| Time-resolved x-ray diffraction of Krypton liquid-solid transition | |
| Abstract ID | 23 |
| Presenter | Jing-Yin Chen |
| Presentation Type | Poster |
| Full Author List | Jing-Yin Chen1, Hyunchae Cynn1, Choong-Shik Yoo2 and William Evans1 |
| Affiliations |
1High Pressure Physics Group, Lawrence Livermore National Laboratory, Livermore |
| Category | |
| Abstract |
We describe high-pressure kinetic studies of the solidification, melting and FCC-HCP transitions of Krypton under dynamic loading conditions, using a dynamic-diamond anvil cell (d-DAC) coupled with time-resolved x-ray diffraction. The time-resolved diffraction patterns and dynamic pressure responses show compression-rate dependences associated with both the decay and growth time constants of the liquid-solid and solid-liquid transitions. According to the Avrami equation, both the solidified and melting processes are spontaneous nucleation and a rod-like (1-D) growth. Furthermore, under dynamic loading conditions, Kr-HCP forms from FCC around the melting line. The nucleation time of FCC and HCP are very fast, and independent of compression rates. The threshold pressure for the formation of Kr-HCP is ~ 0.8 GPa at the dynamic loadings of 0.004-13 GPa/s. https://conf-slac.stanford.edu/ssrl-lcls-2013/sites/conf-slac.stanford.e... |
| Footnotes | |
| Funding Acknowledgement | *This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory in part under contract W-7405-Eng-48 and in part under Contract DE-AC52-07NA27344. This work was funded by the Laboratory Directed Research and Development Program at LLNL under project tracking code 11-ERD-046. This research were carried out at the beamline ECB P02 at Petra III at DESY, a member of the Helmholtz Association (HGF). We would like to thank H.P. Lierrmann and beamline scientists for assistance. |