A direct comparison between static and dynamic melting temperature determinations below 100 GPa

作者：Sun YH; Huang HJ; Liu FS; Yang MX; Jing FQ^*

来源：Chinese Physics Letters, 2005, 22(8): 2002-2004.

A preliminary experiment of sound velocity measurements for porous iron with initial average density of 6.275 g/cm(3) has been performed at pressures below 100 GPa, in order to clarify a long-standing problem that the static melting temperature Tm, mostly below 100 GPa due to its technical limitations, is notably lower than the extrapolated melting data inferred from the shock wave experiments made above 200 GPa, for the sake of making a direct comparison between the experimental static and dynamic melting temperatures in the same pressure region. With the lately proposed Hugoniot sound velocity data analysis technique [Chin. Phys. Lett. 22 (2005) 863], the results deduced from this Hugoniot sound velocity measurement is T-m = 3200 K at 87 GPa and T-m = 3080 K at 80 GPa, which are in good agreement with the two latest static data of T-m = 3510 K at 105 GPa and T-m = 2750 K at 58 GPa, which utilized modern improved double-side laser heating and in situ accurate x-ray diffraction techniques in experiments. It can be concluded that consensus Tin data would be obtained from static and shock wave experiments in the case that the recently improved techniques are adopted in investigations.

• 出版日期2005-8
• 单位西南交通大学; 四川师范大学; 中国工程物理研究院流体物理研究所