Rotator Phases of n-Heptane under High Pressure: Raman Scattering and X-ray Diffraction Studies

Journal Article · Sat Dec 31 04:00:00 EST 2011 · Journal of Physical Chemistry C

DOI:https://doi.org/10.1021/jp112333m· OSTI ID:1042225

Ma, C; Zhou, Q; Li, F; Hao, J; Shu, J; Huang, L; Huang, F; Cui, Q

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 LABORATORY (BNL)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1042225
• Report Number(s): BNL--97903-2012-JA
• Journal Information: Journal of Physical Chemistry C, Journal Name: Journal of Physical Chemistry C Journal Issue: 37 Vol. 115; ISSN 1932-7447
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALKANES
SCATTERING
SYNCHROTRONS
X-RAY DIFFRACTION