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Stability and bulk modulus of Ni3S, a new nickel sulfur compound, and the melting relations of the system Ni-NiS up to 10 GPa

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Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 96 Issue 4

Abstract

We found a new nickel sulfide that is isostructural with Fe3S. The synthesized nickel sulfide is a non-stoichiometric compound with a Ni deficiency and its composition is Ni2.90±0.5S. In situ synchrotron X-ray observations indicate that Ni3-xS forms above 5.1 GPa and melts incongruently into Ni+liquid up to 10 GPa. The bulk modulus of Ni3-xS at 300 K was determined to be 140 ± 2 GPa with a fixed K' = 4 by static compression with a liquid pressure medium. The eutectic point of the Ni-NiS system lies between Ni3S and Ni3S2 up to 10 GPa and its composition changes from Ni66.6S33.4 at 0.1 MPa to Ni70.7S29.3 at 10 GPa. The eutectic melting temperature of the Ni-NiS system decreases to 5.1 GPa and 720 K as the pressure increases where Ni and α-Ni3S2 are the eutectic solids. On the other hand, the eutectic melting temperature increases with a positive slope above 5.1 GPa where Ni3S+α-Ni3S2 is stable under subsolidus conditions. Intermediate compounds appear at a lower pressure in the Ni-NiS system than that for the Fe-FeS system. Ni3S2 is stable at atmospheric pressure and Ni3S forms at 5.1 GPa, whereas Fe3S2 and Fe3S form at 14 and 20 GPa, respectively. The addition of Ni complicates the melting relationship in the Fe-FeS system at high pressure because of the wider stability field of Ni3S. The low-melting temperature of the Fe-Ni-S system plays an important role in the percolative core-formation of planetesimals during planetary accretion.

Keywords : Nickel; sulfur; light element; melting; high pressure; core
Received: 2010-4-11
Accepted: 2010-11-5
Published Online: 2015-4-2
Published in Print: 2011-4-1

© 2015 by Walter de Gruyter Berlin/Boston

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  4. Characterization of deep weathering and nanoporosity development in shale—A neutron study
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  6. Critical evaluation of the revised akdalaite model for ferrihydrite
  7. Neutron diffraction study of hydrogen in birnessite structures
  8. Pressless split-sphere apparatus equipped with scaled-up Kawai-cell for mineralogical studies at 10–20 GPa
  9. Dislocation microstructures in majorite garnet experimentally deformed in the multi-anvil apparatus
  10. Density of carbonated peridotite magma at high pressure using an X-ray absorption method
  11. Stability and bulk modulus of Ni3S, a new nickel sulfur compound, and the melting relations of the system Ni-NiS up to 10 GPa
  12. Far-infrared spectra of synthetic [4][(Al2-xGax)(Si2–yGey)](OH,OD,F)2-kinoshitalite: Characterization and assignment of interlayer Ba-Oinner and Ba-Oouter stretching bands
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  14. Anatomy of a metabentonite: Nucleation and growth of illite crystals and their coalescence into mixed-layer illite/smectite
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  17. Raman spectroscopic investigations of some Tl-sulfosalt minerals containing pyramidal (As,Sb)S3 groups
  18. A first record of strong structural relaxation of TO4 tetrahedra in a spinel solid solution
  19. The high-pressure behavior of orthorhombic amphiboles
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  21. Chemical variation and significance of micas from the Fregeneda-Almendra pegmatitic field (Central-Iberian Zone, Spain and Portugal)
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https://doi.org/10.2138/am.2011.3578
Keywords for this article
Nickel; sulfur; light element; melting; high pressure; core

Articles in the same Issue

  1. Roebling Medal Lecture. The three partners of metamorphic petrology
  2. Relationship between structure, morphology, and carbon isotopic composition of graphite in marbles: Implications for calcite-graphite carbon isotope thermometry
  3. Crystal structure, mosaicity, and strain analysis of Hawaiian olivines using in situ X-ray diffraction
  4. Characterization of deep weathering and nanoporosity development in shale—A neutron study
  5. Structural water in ferrihydrite and constraints this provides on possible structure models
  6. Critical evaluation of the revised akdalaite model for ferrihydrite
  7. Neutron diffraction study of hydrogen in birnessite structures
  8. Pressless split-sphere apparatus equipped with scaled-up Kawai-cell for mineralogical studies at 10–20 GPa
  9. Dislocation microstructures in majorite garnet experimentally deformed in the multi-anvil apparatus
  10. Density of carbonated peridotite magma at high pressure using an X-ray absorption method
  11. Stability and bulk modulus of Ni3S, a new nickel sulfur compound, and the melting relations of the system Ni-NiS up to 10 GPa
  12. Far-infrared spectra of synthetic [4][(Al2-xGax)(Si2–yGey)](OH,OD,F)2-kinoshitalite: Characterization and assignment of interlayer Ba-Oinner and Ba-Oouter stretching bands
  13. High-temperature elasticity of polycrystalline orthoenstatite (MgSiO3)
  14. Anatomy of a metabentonite: Nucleation and growth of illite crystals and their coalescence into mixed-layer illite/smectite
  15. Zn-O tetrahedral bond length variations in normal spinel oxides
  16. A new thermodynamic analysis of the intergrowth of hedenbergite and magnetite with Ca-Fe-rich olivine
  17. Raman spectroscopic investigations of some Tl-sulfosalt minerals containing pyramidal (As,Sb)S3 groups
  18. A first record of strong structural relaxation of TO4 tetrahedra in a spinel solid solution
  19. The high-pressure behavior of orthorhombic amphiboles
  20. XAS determination of the Fe local environment and oxidation state in phonolite glasses
  21. Chemical variation and significance of micas from the Fregeneda-Almendra pegmatitic field (Central-Iberian Zone, Spain and Portugal)
  22. Light-induced molecular change in HgI2·As4S4: Evidence by single-crystal X-ray diffraction and Raman spectroscopy
  23. Low-temperature electron paramagnetic resonance studies on natural calumetite from Khetri copper mine, Rajasthan, India
  24. Chromatite and its Cr3+- and Cr6+-bearing precursor minerals from the Nabi Musa Mottled Zone complex, Judean Desert
  25. Hazenite, KNaMg2(PO4)2⋅14H2O, a new biologically related phosphate mineral, from Mono Lake, California, U.S.A.
  26. The fractional latent heat of crystallizing magmas
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