Abstract
We performed comparative study of phase relations in Fe1−x Ni x (0.10 ≤ x ≤ 0.22 atomic fraction) and Fe0.90Ni0.10−x C x (0.1 ≤ x ≤ 0.5 atomic fraction) systems at pressures to 45 GPa and temperatures to 2,600 K using laser-heated diamond anvil cell and large-volume press (LVP) techniques. We show that laser heating of Fe,Ni alloys in DAC even to relatively low temperatures can lead to the contamination of the sample with the carbon coming from diamond anvils, which results in the decomposition of the alloy into iron- and nickel-rich phases. Based on the results of LVP experiments with Fe–Ni–C system (at pressures up to 20 GPa and temperatures to 2,300 K) we demonstrate decrease of carbon solubility in Fe,Ni alloy with pressure.
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Acknowledgments
The project was partly supported by funds from the German Science Foundation (DFG) Priority Programme SPP1236 under project Mc 3/16-1 and the Eurocores EuroMinSci Programme. We thank Daniel J. Frost (Bayerisches Geoinstitut) for help with multianvil experiments as well as Hubert Schulze and Uwe Dittmann (Bayerisches Geoinstitut) for preparation of the quenched samples for further analyses.
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Narygina, O., Dubrovinsky, L.S., Miyajima, N. et al. Phase relations in Fe–Ni–C system at high pressures and temperatures. Phys Chem Minerals 38, 203–214 (2011). https://doi.org/10.1007/s00269-010-0396-x
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DOI: https://doi.org/10.1007/s00269-010-0396-x