Time-Resolved Synchrotron X-ray Diffraction on Pulse Laser Heated Iron in Diamond Anvil Cell
Journal Article
·
· Journal of Physics: Conference Series
- LLNL
We present time-resolved synchrotron x-ray diffraction to probe the {epsilon}-{delta} phase transition of iron during pulse-laser heating in a diamond anvil cell. The system utilizes a monochromatic synchrotron x-ray beam, a two-dimensional pixel array x-ray detector and a dual beam, double side laser-heating system. Multiple frames of the diffraction images are obtained in real-time every 22 ms over 500 ms of the entire pulse heating period. The results show the structural evolution of iron phases at 17 GPa, resulting in thermal expansion coefficient 1/V({Delta}V/{Delta}T){sub p} = 7.1 x 10{sup -6}/K for {epsilon}-Fe and 2.4 x 10{sup -5}/K for {gamma}-Fe, as well as the evidence for metastability of {gamma}-Fe at low temperatures below the {epsilon}-{gamma} phase boundary.
- Research Organization:
- Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
- Sponsoring Organization:
- NSFDHS -- Department of Homeland Security
- OSTI ID:
- 1047322
- Journal Information:
- Journal of Physics: Conference Series, Journal Name: Journal of Physics: Conference Series Journal Issue: 1 Vol. 377
- Country of Publication:
- United States
- Language:
- ENGLISH
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