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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >'Carbon in the core' revisited
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'Carbon in the core' revisited

机译：重温“核心碳”

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In order to investigate the existence of carbon in the core, we performed high-pressure melting experiments using a Kawai-type multi-anvil apparatus by two methods: (1) quench experiments up to 14GPa and 2200 degrees C and (2) in situ X-ray diffraction experiments up to 29GPa. From the quench experiments, carbon solubility in molten iron and liquidus phase relations in the Fe-C system was investigated. The carbon solubility in molten iron is 8.5 wt% at 5 GPa and 2000 degrees C, where graphite is the liquidus phase. At 10-14GPa, the carbon solubility in molten iron coexisting with diamond is about 7 wt% at 2000 degrees C and is pressure insensitive. At 5 GPa, Fe3C (6.7 wt% C) is the liquidus phase below 1400 degrees C. Above 10 GPa, Fe7C3 (8.4 wt% C) appears as the liquidus phase below 1700 degrees C and Fe3C melts incongruently to liquid iron and Fe7C3 at temperatures below 1500 degrees C. From in situ X-ray diffraction observations, the incongruent melting of Fe3C was found to occur at least up to 29 GPa, and liquidus temperatures of the Fe3C composition were found to be 1825 and 1925 degrees C at 21.0 and 29.2 GPa, respectively. Based on our results, it is concluded that large amount of carbon could be incorporated into the Earth's core if the Earth forming material was rich in carbon. Our result also shows that Fe7C3 Would be the first crystallizing phase from the liquid of the outer core, implying that Fe7C3 could be a potential constituent of the solid inner core.
机译：为了研究芯中碳的存在，我们使用两种方法使用Kawai型多砧装置进行高压熔融实验：（1）淬火实验，最高14GPa和2200摄氏度，（2）原位X射线衍射实验高达29GPa。通过淬火实验，研究了铁碳体系中碳在铁水中的溶解度和液相线关系。在5 GPa和2000摄氏度下，碳在铁水中的溶解度为8.5 wt％，其中石墨为液相。在10-14GPa下，与金刚石共存的铁水中的碳溶解度在2000摄氏度下约为7 wt％，并且对压力不敏感。在5 GPa时，Fe3C（6.7 wt％C）是低于1400摄氏度的液相线。当高于10 GPa时，Fe7C3（8.4 wt％C）在液相线低于1700摄氏度时出现，Fe3C与液态铁和Fe7C3熔融不相容温度低于1500摄氏度。根据原位X射线衍射观察，发现Fe3C熔融不均匀至少达到29 GPa，Fe3C组合物的液相线温度分别为1825和1925℃（21.0）和分别为29.2 GPa。根据我们的结果，可以得出结论，如果形成地球的物质富含碳，那么大量的碳可以被掺入地球的核心。我们的结果还表明，Fe7C3将是外核液体中的第一个结晶相，这意味着Fe7C3可能是固态内核的潜在成分。

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