Abstract
Destinezite (\({\text{Fe}}_{{1.97}}^{{3 + }}\)Al0.02)(PO4)0.99(SO4)0.90(OH)1.20⋅5.97H2O (Czech Republic) has been studied by thermal and electron-microprobe analyses, X-ray powder diffraction, and by IR, Raman, and Mössbauer spectroscopy. The enthalpy of formation of destinezite \({\text{Fe}}_{2}^{{3 + }}\)(PO4)(SO4)(OH)⋅6H2O from elements ∆fH0(298.15 K) = –4258 ± 12 kJ/mol was determined by the method of solution calorimetry in lead borate 2PbO⋅B2O3 melt on a Setaram (France) Calvet microcalorimeter. The value of its absolute entropy S0(298.15 K) = 462.0 J/(mol K) was estimated, the entropy of formation ∆fS0(298.15 K) = –2054 J/(mol K), and the Gibbs energy of formation from the elements ∆fG0(298.15 K) = –3646 kJ/mol were calculated.
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ACKNOWLEDGMENTS
The authors thank the scientific editor of the journal the corresponding member of the Russian Academy of Sciences O.L. Kuskov and the reviewers for assistance with the preparation of the manuscript.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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Gritsenko, Y.D., Ogorodova, L.P., Vigasina, M.F. et al. Destinezite: A Physicochemical and Calorimetric Study. Geochem. Int. 62, 274–283 (2024). https://doi.org/10.1134/S0016702924030042
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DOI: https://doi.org/10.1134/S0016702924030042