Add time:08/28/2019         Source:sciencedirect.com

At present, no high temperature experiments on phase change are reported. In this study, we have measured the Raman bands νs(CH3), νs(CH2), νas(CH3), and νas(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.

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