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Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements

Hélène GailHanou, PHiliPPe Blanc

2013ensaponitenontronitevermiculitecalorimetrythermodynamics

Abstract

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The stability of clay minerals is an important factor in assessing the durability of containment barriers for deep waste storage. In that context, the complete thermodynamic data set of three 2:1 ferro-magnesian clay minerals have been determined at 1 bar and from 2 to 520 K, using calorimetric methods. The studied clay samples were, respectively, the Na-saturated saponite Sap-Ca-1, Na 0.394 K0.021Ca0.038(Si3.569Al0.397Fe3+ 0.034)(Mg2.948Fe2+ 0.021Mn0.001)O10(OH)2, the Ca-saturated nontronite NAu-1, Ca0.247K0.020(Si3.458Al0.542)(Mg0.066Fe3+ 1.688Al0.268Ti0.007)O10(OH)2, and the Ca-saturated Santa Olalla vermiculite, Ca0.445(Si2.778Al1.222)(Al0.192Mg2.468Fe3+ 0.226Fe2+ 0.028Ti0.018Mn0.007)O10(OH)2. The standard enthalpies of formation were obtained by solution-reaction calorimetry at 298.15 K. The heat capacities were measured between 2 and 520 K, using low-temperature adiabatic calorimetry, heat-pulse calorimetry, and differential scanning calorimetry. The standard entropies and the Gibbs free energies of formation at 298.15 K have been calculated from these values. Finally, the equilibrium constants at 298.15 K have been determined.

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Cite This Work

@article{aa39c085-fac5-4920-b478-af6517a60778,
  title={Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements},
  author={Hélène GailHanou and PHiliPPe Blanc},
  year={2013},
  language={en}
}
TY  - JOUR
TI  - Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements
AU  - Hélène GailHanou
AU  - PHiliPPe Blanc
PY  - 2013
LA  - en
ER  -

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