Abstract

<b>The Raman spectroscopy of</b> <b><i>n</i>-heptane was investigated in a moissanite anvil cell at ambient temperatures and a diamond anvil cell under pressures of up to ∼2000 MPa and at temperature range from 298 to 588 K. The results show that at room temperature the vibration modes, assigned to the symmetric and antisymmetric stretching of CH<sub>3</sub> and CH<sub>2</sub> stretching, shifted to higher frequency according to quasi-linearity with increasing pressure, and a liquid-solid phase transition occurred at near 1150 MPa. The high-temperature solidus line of <i>n</i>-heptane follows a quadratic function of <i>P</i> = 0.00737<i>T</i><sup>2</sup> + 5.27977<i>T</i> − 1195.76556. Upon phase change, fitting the experimental data obtained in the temperature range of 183∼412 K to the Clausius-Clapeyron equation allows one to define the thermodynamic parameters of <i>n</i>-heptane of d<i>P</i>/d<i>T</i> = 0.01474<i>T</i> + 5.27977.</b>

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