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A Direct Comparison between Static and Dynamic Melting Temperature Determinations below 100GPa |
| SUN Yu-Huai1,3;HUANG Hai-Jun2;LIU Fu-Sheng1;YANG Mei-Xia1;JING Fu-Qian1,2 |
| 1Institute of High Temperature and High Pressure Physics, Southwest Jiaotong University, Chengdu 610031
2Laboratory for Shock Wave and Detonation Physics Research, Southwest Institute of Fluid Physics, Mianyang 621900
3Institute of Mathematics and Software Science, Sichuan Normal University, Chengdu 610066 |
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| Cite this article: |
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SUN Yu-Huai, HUANG Hai-Jun, LIU Fu-Sheng et al 2005 Chin. Phys. Lett. 22 2002-2004 |
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Abstract A preliminary experiment of sound velocity measurements for porous iron with initial average density of 6.275g/cm3 has been performed at pressures below 100GPa, in order to clarify a long-standing problem that the static melting temperature Tm, mostly below 100GPa due to its technical limitations, is notably lower than the extrapolated melting data inferred from the shock wave experiments made above 200GPa, 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 Tm=3200K at 87GPa and Tm=3080K at 80GPa, which are in good agreement with the two latest static data of Tm=3510K at 105GPa and Tm=2750K at 58GPa, which utilized modern improved double-side laser heating and in situ accurate x-ray diffraction techniques in experiments. It can be concluded that consensus Tm data would be obtained from static and shock wave experiments in the case that the recently improved techniques are adopted in investigations.
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| Keywords:
62.50.+p
64.70.Dv
64.10.+h
91.35.Ed
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Published: 01 August 2005
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62.50.+p
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64.70.Dv
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64.10.+h
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(General theory of equations of state and phase equilibria)
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91.35.Ed
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(Structure of the Earth's interior below the upper mantle)
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