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Chinese Journal of High Pressure Physics  > 2013  >  27(4): 490-494.
WANG Hui-Yuan, ZHENG Hai-Fei. Liquid-Liquid Phase Transition of Water at High Pressure and Ambient Temperature[J]. Chinese Journal of High Pressure Physics, 2013, 27(4): 490-494. doi: 10.11858/gywlxb.2013.04.003
Citation: WANG Hui-Yuan, ZHENG Hai-Fei. Liquid-Liquid Phase Transition of Water at High Pressure and Ambient Temperature[J]. Chinese Journal of High Pressure Physics, 2013, 27(4): 490-494. doi: 10.11858/gywlxb.2013.04.003
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Liquid-Liquid Phase Transition of Water at High Pressure and Ambient Temperature

doi: 10.11858/gywlxb.2013.04.003

  • Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Science, Peking University, Beijng 100871, China

  • Received Date: 05 Feb 2012
  • Rev Recd Date: 05 Mar 2012
  • Publish Date: 15 Aug 2013
    Abstract
  • In-situ Raman measurement of water has been conducted at the temperature of 300 K and the pressure of 0.1-1 400 MPa using a SiC anvil cell. The experimental results show that the frequency of liquid water 1 decreases with increase of pressure (p), and two discontinuities are observed at about 200 and 620 MPa. Therefore three states of water are recognized. From state Ⅰ to state Ⅱ then to state III, the value of |d1/dp| reduces, indicating that the compressibility is related to the pressure, and it is becoming more difficult to compress as the pressure is increasing. The connection mode of a water molecule with its neighboring water molecules changes as the pressure increases. The discontinuous property of water suggests a possible liquid to liquid phase transition and structural change at 200 and 620 MPa.

     

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