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Structure and stability of solid Xe(H2)n

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4908265· OSTI ID:1335840
 [1];  [2];  [3];  [4]
  1. Carnegie Institution of Washington, Washington, D.C. (United States); Carnegie Institution of Washington
  2. Univ. of Chicago, Argonne, IL (United States)
  3. Carnegie Institution of Washington, Argonne, IL (United States)
  4. Carnegie Institution of Washington, Washington, D.C. (United States)
+ Show Author Affiliations
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 P3¯m1 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 P3¯m1 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. Furthermore, 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.
Research Organization:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-06CH11357; FG02-06ER46280; FG02-99ER45775; NA0001974; NA0002006
OSTI ID:
1335840
Alternate ID(s):
OSTI ID: 1228238
OSTI ID: 22415510
OSTI ID: 1176794
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 10 Vol. 142; ISSN JCPSA6; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Prediction of the Reactivity of Argon with Xenon under High Pressures journal August 2019
References book June 2018
Reactivity of He with ionic compounds under high pressure journal March 2018
High-pressure studies with x-rays using diamond anvil cells journal November 2016

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