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Abstract
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.
Acknowledgements
The authors acknowledge the support from the National Natural Science Foundation of China (NNSFC) under contract 40974052, the Knowledge Innovation Program of the Chinese Academy of Sciences under contract KZCX2-YW-Q08–3-4, as well as the Mutual Foundation of Huge Scientific Equipment of National Natural Science Foundation of China and Chinese Academy of Science under contract 10979053. We thank Professor Wenge Zhou at the Institute of Geochemistry in the Chinese Academy of Sciences for helpful discussion.