High Pressure Melting Curve of Fe Determined by Inter‐Metallic Fast Diffusion Technique
High Pressure Melting Curve of Fe Determined by Inter‐Metallic Fast Diffusion Technique
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DOI：
10.1029/2022gl102006
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发表时间：
2023-03
影响因子：
5.2
通讯作者：
I. Ezenwa;Y. Fei
中科院分区：
文献类型：
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作者：
I. Ezenwa;Y. Fei
上覆地幔从地核中提取的热量控制着地核的热演化。这反过来又导致了与轻合金元素析出到液态外核有关的内芯的凝固。虽然内核边界（ICB）的温度(T)将被调整以解释轻元素的影响，但铁的熔化T在ICB上放置了一个上限，这是核心热剖面中的一个关键点。在这里，我们通过表征铁-钨相互作用界面来确定铁在多砧压力机中的熔化温度。我们的数据对Fe在8 ~ 21 GPa之间的熔化曲线给出了更严格的约束，直接适用于小型行星体，可以作为Fe在更高压力下熔化曲线的锚点。
The heat extracted from the core by the overlying mantle across the core‐mantle boundary controls the thermal evolution of the core. This in turn leads to the solidification of the inner core in association with the exsolution of light alloying elements into the liquid outer core. Although the temperature (T) at the inner core boundary (ICB) would be adjusted to account for the effects of the light elements, the melting T of Fe places an upper bound at the ICB and it is a vital point in the thermal profile of the core. Here, we determine the melting T of Fe in the multi‐anvil press by characterizing the interface of Fe‐W interaction. Our data place a tighter constraint on the melting curve of Fe between 8 and 21 GPa, that is directly applicable to small planetary bodies and serves as an anchor for melting curve of Fe at higher pressure.