Based on large volume press and conventional pulse-echo ultrasonic technique, we have overcome the difficulty in determining the length of liquid specimen under high pressure, and the sound velocity in liquid Na has been measured up to 2 GPa. The P-V data deduced by our sound velocity results through equation of state is in an excellent agreement with previous data directly determined by piezometer method. This new experimental technique is convenient and ready for use, being expected to advance investigation on thermodynamic properties of liquid metals and other melts under high pressure. (C) 2011 American Institute of Physics. [doi:10.1063/1.3625267]

Publication name	REVIEW OF SCIENTIFIC INSTRUMENTS　Volume:82 　Issue:8 　　Article Number:086108　 Published:AUG 2011
Author(s)	Song, Wei; Liu, Yonggang; Wang, Zhigang; Gong, Chaoying; Guo, Jie; Zhou, Wenge; Xie, Hongsen
Corresponding author	LIU Yonggang  liuyg@yahoo.com  Chinese Acad Sci, Inst Geochem Earths Deep Interior Mat & Fluid Int, Guiyang 550002, Peoples R China

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