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Although Xe is known to form stable compounds with strong electronegativeelements, evidence on the formation of stable compounds with electropositiveelements, such as Fe and Ni, was missing until very recently. In addition tothe significance of the emerging field of noble gas elements chemistry, thepossible formation of Xe-Fe/Ni compounds has been proposed as a plausibleexplanation of the so-called "missing Xe paradox". Here we explore the possibleformation of stable compounds in the Xe-Fe/Ni systems at thermodynamicconditions representative of Earth's core. Using in situ synchrotron X-raydiffraction and Raman spectroscopy in concert with first principlescalculations we demonstrate the synthesis of stable Xe(Fe,Fe/Ni)$_3$ andXeNi$_3$ compounds. The results indicate the changing chemical properties ofelements under extreme conditions where noble gas elements can form stablecompounds with elements which are electropositive at ambient conditions butbecome slightly electronegative at high pressures.

Synthesis of Xenon and Iron/Nickel intermetallic compounds at Earth's core thermodynamic conditions