Rotator Phases of n-Heptane under High Pressure: Raman Scattering and X-ray Diffraction Studies
Journal Article
·
· Journal of Physical Chemistry C
We performed high-pressure Raman scattering and angle-dispersive synchrotron X-ray diffraction measurements on n-heptane at room temperature. It has been found that n-heptane undergoes a liquid to rotator phase III (R{sub III}) transition at 1.2 GPa and then transforms into another rotator phase R{sub IV} at about 3 GPa. As the pressure reaches 7.5 GPa, a transition from an orientationally disordered R{sub IV} phase to an ordered crystalline state starts and is completed around 14.5 GPa. Our results clearly present the high-pressure phase transition sequence (liquid-R{sub III}-R{sub IV}-crystal) of n-heptane, similar to that of normal alkanes.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE SC OFFICE OF SCIENCE (SC)
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1042225
- Report Number(s):
- BNL-97903-2012-JA; TRN: US201212%%636
- Journal Information:
- Journal of Physical Chemistry C, Vol. 115, Issue 37; ISSN 1932-7447
- Country of Publication:
- United States
- Language:
- English
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