TY - JOUR
T1 - High-pressure X-ray absorption fine structure in the diamond anvil cell and its applications in geological materials
AU - Hong, Xinguo
AU - Newville, Matthew
AU - Duffy, Thomas S.
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - Although coupling the X-ray absorption fine structure (XAFS) technique to the diamond anvil cell (DAC) has long been recognized as potentially important for understanding the behavior and evolution of the local and electronic structure of matter under extreme conditions, the DAC has been regarded as poorly suited for XAFS due to the DAC imposed glitches. Recently, an iterative method was proposed to distinguish and eliminate the serious interference of the diamond Bragg peaks, and succeeded in acquiring high quality 'reflection-free' XAFS spectra at high pressure under the DAC environment. In this paper, we use this method and present demonstration XAFS spectra for GeO2 glass, which is the archetype of network forming glasses with important geophysical implications, at pressures to 64 GPa. This is far above the change in coordination from tetrahedra to octahedra occurring at 6-13 GPa. The results provide important insight into the structural polymorphism of GeO2 glass at high pressure.
AB - Although coupling the X-ray absorption fine structure (XAFS) technique to the diamond anvil cell (DAC) has long been recognized as potentially important for understanding the behavior and evolution of the local and electronic structure of matter under extreme conditions, the DAC has been regarded as poorly suited for XAFS due to the DAC imposed glitches. Recently, an iterative method was proposed to distinguish and eliminate the serious interference of the diamond Bragg peaks, and succeeded in acquiring high quality 'reflection-free' XAFS spectra at high pressure under the DAC environment. In this paper, we use this method and present demonstration XAFS spectra for GeO2 glass, which is the archetype of network forming glasses with important geophysical implications, at pressures to 64 GPa. This is far above the change in coordination from tetrahedra to octahedra occurring at 6-13 GPa. The results provide important insight into the structural polymorphism of GeO2 glass at high pressure.
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U2 - 10.1088/1742-6596/430/1/012120
DO - 10.1088/1742-6596/430/1/012120
M3 - Conference article
AN - SCOPUS:84877349821
VL - 430
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012120
T2 - 15th International Conference on X-Ray Absorption Fine Structure, XAFS 2012
Y2 - 22 July 2012 through 28 July 2012
ER -