Calorimetric Study of Natural Anapaite
- Authors: Ogorodova L.P.1, Melchakova L.V.1, Vigasina M.F.1, Ksenofontov D.A.1, Bryzgalov I.A.1
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Affiliations:
- Geological Faculty
- Issue: Vol 56, No 4 (2018)
- Pages: 397-401
- Section: Short Communications
- URL: https://journals.rcsi.science/0016-7029/article/view/155927
- DOI: https://doi.org/10.1134/S0016702918040080
- ID: 155927
Cite item
Abstract
The thermochemical study of natural hydrous calcium and iron phosphate, anapaite Ca2Fe(PO4)2 · 4H2O (Kerch iron ore deposit, Crimea, Russia), was carried out using high-temperature melt solution calorimetry with a Tian-Kalvet microcalorimeter. The enthalpy of formation of the mineral from elements was obtained to be Δ fHel°(298.15 K) =–4812 ± 16 kJ/mol. The values of the standard entropy and the Gibbs energy of anapaite formation are S°(298.15 K) = 404.2 J/K mol and Δ fGel°(298.15 K) =–4352 ± 16 kJ/mol, respectively.
About the authors
L. P. Ogorodova
Geological Faculty
Author for correspondence.
Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991
L. V. Melchakova
Geological Faculty
Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991
M. F. Vigasina
Geological Faculty
Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991
D. A. Ksenofontov
Geological Faculty
Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991
I. A. Bryzgalov
Geological Faculty
Email: logor@geol.msu.ru
Russian Federation, Moscow, 119991
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