A new assembly for ultrasonic measurements of water and ice on multi-anvil apparatus has been designed, and the ultrasonic compressional wave velocities in water and ice up to 4.2 GPa and 500 K are achieved. The pressure of the sample is calibrated by the melting curve of ice VII and the transformation pressure of liquid to solid at ambient temperature. The continuous changing process of the sound velocity transforming from water into ice at high pressure is achieved, and the experimental results of sound velocities at high pressure at room temperature on the melting curve of water are consistent with the previous works by Brillouin scattering. It is believed that our new method of ultrasonic measurements of water is reliable, and worth being used for studying more liquids at high pressure.

Publication name	CHINESE PHYSICS LETTERS  Volume: 30   Issue: 5     Article Number: 054302   Published: MAY 2013
Author(s)	Wang Zhi-Gang; Liu Yong-Gang; Zhou Wen-Ge; Song Wei; Bi Yan; Liu Lei;Xie Hong-Sen
Corresponding author	LIU Yonggang  liuyg@yahoo.com   Chinese Acad Sci, Inst Geochem, Lab High Temp & High Pressure Study Earths Interi, Guiyang 550002, Peoples R China.

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