Highly ordered graphite (HOPG) to hexagonal diamond (lonsdaleite) phase transition observed on picosecond time scales using ultrafast x-ray diffraction
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- University of Nevada, Las Vegas, NV (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Carnegie Institute of Science, Washington, DC (United States)
- University of Potsdam (Germany)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- University of Freiburg (Germany)
- Stanford University, CA (United States)
Here, the response of rapidly compressed highly oriented pyrolytic graphite (HOPG) normal to its basal plane was investigated at a pressure of ~80 GPa. Ultrafast x-ray diffraction using ~100 fs pulses at the Materials Under Extreme Conditions sector of the Linac Coherent Light Source was used to probe the changes in crystal structure resulting from picosecond timescale compression at laser drive energies ranging from 2.5 to 250 mJ. A phase transformation from HOPG to a highly textured hexagonal diamond structure is observed at the highest energy, followed by relaxation to a still highly oriented, but distorted graphite structure following release. We observe the formation of a highly oriented lonsdaleite within 20 ps, subsequent to compression. This suggests that a diffusionless martensitic mechanism may play a fundamental role in phase transition, as speculated in an early work on this system, and more recent static studies of diamonds formed in impact events.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program; Defense Threat Reduction Agency (DTRA); US Army Research Office (ARO); Carnegie Institution of Washington; National Science Foundation (NSF); USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC02-76SF00515; AC52-07NA27344; SF00515; HDTRA1-16-1-0020; HDTRA1-20-2-0001; 56122-CH-H; 71650-CH W911NF-19-2-0172; EAR-1634415; FG02-94ER14466; 16-ERD-037; DEFG02-94ER14466
- OSTI ID:
- 1886935
- Alternate ID(s):
- OSTI ID: 1879254; OSTI ID: 1891225
- Report Number(s):
- LLNL-JRNL-822386; TRN: US2309743
- Journal Information:
- Journal of Applied Physics, Vol. 132, Issue 5; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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shock compression
shock waves
ultrafast x-ray diffraction
lasers
wave mechanics
phase transitions
crystal structure
carbon based materials
hydrodynamics simulations
diamond
Physics - Solid state physics
Materials science
Physics - Condensed matter physics
Chemistry
solid state physics
condensed matter physics
chemistry