常温高压下水的液-液相变

王慧媛; 郑海飞

doi:10.11858/gywlxb.2013.04.003

常温高压下水的液-液相变

doi: 10.11858/gywlxb.2013.04.003

王慧媛,
郑海飞^,

北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室，北京 100871

详细信息

通讯作者:
郑海飞 E-mail:hfzheng@pku.edu.cn

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出版历程
- 收稿日期: 2012-02-05
- 修回日期: 2012-03-05
- 发布日期: 2013-08-15

Liquid-Liquid Phase Transition of Water at High Pressure and Ambient Temperature

WANG Hui-Yuan,
ZHENG Hai-Fei^,

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

摘要

摘要: 在300 K、0.1～1 400 MPa条件下，利用碳化硅压腔，进行了液态水的拉曼光谱测量和研究。实验结果表明：随着压力的增大，水的对称伸缩振动峰（1）整体向低频方向移动，但在约200和620 MPa处存在不连续，可明显分为3个区间（Ⅰ、Ⅱ、Ⅲ）；水从状态Ⅰ到状态Ⅱ再到状态Ⅲ，其拉曼位移对压力p的变化率（|d1/dp|）减小，表明水变得越来越难以压缩；随着压力的改变，相邻的五水分子聚合体之间的连接方式发生了变化。这些性质表明，液态水在约200和620 MPa处可能存在着液-液相转变。
- 高压 /
- 不连续 /
- 拉曼光谱 /
- 连接方式 /
- 液-液相变
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.
- high pressure /
- discontinuity /
- Raman spectra /
- mode of connection /
- liquid-liquid phase transition

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