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Title: Subnanosecond phase transition dynamics in laser-shocked iron

Journal Article · · Science Advances
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  1. Yonsei Univ., Seoul (Korea, Republic of)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Pohang Accelerator Lab. (PAL) (Korea, Republic of)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Korea Polar Research Inst., Incheon (Korea, Republic of)
  7. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  8. Arizona State Univ., Tempe, AZ (United States)
  9. Univ. of South Carolina, Columbia, SC (United States)
  10. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Osaka Univ. (Japan)
  11. Yonsei Univ., Seoul (Korea, Republic of); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)

Iron is one of the most studied chemical elements due to its sociotechnological and planetary importance; hence, understanding its structural transition dynamics is of vital interest. By combining a short pulse optical laser and an ultrashort free electron laser pulse, we have observed the subnanosecond structural dynamics of iron from high-quality x-ray diffraction data measured at 50-ps intervals up to 2500 ps. We unequivocally identify a three-wave structure during the initial compression and a two-wave structure during the decaying shock, involving all of the known structural types of iron (α-, γ-, and ε-phase). In the final stage, negative lattice pressures are generated by the propagation of rarefaction waves, leading to the formation of expanded phases and the recovery of γ-phase. Our observations demonstrate the unique capability of measuring the atomistic evolution during the entire lattice compression and release processes at unprecedented time and strain rate.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA); Korean Ministry of Science and ICT (MSIP); Korea Polar Research Institute
Grant/Contract Number:
AC02-76SF00515; AC02-06CH11357; AC52-07NA27344
OSTI ID:
1635678
Alternate ID(s):
OSTI ID: 1638045; OSTI ID: 1783916
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 23 Vol. 6; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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