Volume 19 Issue 4
Apr 2015
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QIAO Er-Wei, ZHENG Hai-Fei. Stability of n-Pentane under High Pressure[J]. Chinese Journal of High Pressure Physics, 2005, 19(4): 371-376 . doi: 10.11858/gywlxb.2005.04.016
Citation: QIAO Er-Wei, ZHENG Hai-Fei. Stability of n-Pentane under High Pressure[J]. Chinese Journal of High Pressure Physics, 2005, 19(4): 371-376 . doi: 10.11858/gywlxb.2005.04.016

Stability of n-Pentane under High Pressure

doi: 10.11858/gywlxb.2005.04.016
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  • Corresponding author: ZHENG Hai-Fei
  • Received Date: 22 Sep 2004
  • Rev Recd Date: 21 Mar 2005
  • Publish Date: 05 Dec 2005
  • Raman scattering spectroscopy was used to investigate stability of n-pentane in Moissanite anvil cell from 0.07 GPa up to 4.77 GPa at ambient temperature. The result shows that CH3 symmetric and asymmetric stretching vibration, CH2 symmetric and asymmetric stretching vibration and -(CH2)n - in-phase twist mode at 2 877 cm-1, 2 964 cm-1, 2 856 cm-1, 2 935 cm-1 and 1 303 cm-1, respectively, shifted to higher frequency according to quasi-linearity with pressure increase, and an abrupt visible change was taken place, indicating that it is a sort of phenomenon of freezing at overpressurization. In addition, a high-pressure transition phase may appear in crystallized n-pentane in the range of 2.84~4.77 GPa. The equilibrium freezing pressure of n-pentane is (1.900.05) GPa at 27 ℃ by measuring with the method of crystal-liquid coexistence.

     

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