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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Phase relationships of the Fe-FeS system in conditions up to the Earth's outer core
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Phase relationships of the Fe-FeS system in conditions up to the Earth's outer core

机译：Fe-FeS系统在直到地球外核的条件下的相位关系

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In situ X-ray diffraction experiments in the Fe-FeS system were performed up to 220 GPa and 3300 K using a laser-heated diamond anvil cell. Fe3S and epsilon-Fe coexisted stably up to 220 GPa and 3300 K, and thus, Fe3S is likely to be the stable S-bearing iron alloy under the Earth's core conditions. The solid iron (E-Fe) also contained 7.6(0.8) at.% of sulfur at 86 GPa and 2200 K. The amount of sulfur in the solid iron increased with increasing pressure at the eutectic temperatures. If the sulfur content obtained in this study is extrapolated to the conditions at the inner core, all the sulfur in the solid inner core can be stored in epsilon-Fe. The eutectic composition becomes nonsensitive to pressure and seems to be constant around 20 at.% of sulfur at pressures above 40 GPa. The pressure gradient of the melting curve of the Fe-FeS system is 13.4 (0.7) K/GPa. Based on our results of melting relationship, the temperature at the core-mantle boundary should be greater than 2850(100) K, assuming that sulfur is the only light element in the Earth's liquid outer core.
机译：Fe-FeS系统中的原位X射线衍射实验是使用激光加热的金刚石砧盒在220 GPa和3300 K的压力下进行的。 Fe3S和ε-Fe稳定地共存至220 GPa和3300 K，因此，Fe3S可能是地球核心条件下稳定的含S铁合金。固态铁（E-Fe）在86 GPa和2200 K下还含有7.6（0.8）at。的硫。固态铁中的硫含量随着共晶温度的升高而增加。如果将本研究中获得的硫含量外推至内芯条件，则固态内芯中的所有硫都可以储存在ε-Fe中。共晶成分对压力变得不敏感，并且在高于40 GPa的压力下似乎在20 at。％的硫附近是恒定的。 Fe-FeS系统的熔融曲线的压力梯度为13.4（0.7）K / GPa。根据我们的熔融关系结果，假设硫是地球液态外核中唯一的轻元素，则核-幔边界处的温度应高于2850（100）K。

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