THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURES
Equations of state of corundum (α-Al2O3), eskolaite (Cr2O3), hematite (α-Fe2O3), and magnetite (Fe3O4) are constructed based on the Helmholtz free energy by simultaneous optimization of ultrasonic, X-ray diffraction, dilatometric, and thermochemical measurements. The magnetic contribution to Cr2O3,...
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2016-09-01
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| Series: | Геодинамика и тектонофизика |
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| Online Access: | https://www.gt-crust.ru/jour/article/view/284 |
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| author | P. I. Dorogokupets T. S. Sokolova A. M. Dymshits K. D. Litasov |
| author_facet | P. I. Dorogokupets T. S. Sokolova A. M. Dymshits K. D. Litasov |
| author_sort | P. I. Dorogokupets |
| collection | DOAJ |
| description | Equations of state of corundum (α-Al2O3), eskolaite (Cr2O3), hematite (α-Fe2O3), and magnetite (Fe3O4) are constructed based on the Helmholtz free energy by simultaneous optimization of ultrasonic, X-ray diffraction, dilatometric, and thermochemical measurements. The magnetic contribution to Cr2O3, α-Fe2O3, and Fe3O4 Helmholtz free energy was determined via the A.T. Dinsdale model [Dinsdale, 1991]. The calculated thermodynamic properties of rock-forming oxides of aluminum, chromium, and iron are in good agreement with the reference data and experimental measurements at room pressure, as well as with P-V-T measurements at high temperatures and pressures. Thermodynamic functions (x, α, S, CP, CV, KT, KS, γth, G) of corundum, eskolaite, hematite, and magnetite are calculated at different pressures (up to 80, 70, 50 and 20 GPa, respectively) and temperatures (up to 2000 K), and the results are tabulated. The calculated Gibbs energy of rock-forming oxides can be used to construct the phase diagrams of mineral systems, which include the oxides under the conditions of the Earth’s mantle. |
| first_indexed | 2024-04-09T20:28:42Z |
| format | Article |
| id | doaj.art-643e8e846fc246b5a3315657e17910cc |
| institution | Directory Open Access Journal |
| issn | 2078-502X |
| language | English |
| last_indexed | 2024-04-09T20:28:42Z |
| publishDate | 2016-09-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj.art-643e8e846fc246b5a3315657e17910cc2023-03-30T20:08:02ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2016-09-017345947610.5800/GT-2016-7-3-0217212THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURESP. I. Dorogokupets0T. S. Sokolova1A. M. Dymshits2K. D. Litasov3Institute of the Earth’s Crust, Siberian Branch of RASInstitute of the Earth’s Crust, Siberian Branch of RASV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RASV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RASEquations of state of corundum (α-Al2O3), eskolaite (Cr2O3), hematite (α-Fe2O3), and magnetite (Fe3O4) are constructed based on the Helmholtz free energy by simultaneous optimization of ultrasonic, X-ray diffraction, dilatometric, and thermochemical measurements. The magnetic contribution to Cr2O3, α-Fe2O3, and Fe3O4 Helmholtz free energy was determined via the A.T. Dinsdale model [Dinsdale, 1991]. The calculated thermodynamic properties of rock-forming oxides of aluminum, chromium, and iron are in good agreement with the reference data and experimental measurements at room pressure, as well as with P-V-T measurements at high temperatures and pressures. Thermodynamic functions (x, α, S, CP, CV, KT, KS, γth, G) of corundum, eskolaite, hematite, and magnetite are calculated at different pressures (up to 80, 70, 50 and 20 GPa, respectively) and temperatures (up to 2000 K), and the results are tabulated. The calculated Gibbs energy of rock-forming oxides can be used to construct the phase diagrams of mineral systems, which include the oxides under the conditions of the Earth’s mantle.https://www.gt-crust.ru/jour/article/view/284thermodynamicsequation of statehelmholtz free energyoxidecorundumeskolaitehematitemagnetitemantle |
| spellingShingle | P. I. Dorogokupets T. S. Sokolova A. M. Dymshits K. D. Litasov THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURES Геодинамика и тектонофизика thermodynamics equation of state helmholtz free energy oxide corundum eskolaite hematite magnetite mantle |
| title | THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURES |
| title_full | THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURES |
| title_fullStr | THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURES |
| title_full_unstemmed | THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURES |
| title_short | THERMODYNAMIC PROPERTIES OF ROCK-FORMING OXIDES, α-Al2O3, Cr2O3, α-Fe2O3, AND Fe3O4 AT HIGH TEMPERATURES AND PRESSURES |
| title_sort | thermodynamic properties of rock forming oxides α al2o3 cr2o3 α fe2o3 and fe3o4 at high temperatures and pressures |
| topic | thermodynamics equation of state helmholtz free energy oxide corundum eskolaite hematite magnetite mantle |
| url | https://www.gt-crust.ru/jour/article/view/284 |
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