Transformation of shock-compressed graphite to hexagonal diamond in nanoseconds [electronic resource].
- Published
- Washington, D.C. : United States. National Nuclear Security Administration, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy - Physical Description
- Article numbers eaao3,561 : digital, PDF file
- Additional Creators
- United States. National Nuclear Security Administration and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- The graphite-to-diamond transformation under shock compression has been of broad scientific interest since 1961. The formation of hexagonal diamond (HD) is of particular interest because it is expected to be harder than cubic diamond and due to its use in terrestrial sciences as a marker at meteorite impact sites. However, the formation of diamond having a fully hexagonal structure continues to be questioned and remains unresolved. Using real-time (nanosecond), in situ x-ray diffraction measurements, we show unequivocally that highly oriented pyrolytic graphite, shock-compressed along the c axis to 50 GPa, transforms to highly oriented elastically strained HD with the (100)HD plane parallel to the graphite basal plane. These findings contradict recent molecular dynamics simulation results for the shock-induced graphite-to-diamond transformation and provide a benchmark for future theoretical simulations. Additionally, our results show that an earlier report of HD forming only above 170 GPa for shocked pyrolytic graphite may lead to incorrect interpretations of meteorite impact events.
- Report Numbers
- E 1.99:1410676
- Subject(s)
- Note
- Published through SciTech Connect.
10/27/2017.
Science Advances 3 10 ISSN 2375-2548 AM
Stefan J. Turneaure; Surinder M. Sharma; Travis J. Volz; J. M. Winey; Yogendra M. Gupta.
Washington State Univ., Pullman, WA (United States). Institute for Shock Physics - Funding Information
- NA0002442
NA0002007
AC02-06CH11357
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