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Volume 29 Issue 1
Apr 2015
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Chinese Journal of High Pressure Physics  > 2015  >  29(1): 35-41.
MA Chun-Li, WU Xiao-Xin, HUANG Feng-Xian, LI Min, WANG Xiao-Xia, ZHOU Qiang, LI Fang-Fei, CUI Qi-Liang. Brillouin Scattering Study on Molecular Liquid under High Pressure and High Temperature Conditions[J]. Chinese Journal of High Pressure Physics, 2015, 29(1): 35-41. doi: 10.11858/gywlxb.2015.01.006
Citation: MA Chun-Li, WU Xiao-Xin, HUANG Feng-Xian, LI Min, WANG Xiao-Xia, ZHOU Qiang, LI Fang-Fei, CUI Qi-Liang. Brillouin Scattering Study on Molecular Liquid under High Pressure and High Temperature Conditions[J]. Chinese Journal of High Pressure Physics, 2015, 29(1): 35-41. doi: 10.11858/gywlxb.2015.01.006
shu

Brillouin Scattering Study on Molecular Liquid under High Pressure and High Temperature Conditions

doi: 10.11858/gywlxb.2015.01.006
  • 1.

    State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

  • 2.

    College of Science, Xi'an University of Science and Technology, Xi'an 710054, China

  • Received Date: 13 May 2013
  • Rev Recd Date: 28 Jul 2013
    Abstract
  • High-pressure and high-temperature Brillouin scattering studies have been performed on molecular liquids, including water (H2O), ammonia (NH3), ammonia dihydrate (NH3·2H2O) and methane (CH4) by using a diamond anvil cell (DAC).The acoustic velocity and adiabatic bulk modulus have been determined from measured Brillouin frequency shifts in both 180° and 60° scattering geometries under pressure up to freezing point, along room temperature (296 K) and high temperature (410 K) isotherms, and the pressure dependence of acoustic velocity and adiabatic bulk modulus were compared in different molecular systems.The acoustic velocities increase smoothly with the increasing pressure, methane possesses the highest velocity increasement and the lowest adiabatic bulk modulus under similar pressure and temperature, indicating the hydrogen bond impact on elasticity in these liquids.A change in the slope of pressure dependence of the bulk modulus in liquid ammonia dihydrate was observed around 1.5 GPa, suggesting a possible structure change in liquid and analysing the effect of hydrogen on elasticity.This study improves our understanding of the pressure- and temperature-induced molecular structure changes in other molecular liquid systems.

     

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