Thermodynamic properties of anhydrous smectite MX-80, illite IMt-2 and mixed-layer illite–smectite ISCz-1 as determined by calorimetric methods. Part I: Heat capacities, heat contents and entropies - BRGM - Bureau de recherches géologiques et minières Access content directly
Journal Articles Geochimica et Cosmochimica Acta Year : 2007

Thermodynamic properties of anhydrous smectite MX-80, illite IMt-2 and mixed-layer illite–smectite ISCz-1 as determined by calorimetric methods. Part I: Heat capacities, heat contents and entropies

Abstract

The heat capacities of the anhydrous international reference clay minerals, smectite MX-80, illite IMt-2 and mixed-layer illite–smectite ISCz-1, were measured by low temperature adiabatic calorimetry and differential scanning calorimetry, from 6 to 520 K (at 1 bar). The samples were chemically purified and Na-saturated. Dehydrated clay fractions <2 μm were studied. The structural formulae of the corresponding clay minerals, obtained after subtracting the remaining impurities, are ( ) for smectite MX-80, ( for illite IMt-2 and ( )for mixed-layer ISCz-1. From the heat capacity values, we determined the molar entropies, standard entropies of formation and heat contents of these minerals.

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Earth Sciences
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Dates and versions

hal-03640644 , version 1 (13-04-2022)

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Hélène Gailhanou, J.C. van Miltenburg, J. Rogez, J. Olives, M. Amouric, et al.. Thermodynamic properties of anhydrous smectite MX-80, illite IMt-2 and mixed-layer illite–smectite ISCz-1 as determined by calorimetric methods. Part I: Heat capacities, heat contents and entropies. Geochimica et Cosmochimica Acta, 2007, 71 (22), pp.5463-5473. ⟨10.1016/j.gca.2007.09.020⟩. ⟨hal-03640644⟩
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