Phase Transition of Heptane under Pressure
- Washington State University, Pullman, WA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Washington State University, Pullman, WA (United States)
A solid-to-solid phase transition was discovered in n-heptane with an onset at a pressure of 1.7 ± 0.1 GPa, evidenced by a discontinuity in the pressure–volume equation of state obtained from synchrotron X-ray diffraction experiments conducted at room temperature. The phase transition also resulted in discontinuous shifts of vibrational peaks in the infrared spectra. No additional phase transitions were detected up to 10 GPa, contradicting an earlier claim of a phase transition at 3 GPa. Furthermore, the hydrostatic limit of heptane in a diamond anvil cell was estimated to be 3.5 GPa. Above that pressure, the stress state is not well-defined, which may explain prior reports of a phase transition at 7.5 GPa.
- Research Organization:
- Washington State Univ., Pullman, WA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- NA0003957; FG02-07ER46386; AC02-05CH11231; AC52-07NA27344
- OSTI ID:
- 2305369
- Alternate ID(s):
- OSTI ID: 2315025; OSTI ID: 2325291
- Report Number(s):
- LLNL-JRNL-857175
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 128, Issue 5; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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