Journal article
Transformation of shock-compressed graphite to hexagonal diamond in nanoseconds
Science advances, Vol.3(10), pp.eaao3561-eaao3561
10/2017
Handle:
https://hdl.handle.net/2376/110266
PMCID: PMC5659656
PMID: 29098183
Abstract
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
axis to 50 GPa, transforms to highly oriented elastically strained HD with the (100)
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.
Metrics
9 Record Views
Details
- Title
- Transformation of shock-compressed graphite to hexagonal diamond in nanoseconds
- Creators
- Stefan J Turneaure - Institute for Shock Physics, Washington State University, Pullman, WA 99164, USASurinder M Sharma - Institute for Shock Physics, Washington State University, Pullman, WA 99164, USATravis J Volz - Department of Physics and Astronomy, Washington State University, Pullman, WA 99164, USAJ M Winey - Institute for Shock Physics, Washington State University, Pullman, WA 99164, USAYogendra M Gupta - Department of Physics and Astronomy, Washington State University, Pullman, WA 99164, USA
- Publication Details
- Science advances, Vol.3(10), pp.eaao3561-eaao3561
- Academic Unit
- Physics and Astronomy, Department of; Institute for Shock Physics
- Publisher
- United States
- Identifiers
- 99900547392401842
- Language
- English
- Resource Type
- Journal article