Detonation-induced transformation of graphite to hexagonal diamond
Journal Article
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· Physical Review B
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- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
- Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- 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 Lab. (ANL), Argonne, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Washington State Univ., Pullman, WA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC02-06CH11357; AC52-07NA27344; 18-SI-004; NA0002442; AC0206CH11357; NA0003957
- OSTI ID:
- 1756096
- Alternate ID(s):
- OSTI ID: 1669243; OSTI ID: 1680030
- Report Number(s):
- LLNL-JRNL-812742; 162668; TRN: US2206001
- Journal Information:
- Physical Review B, Vol. 102, Issue 10; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
58 GEOSCIENCES
Pressure effects
Shock waves
Structural phase transition
Structural properties
Graphite
Density functional calculations
Pressure techniques
X-ray diffraction
shock waves
structural phase transition
structural properties
graphite
density functional calculations
pressure techniques
x-ray diffraction
58 GEOSCIENCES
Pressure effects
Shock waves
Structural phase transition
Structural properties
Graphite
Density functional calculations
Pressure techniques
X-ray diffraction
shock waves
structural phase transition
structural properties
graphite
density functional calculations
pressure techniques
x-ray diffraction