An experimental investigation of n-hexane at high temperature and pressure

作者：Qiao, Erwei^*; Zheng, Haifei

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2018, 203: 210-213.

DOI：10.1016/j.saa.2018.05.093

• n-Hexane
• Phase diagram
• High temperature
• Thermodynamic parameter
• Hydrothermal diamond anvil cell
• Raman spectroscopy

At present, no high temperature experiments on phase change are reported. In this study, we have measured the Raman bands v(s)(CH3), v(s)(CH2), v(as)(CH3), and v(as)(CH2) of n-hexane in a hydrothermal diamond cell up to 588 K. We determined that the liquid-solid phase transition pressure of n-hexane is 1.17 GPa, and we also gave a number of high temperatures and pressures data on phase change which are not reported previously. In addition, we defined the solidus of n-hexane which can be represented by the equation P = 8.581T-1550.16, and the relation dP/dT = 8.581 which can be used to calculate the thermodynamic parameters for n-hexane in the liquid -solid phase transition. For all we know, the above two equations are presented here for the first time. Furthermore, it is the first report here in a graphic way on high-temperature phase change in n-hexane, and it is also the first to be shown in the 3-D figure.

• 出版日期2018-10-5
• 单位北京大学; 中国地质科学院地质力学研究所