Abstract Details
27 / 2023-04-02 05:54:54
Peculiarity of diamond melting on the Hugoniot
shock compression,,diamond,melting,phase transition
Abstract Accepted
The phase diagram of carbon at high pressures and temperatures is crucial for understanding the properties of interiors of ice giants [1-2]. BC8 over ~1 TPa were suggested by theory as the stable post diamond phase with the bc8-diamond-liquid triple point at a pressure of ~1 TPa [3]. Shock Hugoniot data and melting temperature of diamond have been studied by dynamic compressions to TPa pressures [4-5]. However, there is no consensus of the location of the melting curve and the triple point yet, and in-situ X-ray diffraction measurements indicated the high metastability of diamond over 1 TPa [6]. This situation requires further investigations. We try to observe diamond single crystal shocked over 1 TPa using decaying shock technique at SGIII prototype laser facility in China. We employed the standard techniques of line VISAR (for shock velocity (Us) measurement) and SOP (T measurement).The VISAR indicated shock velocity change down to ~20.5 km/s. Us-time and R-time were analyzed in VISAR-SOP data and T- P were calculated during the decaying shock of diamond. The significant differences were indicated from the previous studies [5] on R-Us relation and T-P of shocked diamond to 1.4 TPa by our new experimental results. The T shifts to lower side by ~1000-1500 K and the R shows initial increasing, subsequent slight decreasing, and final increasing to ~0.5. These results can be explained along with the phase relations during the decaying shock from the Hugoniot. When the metastable diamond is compressed further over the metastable extended boundary between diamond and BC8, BC8 can crystallize. Energy input by shock compression at this stage will not effectively increase the amount of melt and hinders the T increase by the crystallization. This corresponds to the triple point. Further compression of diamond will follow the melting curve of BC8 and along the Hugoniot of liquid with high R values to ~0.5. We are simulating to confirm our experimental results. Furthermore, the observed melting behaviors for shocked diamond provides new critical constrain on theoretical calculation and may affect prospect of understanding carbon in the interiors of large ice giants and design of ICF ignition process.
Important Date
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Conference Date
Jun 05
2023
toJun 09
2023
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Apr 30 2023
Early Bird Registration
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May 01 2023
Abstract Submission Deadline
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May 01 2023
Abstract Notification of Acceptance
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May 01 2023
Draft paper submission deadline
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May 31 2023
Registration deadline
Sponsored By
Science and Technology on Plasma Physics Laboratory
Department of Astronomy, Beijing Normal University
Department of Astronomy, Beijing Normal University
Organized By
Matter and Radiation at Extremes
Institute of Fluid Physics, China Academy of Engineering Physics, China
Institute of Applied Physics and Computational Mathematics, Beijing, China
Institute of Fluid Physics, China Academy of Engineering Physics, China
Institute of Applied Physics and Computational Mathematics, Beijing, China
Contact Information
- Contact
- mr******@aip.org
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