Thermodynamic Properties of Natural Cuspidine

L. P. Ogorodova; M. F. Vigasina; O. V. Kononov; N. N. Koshlyakova; D. A. Ksenofontov; D. A. Khanin; V. D. Shcherbakov; L. V. Mel’chakova

doi:10.1134/S0016702918080098

Thermodynamic Properties of Natural Cuspidine

Authors: Ogorodova L.P.¹, Vigasina M.F.¹, Kononov O.V.¹, Koshlyakova N.N.¹, Ksenofontov D.A.¹, Khanin D.A.¹, Shcherbakov V.D.¹, Mel’chakova L.V.¹
Affiliations:
1. Geological Faculty
Issue: Vol 56, No 8 (2018)
Pages: 865-869
Section: Short Communications
URL: https://ogarev-online.ru/0016-7029/article/view/156035
DOI: https://doi.org/10.1134/S0016702918080098
ID: 156035

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Abstract

The paper reports pioneering data on the calorimetrically determined enthalpy of formation from elements of cuspidine, Ca fluordiorthosilicate Ca₄Si₂O₇F₂, from the Tyrny-Auz Mo–W deposit in Kabardino- Balkaria, Russia. The data were obtained by high-temperature melt solution calorimetry. The determined value is ΔfH_el° (298.15 K) =–5190 ± 13 kJ/mol. The paper reports estimated S°(298.15 K) and Δ_fG_el° (298.15 K) of cuspidine.