites and two nontronites) were analysed by DTA and TG. Seventeen derivatives of different exchangeable cations were prepared from one of these montmorillonites and thermally analysed. Montmorillonites show higher dehydroxylation temperatures than nontronites. Dehydration of the smectite derivatives studied gives DTA peaks markedly differing in temperature, intensity, width and number of peaks, depending on the type of exchangeable cation. TGA curves for the derivatives studied are also given.
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