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Title: Hexafluorobenzene under extreme conditions

Here, we report the results from three high pressure expts. on hexafluorobenzene (C 6F 6). In the first expt., Raman spectra were recorded up to 34.4 GPa. A phase transition from I → II was obsd. near 2 GPa. Near 8.8 GPa, a phase transition to an unreported phase (III) commenced. Above 20.6 GPa, yet another phase was obsd. (IV). Pressure cycling was employed to det. that, below 25.6 GPa, all pressure-induced alterations were reversible. However, at pressures above 20 GPa, dramatic spectral changes and broadening were obsd. 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 expt., 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 expt. 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 obsd. Near 25.6 GPa long-range cryst. order was lost as the X-ray diffraction spectrum presented evidence of an amorphous solid.
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  1. Univ. of Nevada, Las Vegas, NV (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
Additional Journal Information:
Journal Volume: 120; Journal Issue: 10; Journal ID: ISSN 1520-6106
American Chemical Society
Research Org:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; high pressure physics and chemistry; novel synthesis; infrared spectroscopy; Raman spectroscopy; diamond anvil cell; high pressure; x-ray diffraction; fluorine chemistry; polymerization
OSTI Identifier: