Time-Resolved Synchrotron X-ray Diffraction on Pulse Laser Heated Iron in Diamond Anvil Cell
The authors present time-resolved synchrotron x-ray diffraction to probe the {var_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 * 10{sup -6}/K for {var_epsilon}-Fe and 2.4 * 10{sup -5}/K for {gamma}-Fe, as well as the evidence for metastability of {gamma}-Fe at low temperatures below the {var_epsilon}-{gamma} phase boundary.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 1035602
- Report Number(s):
- LLNL-CONF-514751
- Country of Publication:
- United States
- Language:
- English
Phase Diagram of Iron by in Situ X-ray Diffraction: Implications for Earth's Core
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journal | December 1995 |
Temperatures in the Earth's core from melting-point measurements of iron at high static pressures
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journal | June 1993 |
Melting, thermal expansion, and phase transitions of iron at high pressures
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journal | January 1990 |
Melting and crystal structure of iron at high pressures and temperatures
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journal | February 1998 |
Laser heated diamond cell system at the Advanced Photon Source for in situ x-ray measurements at high pressure and temperature
|
journal | January 2001 |
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