Abstract
A pure typical nontronite from Czechoslovakia (Sampor) was analysed by the title techniques in the range 570–1070 K. The isothermal dehydroxylation of nontronite, recorded at 630–730 K, was described reasonably, in the decomposition range α=0.05–0.95, by diffusioncontrolled mechanismsD 3 andD 4. Application of the current solid-state reaction equations to the non-isothermal curve gave very poor results, except in the limited decomposition range α=0.10 to 0.55. A unimolecular mechanism equation (Fm 1) and also a second-order (SO) mechanism gave the best linearization of the curve. The activation energies estimated from the isothermal (D 3,D 4) and non-isothermal (F 1) experiments were 125 and 151 kJ·mol−1, respectively. Reduced time plots indicate the probable presence of a sequence of different mechanism for both techniques.
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