Thermochemical study of Mg–Fe chlorites
The thermochemical study of two natural trioctahedral Mg–Fe chlorites—clinochlores was carried out using high-temperature melt solution calorimetry with a Tian–Calvet microcalorimeter. The enthalpies of formation of clinochlores of compositions (Mg 4.9 Fe 0.3 2+ Al 0.8 )[Si 3.2 Al 0.8 O 10 ](OH) 8 (...
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| Veröffentlicht in: | Geochemistry international 2017-03, Vol.55 (3), p.257-262 |
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| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | The thermochemical study of two natural trioctahedral Mg–Fe chlorites—clinochlores was carried out using high-temperature melt solution calorimetry with a Tian–Calvet microcalorimeter. The enthalpies of formation of clinochlores of compositions (Mg
4.9
Fe
0.3
2+
Al
0.8
)[Si
3.2
Al
0.8
O
10
](OH)
8
(–8811 ± 12 kJ/mol) and (Mg
4.3
Fe
0.7
2+
Al
1.0
)[Si
3.0
Al
1.0
O
10
](OH)
8
(–8696 ± 13 kJ/mol) from elements were determined. The values of the standard entropies and the Gibbs energies of formation of the studied natural minerals as well as thermodynamic properties of Mg–Fe chlorites of theoretical composition were estimated. |
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| ISSN: | 0016-7029 1556-1968 |
| DOI: | 10.1134/S0016702917030041 |