Abstract
Fe-S-P compounds have been observed in many meteorites and could be the important components in planetary cores. Here we investigated the phase stability of Fe3(S,P) solid solutions and synthesized high-quality Fe3(S1–xPx) high-pressure phases in the multi-anvil press. The physical properties of Fe3(S0.5P0.5) were further studied in the diamond-anvil cell by synchrotron X-ray diffraction and emission spectroscopy. The solubility of S in the Fe3(S,P) solid solution increases with increasing pressure. The minimum pressure to synthesize the pure Fe3S and Fe3(S0.13P0.87) is about 21 and 8 GPa, respectively. The observed discontinuity in unit-cell parameters at about 18 GPa is caused by the high-spin to low- spin transition of iron, supported by X-ray emission spectroscopy data. The sulfur solubility in Fe3(S,P) solid solutions could be an excellent pressure indicator if such solid solutions are found in nature.
Acknowledgments
We thank Vincenzo Stagno, Li Zhang, and Renbiao Tao for technique assistance of multi-anvil experiments; John Armstrong, Katherine Crispin, and Paul Goldey for technique assistance of microprobe analysis; Jinfu Shu for technique assistance of DAC experiments; Ho-kwang Mao for sharing beam time at HPCAT 16 IDD; and Yuming Xiao and Daijo Ikuta for beamline assistance at HPCAT. The pre-doctoral fellowship (T. Gu) was supported by the financial support of CSC scholarship. The experiments were supported by NSF grant Geochemistry grant (to Y.F.). X. Wu and S. Qin are grateful for the financial support of the National Natural Science Foundation of China (Grant No. U1232204). T. Gu thanks the financial support of the National Natural Science Foundation of China (Grant No. 41502035) and the support of NSAF (Grant No. U1530402).
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Manuscript handled by Katherine Crispin.
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