Abstract
The results of thermochemical studies are reported for nontronite samples from the Pinares-de-Majari (Eastern Cuba) (Sample I) and Kempirsai serpentine massif (South Urals, Kazakhstan) (Sample II). The enthalpies of formation of dehydrated hydroxyl-bearing nontronites from elements were determined by melt dissolution calorimetry using high-temperature heat-flux Tiana-Calvet microcalorimeter: Δ f H oel (298.15 K): −4958 ± 13 kJ/mol for Mg0.4(Fe 3+1.5 Mg0.4Ni0.1)[Si3.7Al0.3O10](OH)2 (I) and −5003.6 ± 8.0 kJ/mol for Mg0.3Na0.1Ca0.1(Fe 3+1.4 Mg0.5Ni0.1)[Si3.7Al0.3O10](OH)2 (II). It was determined experimentally that the enthalpy of dehydration (removal of molecular adsorption and interlayer water) of the studied nontronites is 6 ± 2 kJ per 1 mole H2O. The enthalpy of formation of nontronite of theoretical composition Mg0.15Fe 3+2 [Si3.7Al0.3]O10(OH)2 was estimated at −4750 kJ/mol. The Gibbs free energies of formation of the nontronites were calculated.
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Original Russian Text © L.P. Ogorodova, I.A. Kiseleva, L.V. Melchakova, M.F. Vigasina, V.V. Krupskaya, Yu.Yu. Bugel’skii, 2014, published in Geokhimiya, 2014, No. 5, pp. 468–475.
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Ogorodova, L.P., Kiseleva, I.A., Melchakova, L.V. et al. Thermodynamic properties of Fe-rich smectite-nontronite. Geochem. Int. 52, 421–427 (2014). https://doi.org/10.1134/S0016702914030057
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DOI: https://doi.org/10.1134/S0016702914030057