Under high-temperature and high pressure (HTHP) experiments, materials of small elastic modulus deform easily, and the length of the sample can be hardly predicted which lead to failure of ultrasonic velocity measurement. In this paper, a hydrostatic assembly of the sample for ultrasonic measurements is designed under HPHT, which can prevent plastic deformation. According to the abrupt change of travel time of the sample across the different phase boundaries of bismuth, the correspondent relation of sample pressure and oil pressure of multi-anvil apparatus can be calibrated, and the relation of sample temperature and temperature measured by thermocouple can also be determined. Sample pressure under high temperature is also determined by ultrasonic results. It is believed that the new sample assembly of hydrostatic pressure is valid and feasible for ultrasonic experiments under HTHP.

Publication name	HIGH PRESSURE RESEARCH　Volume: 32 　Issue: 2 　Pages: 167-175　 Published: 2012
Author(s)	Wang, Zhigang; Liu, Yonggang; Bi, Yan; Song, Wei; Xie, Hongsen
Corresponding author	LIU Yonggang  liuyg@yahoo.com  Chinese Acad Sci, Inst Geochem, Guiyang 590002, Peoples R China.

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