Abstract
The samples of predominantly 8H diamond polytype can be synthesized at ambient pressure by intense 20 kW synchrotron X-ray radiation at CHESS (Cornell High Energy Synchrotron Source) wiggler beam line was investigated. Low-magnification Transmission Electron Microscopy (TEM) images revealed that the X-ray-induced carbon displays a particular lamellar morphology, and selected area electron diffraction (SAED) patterns display 12 symmetrical spots with d-spacings that range from 1.99 to 2.14 Å. Synchrotron X-ray diffraction measurements together with simulations of the patterns were used to confirm the hexagonal structure. It was observed that an energetic high-temperature environment favors the nucleation of 3C and 2H diamond with a critical particle size of 2 nm, in which dislocations and stacking faults are not stable.
Original language | English (US) |
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Pages (from-to) | 3303-3307 |
Number of pages | 5 |
Journal | Advanced Materials |
Volume | 20 |
Issue number | 17 |
DOIs | |
State | Published - Sep 3 2008 |
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering