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Enthalpies of Formation of Alunite and Natroalunite (According to Calorimetric Data)

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Abstract—

A sample of natural alunite of the composition K0.6Na0.4Al3(SO4)2(OH)6 was studied by powder X-ray diffraction, infrared spectroscopy, electron microprobe, and thermal analysis. The enthalpy of formation of the alunite from elements ∆fH0(298.15 K) = −5149 ± 13 kJ/mol was determined by the method of melt solution calorimetry, using a Setaram (France) Calvet microcalorimeter. The calculated enthalpies and Gibbs energies of formation of the end members of the series alunite KAl3(SO4)2(OH)6 to natroalunite NaAl3(SO4)2(OH)6 are −5164 ± 13 and −4651 ± 13 kJ/mol, respectively, for alunite and − 5127 ± 13 and −4615 ± 13 kJ/mol, respectively, for natroalunite.

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ACKNOWLEDGMENTS

The STOE-STADI MP powder X-ray diffractometer, FSM-1201 Fourier-transform spectrometer, Q-1500D derivatograph, and Setaram (France) Tian–Calvet microcalorometer used in this study are installed at the Faculty of Geology, Lomonosov Moscow State University.

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Authors and Affiliations

  1. Faculty of Geology, Lomonosov Moscow State University, 119991, Moscow, Russia

    L. P. Ogorodova, Yu. D. Gritsenko, M. F. Vigasina, L. V. Melchakova & D. A. Ksenofontov

  2. Fersman Mineralogical Museum, Russian Academy of Sciences, 119962, Moscow, Russia

    Yu. D. Gritsenko

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  1. L. P. Ogorodova
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  2. Yu. D. Gritsenko
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  3. M. F. Vigasina
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  4. L. V. Melchakova
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  5. D. A. Ksenofontov
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Correspondence to L. P. Ogorodova.

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Translated by E. Kurdyukov

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Ogorodova, L.P., Gritsenko, Y.D., Vigasina, M.F. et al. Enthalpies of Formation of Alunite and Natroalunite (According to Calorimetric Data). Geochem. Int. 60, 596–602 (2022). https://doi.org/10.1134/S0016702922060052

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