A Revisited Mechanism of the Graphite-to-Diamond Transition at High Temperature
- University of Nevada, Las Vegas, NV (United States); Sun Yat-Sen University, Guangzhou (China); OSTI
- Southern University of Science and Technology (SUSTech), Shenzhen (China)
- Jingchu University of Technology, Jingmen (China)
- Skolkovo Institute of Science and Technology, Moscow (Russia)
- University of Nevada, Las Vegas, NV (United States)
The graphite-diamond transition, under high-pressure and high-temperature conditions, has been a central subject in physical science. However, its atomistic mechanism remains under debate. Employing large-scale molecular dynamics (MD) simulations, we report a mechanism whereby the diamond nuclei in the graphite matrix propagate in two preferred directions, among which the graphite [120] is about 2.5 times faster than [001]. Consequently, cubic diamond (CD) is the kinetically favorable product, while only a few hexagonal diamonds (HDs) can exist as the twins of CDs. The coherent interface of t-(100)gr//(11-1)cd + [010]gr//[1-10]cd observed in MD simulation was confirmed by our high-resolution transmission electron microscopy experiment. This proposed mechanism not only clarifies the role of HD in graphite-diamond transition but also yields atomistic insight into strengthening synthetic diamond via microstructure engineering.
- Research Organization:
- University of Nevada, Las Vegas, NV (United States); University of Nevada, Reno, NV (United States)
- Sponsoring Organization:
- Extreme Science and Engineering Discovery Environment (XSEDE); National Natural Science Foundation of China (NSFC); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0001982
- OSTI ID:
- 1801053
- Journal Information:
- Matter (Online), Journal Name: Matter (Online) Journal Issue: 3 Vol. 3; ISSN 2590-2385
- Publisher:
- Cell Press/ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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