title: In situ high-pressure and high-temperature experiments on n-heptane.
abstract: The Raman spectroscopy of n-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(3) and CH(2) 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 n-heptane follows a quadratic function of P = 0.00737T(2) + 5.27977T - 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 n-heptane of dP/dT = 0.01474T + 5.27977.
authors.affiliation: Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China.
authors.forename: Erwei
authors.initials: E
authors.lastname: Qiao
authors.forename: Haifei
authors.initials: H
authors.lastname: Zheng
authors.forename: Changxing
authors.initials: C
authors.lastname: Long