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We performed a series of experiments in the system Fe-FeS at a pressure of 21 GPa and temperatures between 950 and 1400 °C, and we found two new iron-excess iron-sulfur compounds, Fe 3 S and Fe 2 S, formed at subsolidus temperatures. Powder X-ray diffraction data revealed that Fe 3 S has a tetragonal cell, isostructural with Fe 3 P (space group I4 - ). The tetragonal unit-cell dimensions for Fe 3 S are a = 9.144(2) Å and c = 4.509(2) Å, with a zero-pressure density of 7.033 g/cm 3 . Static compression experiments on Fe 3 S were carried out in a diamond-anvil cell, using synchrotron X-ray diffraction technique. A least-squares fit to the experimental data at room temperature yielded bulk modulus K 0  = 170 ± 8 GPa with a corresponding pressure derivative K 0 ' = 2.6 ± 0.5 or K0 = 150 ± 2 GPa with fixed K 0 ' = 4

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