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Abstract
We measured the sound velocity of Fe3S at room temperature up to 85 GPa employing inelastic X‑ray scattering to better constrain the constitution of the inner core. The density of Fe3S was also determined by X-ray diffraction under the same conditions. The relation of the P-wave velocity (vP) and density (ρ) of Fe3S follows Birch’s law, vP(m/s) = 1.14(5) × ρ(kg/m3) - 2580(410). Based on Birch’s law determined here for Fe3S and that for ε-Fe reported previously, we found that sulfur decreases both density and compressional velocity of hcp-Fe at the core pressure and 300 K.
Published Online: 2014-1-15
Published in Print: 2014-1-1
© 2014 by Walter de Gruyter GmbH & Co.