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Detonation-induced transformation of graphite to hexagonal diamond

Journal Article · · Physical Review B
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Washington State Univ., Argonne, IL (United States). Inst. for Shock Physics, Dynamic Compression Sector (DCS)
  3. Washington State Univ., Argonne, IL (United States). Inst. for Shock Physics, Dynamic Compression Sector (DCS); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
In this work, we explore the structural evolution of highly oriented pyrolytic graphite (HOPG) under detonation-induced shock conditions using in situ synchrotron x-ray diffraction in the ns timescale. We observe the formation of hexagonal diamond (lonsdaleite) at pressures above 50 GPa, in qualitative agreement with recent gas gun experiments. First-principles density functional calculations reveal that under uniaxial compression, the energy barrier for the transition toward hexagonal diamond is lower than that for cubic diamond. Finally, no indication of cubic diamond formation was observed up to >70 GPa.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-06CH11357; AC52-07NA27344; NA0002442; NA0003957
OSTI ID:
1669243
Alternate ID(s):
OSTI ID: 1756096
OSTI ID: 1680030
Report Number(s):
LLNL-JRNL--812742; 1019619
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 102; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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