Time-Resolved Synchrotron X-ray Diffraction on Pulse Laser Heated Iron in Diamond Anvil Cell

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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, ... continued below

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Yoo, C S; Wei, H; Dias, R; Shen, G; Smith, J; Chen, J Y et al. September 21, 2011.

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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.

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PDF-file: 8 pages; size: 2 Mbytes

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  • Presented at: AIRAPT23, Mumbai, India, Sep 25 - Sep 30, 2011

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  • Report No.: LLNL-CONF-514751
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1035602
  • Archival Resource Key: ark:/67531/metadc840804

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Office of Scientific & Technical Information Technical Reports

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  • September 21, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 2, 2016, 3:44 p.m.

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Yoo, C S; Wei, H; Dias, R; Shen, G; Smith, J; Chen, J Y et al. Time-Resolved Synchrotron X-ray Diffraction on Pulse Laser Heated Iron in Diamond Anvil Cell, article, September 21, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc840804/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.