Abstract
The Raman spectroscopy ofn-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
CH3 and CH2 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 =
0.00737T2 + 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.
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