Structure and stability of solid Xe(H2)n

The Journal of Chemical Physics
Maddury SomayazuluR J Hemley

Abstract

Mixtures of xenon and molecular hydrogen form a series of hexagonal, van der Waals compounds at high pressures and at 300 K. Synchrotron, x-ray, single crystal diffraction studies reveal that below 7.5 GPa, Xe(H2)8 crystallizes in a P3̄m1 structure that displays pressure-induced occupancy changes of two pairs of xenon atoms located on the 2c and 2d sites (while the third pair on yet another 2c site remains fully occupied). The occupancy becomes 1 at the P3̄m1 to R3 transition and all the xenon atoms occupy the 3d sites in the high-pressure structure. These pressure-induced changes in occupancy coincide with volume changes that maintain the average Xe:H2 stoichiometry fixed at 1:8. The synchrotron x-ray diffraction and Raman measurements show that this unique hydrogen-bearing compound that can be synthesized at 4.2 GPa and 300 K, quenched at low temperatures to atmospheric pressure, and retained up to 90 K on subsequent warming.

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Mar 17, 2015·The Journal of Chemical Physics·Maddury SomayazuluRussell J Hemley

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Citations

Oct 3, 2015·The Journal of Chemical Physics·Xiaozhen YanShikai Xiang
Oct 22, 2015·Journal of the American Chemical Society·Mao-Sheng MiaoHai-Qing Lin
Mar 17, 2015·The Journal of Chemical Physics·Maddury SomayazuluRussell J Hemley
Mar 7, 2018·Nature Communications·Zhen LiuMao-Sheng Miao
Aug 11, 2020·The Journal of Chemical Physics·Piotr A GuńkaJanusz Zachara
Nov 23, 2016·Reports on Progress in Physics·Guoyin Shen, Ho Kwang Mao
Dec 2, 2020·Nature Communications·Matteo CeppatelliMaurizio Peruzzini

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