Thermal study of vermiculites and mica-vermiculite interstratifications |
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| Authors: | A Justo J L Pérez-Rodríguez P J Sánchez-Soto |
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| Affiliation: | 1. Instituto de Ciencia de Materiales, Centro Mixto Consejo Superior de Investigaciones Cientificas-Universidad de Sevilla, P. O. Box 1115, 41080, Sevilla, Spain
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| Abstract: | Simultaneous DTA-TG has been carried out on a set of natural vermiculite samples. Based on their dehydration behaviour the samples can be divided in two groups: (a) those with DTA endothermic peak temperatures at 140°–150°C and 240°–270°C (pure vermiculties) and (b) those with peak temperatures at 95°–115°C (vermiculite with mica or mica-vermiculite interstratifications). The low temperature at which the endothermic effect in group (b) appears is discussed on the basis of dilution due to the inert layers of mica, differences in chemical composition, and lowering of interlamellar water bond energy. |
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