skip to main content

Title: X-ray induced mobility of molecular oxygen at extreme conditions

We report an in situ Raman study of KClO{sub 4} irradiated with x-rays in a diamond anvil cell. Decomposition via KClO{sub 4} + hv → KCl + 2O{sub 2} was monitored via the O{sub 2} vibron at 2 GPa, 6 GPa, and 9 GPa. For all pressures, the vibron grew in intensity and then diminished after successive irradiation suggesting that O{sub 2} was diffusing away from the irradiated region. Surprisingly, the diffusion rate accelerated with pressure increase, indicating that the nonhydrostatic pressure gradient was likely driving molecular diffusion of oxygen. At 9 GPa, the vibron bifurcated suggesting that O{sub 2} exists as two forms: interstitial and bulk solid. This method can be employed to study molecular diffusion under extreme conditions.
Authors:
; ; ;  [1] ; ;  [2]
  1. High Pressure Science and Engineering Center (HiPSEC) and Department of Physics, University of Nevada Las Vegas (UNLV), Las Vegas, Nevada 89154-4002 (United States)
  2. HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, 9700 South Cass Ave., Argonne, Illinois 60437 (United States)
Publication Date:
OSTI Identifier:
22217839
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 22; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DECOMPOSITION; DIAMONDS; DIFFUSION; INTERSTITIALS; IRRADIATION; MOBILITY; OXYGEN; POTASSIUM CHLORIDES; POTASSIUM PERCHLORATES; PRESSURE GRADIENTS; PRESSURE RANGE GIGA PA; RAMAN SPECTRA; SOLIDS; X RADIATION