Hexafluorobenzene under Extreme Conditions
Document Type
Article
Publication Date
1-1-2016
Publication Title
Journal of Physical Chemistry B
Volume
120
Issue
10
First page number:
2854
Last page number:
2858
Abstract
We report the results from three high pressure experiments on hexafluorobenzene (C6F6). In the first experiment, Raman spectra were recorded up to 34.4 GPa. A phase transition from I → II was observed near 2 GPa. Near 8.8 GPa, a phase transition to an unreported phase (III) commenced. Above 20.6 GPa, yet another phase was observed (IV). Pressure cycling was employed to determine that, below 25.6 GPa, all pressure-induced alterations were reversible. However, at pressures above 20 GPa, dramatic spectral changes and broadening were observed at 25.6 and 34.4 GPa. The sample irreversibly changed into a soft solid with waxlike consistency when pressure was reduced to ambient and was recoverable. In the second experiment, IR spectra were collected up to 14.6 GPa. The phase transition (II → III) near 8.8 GPa was confirmed. An angular dispersive X-ray diffraction experiment was conducted to 25.6 GPa. Phase transitions above 1.4 GPa (I → II), above 5.5 GPa (II → III), above 10 GPa (III → IV), and above 15.5 GPa (IV → V) were observed. Near 25.6 GPa, long-range crystalline order was lost as the X-ray diffraction spectrum presented evidence of an amorphous solid. © 2016 American Chemical Society.
File Format
File Size
1940 KB
Language
English
Repository Citation
Pravica, M.,
Sneed, D.,
Wang, Y.,
Smith, Q.,
White, M.
(2016).
Hexafluorobenzene under Extreme Conditions.
Journal of Physical Chemistry B, 120(10),
2854-2858.
http://dx.doi.org/10.1021/acs.jpcb.6b00497
