在地核热力学条件下氙和铁/镍金属间化合物的合成
Synthesis of Xenon and Iron/Nickel intermetallic compounds at Earth's core thermodynamic conditions
摘要：
虽然已知铁与强负电性元素形成稳定的化合物，但直到最近才发现铁和镍等正电性元素形成稳定化合物的证据。除了稀有气体元素化学这一新兴领域的重要性之外，Xe-Fe/Ni化合物的可能形成也被认为是所谓的“缺失的元素悖论”的合理解释。在这里，我们探讨了在代表地球核心的热力学条件下，在Xe-Fe/Ni系统中可能形成的稳定化合物。使用同步辐射X射线衍射和拉曼光谱与第一性原理计算相结合，我们证明了稳定的双（Fe，Fe/Ni）$_3$和XeNi $_3$化合物的合成。结果表明，在极端条件下，稀有气体元素可以与在环境条件下为正电性的元素形成稳定的化合物，但在高压下会变成轻微的负电性。
英文摘要：
Although Xe is known to form stable compounds with strong electronegative elements, evidence on the formation of stable compounds with electropositive elements, such as Fe and Ni, was missing until very recently. In addition to the significance of the emerging field of noble gas elements chemistry, the possible formation of Xe-Fe/Ni compounds has been proposed as a plausible explanation of the so-called "missing Xe paradox". Here we explore the possible formation of stable compounds in the Xe-Fe/Ni systems at thermodynamic conditions representative of Earth's core. Using in situ synchrotron X-ray diffraction and Raman spectroscopy in concert with first principles calculations we demonstrate the synthesis of stable Xe(Fe,Fe/Ni)$_3$ and XeNi$_3$ compounds. The results indicate the changing chemical properties of elements under extreme conditions where noble gas elements can form stable compounds with elements which are electropositive at ambient conditions but become slightly electronegative at high pressures.
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