Structure type and bulk modulus of Fe<sub>3</sub>S, a new iron-sulfur compound

Fei, Yingwei; Li, Jie; Bertka, C. M.; Prewitt, C. T.

doi:10.2138/am-2000-11-1229

Cited by 181 publications

(223 citation statements)

References 15 publications

Supporting

Mentioning

193

Contrasting

Unclassified

Order By: Relevance

“…%) Si in the inner core. SI Table 3), similar to the results of Fei et al (22). Williams and Knittle (36) proposed that K T Ј can place an effective constraint on the primary alloying element in the outer core.…”

Section: Resultssupporting

confidence: 85%

See 1 more Smart Citation

Thermal expansion of iron-rich alloys and implications for the Earth's core

Chen

Gao

Funakoshi

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

View full text Add to dashboard Cite

Understanding the thermal-chemical state of the Earth's core requires knowledge of the thermal expansion of iron-rich alloys at megabar pressures and high temperatures. Our survey of literature revealed a significant lack of such data. We have determined the unit-cell parameters of the iron-sulfur compound Fe3S by using synchrotron x-ray diffraction techniques and externally heated diamond-anvil cells at pressures up to 42.5 GPa and temperatures up to 900 K. The zero-pressure thermal expansivity of Fe3S is determined in the form ␣ ‫؍‬ a1 ؉ a2T, where a1 ‫؍‬ 3.0 ؎ 1.3 ؋ 10 ؊5 K ؊1 and a2 ‫؍‬ 2.8 ؎ 1.5 ؋ 10 ؊8 K ؊2 . The temperature dependence of isothermal bulk modulus (٢KT,0/٢T)P is estimated at ؊3.75 ؎ 1.80 ؋ 10 ؊2 GPa K ؊1 . Our data at 42.5 GPa and 900 K suggest that Ϸ2.1 at. % (1.2 wt. %) sulfur produces 1% density deficit in iron. We have also carried out energy-dispersive x-ray diffraction measurements on pure iron and Fe0.864Si0.136 alloy samples that were placed symmetrically in the same multianvil cell assemblies, using the SPring-8 synchrotron facility in Japan. Based on direct comparison of unit cell volumes under presumably identical pressures and temperatures, our data suggest that at most 3.2 at. % (1.6 wt. %) silicon is needed to produce 1% density deficit with respect to pure iron.Fe3S ͉ Fe-Si alloy ͉ light element

show abstract

Section: Resultssupporting

confidence: 85%

“…If the small K T Ј of Fe 3 S persists to higher pressures and temperatures, the model of a S-rich core would be challenged. The K T Ј from our study and Fei et al (22) are much smaller than that given in Seagle et al (17). Independent studies are needed to resolve the discrepancy.…”

Section: Resultscontrasting

confidence: 77%

Thermal expansion of iron-rich alloys and implications for the Earth's core

Chen

Gao

Funakoshi

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The diffraction peaks of the fcc and hcp phases were derived from the Fe-Si alloy. Fe 3 S, which has been reported as an intermediate phase in the Fe-FeS system (e.g., Fei et al 2000), appeared as a result of a reaction between Fe and FeS. Other possible phases in the Fe-FeS system, such as Fe 2 S and Fe 3 S 2 , were not observed in this study.…”

Section: Subsolidus Phases In the Fe-s-si Systemcontrasting

confidence: 53%

“…In the Fe-FeS system, Fe 3 S 2 , Fe 2 S, and Fe 3 S have been reported as intermediate phases (e.g., Fei et al 1997Fei et al , 2000Li et al 2001), and hcp-Fe and Fe 3 S are stable as the subsolidus phases up to the core conditions. The eutectic temperature in the Fe-Fe 3 S system was measured up to 180 GPa using a diamond anvil cell (DAC) (e.g., Kamada et al 2010Kamada et al , 2012Morard et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Melting relations in the Fe–S–Si system at high pressure and temperature: implications for the planetary core

Sakairi

Ohtani

Kamada

et al. 2017

Prog. in Earth and Planet. Sci.

View full text Add to dashboard Cite

The phase and melting relations in the Fe-S-Si system were determined up to 60 GPa by using a double-sided laser-heated diamond anvil cell combined with X-ray diffraction. On the basis of the X-ray diffraction patterns, we confirmed that hcp/fcc Fe-Si alloys and Fe 3 S are stable phases under subsolidus conditions in the Fe-S-Si system. Both solidus and liquidus temperatures are significantly lower than the melting temperature of pure Fe and both increase with pressure. The slopes of the Fe-S-Si liquidus and solidus curves determined here are smaller than the adiabatic temperature gradients of the liquid cores of Mercury and Mars. Thus, crystallization of their cores started at the core-mantle boundary region.

show abstract

“…Recent experimental work (Fei et al , 2000Chudinovskikh and Boehler 2007) have identified two important aspects of the Fe-FeS phase diagram that apply to the smaller Earth-like planets and satellites (e.g., Mars, Moon, Mercury, the Galilean satellites, and Titan): (1) at pressures lower than 14 GPa the eutectic melting temperature decreases with increasing pressure, and (2) at pressures lower than 40 GPa the eutectic sulfur concentration decreases with increasing pressure.…”

Section: Snow and Exsolutionmentioning

confidence: 99%

Thermal Evolution and Magnetic Field Generation in Terrestrial Planets and Satellites

Breuer¹,

Labrosse²,

Spohn³

2010

Planetary Magnetism

View full text Add to dashboard Cite

Of the terrestrial planets, Earth and Mercury have self-sustained fields while Mars and Venus do not. Magnetic field data recorded at Ganymede have been interpreted as evidence of a self-generated magnetic field. The other icy Galilean satellites have magnetic fields induced in their subsurface oceans while Io and the Saturnian satellite Titan apparently are lacking magnetic fields of internal origin altogether.

show abstract

Structure type and bulk modulus of Fe₃S, a new iron-sulfur compound

Cited by 181 publications

References 15 publications

Thermal expansion of iron-rich alloys and implications for the Earth's core

Thermal expansion of iron-rich alloys and implications for the Earth's core

Melting relations in the Fe–S–Si system at high pressure and temperature: implications for the planetary core

Thermal Evolution and Magnetic Field Generation in Terrestrial Planets and Satellites

Contact Info

Product

Resources

About

Structure type and bulk modulus of Fe3S, a new iron-sulfur compound

Cited by 181 publications

References 15 publications

Thermal expansion of iron-rich alloys and implications for the Earth's core

Thermal expansion of iron-rich alloys and implications for the Earth's core

Melting relations in the Fe–S–Si system at high pressure and temperature: implications for the planetary core

Thermal Evolution and Magnetic Field Generation in Terrestrial Planets and Satellites

Contact Info

Product

Resources

About

Structure type and bulk modulus of Fe₃S, a new iron-sulfur compound