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- W2418458575 abstract "The noble gases are the most inert group of the periodic table, but their reactivity increases with pressure. Diamond-anvil-cell experiments and ab initio modelling have been used to investigate a possible direct reaction between xenon and oxygen at high pressures. We have now synthesized two oxides below 100 GPa (Xe2O5 under oxygen-rich conditions, and Xe3O2 under oxygen-poor conditions), which shows that xenon is more reactive under pressure than predicted previously. Xe2O5 was observed using X-ray diffraction methods, its structure identified through ab initio random structure searching and confirmed using X-ray absorption and Raman spectroscopies. The experiments confirm the recent prediction of Xe3O2 as a stable xenon oxide under high pressure. Xenon atoms adopt mixed oxidation states of 0 and +4 in Xe3O2 and +4 and +6 in Xe2O5. Xe3O2 and Xe2O5 form extended networks that incorporate oxygen-sharing XeO4 squares, and Xe2O5 additionally incorporates oxygen-sharing XeO5 pyramids. Other xenon oxides (XeO2, XeO3) are expected to form at higher pressures. The reactivity of the noble gases—a notoriously inert group—at high pressures is intriguing. Now, two xenon oxides with unusual stoichiometries, Xe2O5 and Xe3O2, have been synthesized above 78 GPa and predicted to be stable above 50 GPa, indicating that xenon is more reactive than previously thought." @default.
- W2418458575 created "2016-06-24" @default.
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- W2418458575 date "2016-05-30" @default.
- W2418458575 modified "2023-10-14" @default.
- W2418458575 title "Synthesis and stability of xenon oxides Xe2O5 and Xe3O2 under pressure" @default.
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- W2418458575 doi "https://doi.org/10.1038/nchem.2528" @default.
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