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

Hélène Gailhanou; J.C. van Miltenburg; J. Rogez; J. Olives; M. Amouric; E.C. Gaucher; Philippe Blanc

doi:10.1016/j.gca.2007.09.020

Article dans une revue

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

Hélène Gailhanou ^{1, 2, 3} J.C. van Miltenburg ⁴ J. Rogez ⁵ J. Olives ² M. Amouric ² E.C. Gaucher ¹ Philippe Blanc ¹

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

2 CRMCN - Centre de recherche de la matière condensée et des nanosciences

3 ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs

4 HU - University of Applied Sciences [Utrecht]

5 TECSEN - Laboratoire de thermodynamique, propriétés électriques, contraintes, structures aux échelles nanométriques

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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Article dans une revue

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Planète et Univers [physics] / Sciences de la Terre

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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

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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

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