Greigite (Fe₃S₄) is thermodynamically stable: Implications for its terrestrial and planetary occurrence
Iron sulfide minerals are widespread on Earth and likely in planetary bodies in and beyond our solar system. Using measured enthalpies of formation for three magnetic iron sulfide phases: bulk and nanophase Fe₃S₄ spinel (greigite), and its high-pressuremonoclinic phase, we show that greigite is a st...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2020-11, Vol.117 (46), p.28645-28648 |
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| container_title | Proceedings of the National Academy of Sciences - PNAS |
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| creator | Subramani, Tamilarasan Lilova, Kristina Abramchuk, Mykola Leinenweber, Kurt D. Navrotsky, Alexandra |
| description | Iron sulfide minerals are widespread on Earth and likely in planetary bodies in and beyond our solar system. Using measured enthalpies of formation for three magnetic iron sulfide phases: bulk and nanophase Fe₃S₄ spinel (greigite), and its high-pressuremonoclinic phase, we show that greigite is a stable phase in the Fe–S phase diagram at ambient temperature. The thermodynamic stability and low surface energy of greigite supports the common occurrence of fine-grained Fe₃S₄ in many anoxic terrestrial settings. The high-pressure monoclinic phase, thermodynamically metastable below about 3 GPa, shows a calculated negative P-T slope for its formation from the spinel. The stability of these three phases suggests their potential existence on Mercury and their magnetism may contribute to its present magnetic field. |
| doi_str_mv | 10.1073/pnas.2017312117 |
| format | Article |
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Using measured enthalpies of formation for three magnetic iron sulfide phases: bulk and nanophase Fe₃S₄ spinel (greigite), and its high-pressuremonoclinic phase, we show that greigite is a stable phase in the Fe–S phase diagram at ambient temperature. The thermodynamic stability and low surface energy of greigite supports the common occurrence of fine-grained Fe₃S₄ in many anoxic terrestrial settings. The high-pressure monoclinic phase, thermodynamically metastable below about 3 GPa, shows a calculated negative P-T slope for its formation from the spinel. 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Using measured enthalpies of formation for three magnetic iron sulfide phases: bulk and nanophase Fe₃S₄ spinel (greigite), and its high-pressuremonoclinic phase, we show that greigite is a stable phase in the Fe–S phase diagram at ambient temperature. The thermodynamic stability and low surface energy of greigite supports the common occurrence of fine-grained Fe₃S₄ in many anoxic terrestrial settings. The high-pressure monoclinic phase, thermodynamically metastable below about 3 GPa, shows a calculated negative P-T slope for its formation from the spinel. 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Using measured enthalpies of formation for three magnetic iron sulfide phases: bulk and nanophase Fe₃S₄ spinel (greigite), and its high-pressuremonoclinic phase, we show that greigite is a stable phase in the Fe–S phase diagram at ambient temperature. The thermodynamic stability and low surface energy of greigite supports the common occurrence of fine-grained Fe₃S₄ in many anoxic terrestrial settings. The high-pressure monoclinic phase, thermodynamically metastable below about 3 GPa, shows a calculated negative P-T slope for its formation from the spinel. 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| subjects | Ambient temperature Enthalpy Iron Iron sulfides Magnetic fields Magnetism Mercury Minerals Phase diagrams Physical Sciences Planetary magnetic fields S phase Solar system Spinel Surface energy Surface properties Surface stability Terrestrial environments |
| title | Greigite (Fe₃S₄) is thermodynamically stable: Implications for its terrestrial and planetary occurrence |
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