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We found a new nickel sulfide that is isostructural with Fe 3 S. The synthesized nickel sulfide is a non-stoichiometric compound with a Ni deficiency and its composition is Ni 2.90±0.5 S. In situ synchrotron X-ray observations indicate that Ni 3-x S forms above 5.1 GPa and melts incongruently into Ni+liquid up to 10 GPa. The bulk modulus of Ni 3-x S 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 Ni 3 S and Ni 3 S 2  up to 10 GPa and its composition changes from Ni 66.6 S 33.4  at 0.1 MPa to Ni 70.7 S 29.3  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-Ni 3 S 2  are the eutectic solids. On the other hand, the eutectic melting temperature increases with a positive slope above 5.1 GPa where Ni 3 S+α-Ni 3 S 2  is stable under subsolidus conditions. Intermediate compounds appear at a lower pressure in the Ni-NiS system than that for the Fe-FeS system. Ni 3 S 2  is stable at atmospheric pressure and Ni 3 S forms at 5.1 GPa, whereas Fe 3 S 2  and Fe 3 S 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 Ni 3 S. The low-melting temperature of the Fe-Ni-S system plays an important role in the percolative core-formation of planetesimals during planetary accretion.

Stability and bulk modulus of Ni 3 S, a new nickel sulfur compound, and the melting relations of the system Ni-NiS up to 10 GPa