X-ray induced synthesis of 8H diamond

Zhongwu Wang, Yusheng Zhao, Chang Sheng Zha, Qing Xue, Robert T. Downs, Ren Guan Duan, Razvan Caracas, Xiaozhou Liao

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

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 languageEnglish (US)
Pages (from-to)3303-3307
Number of pages5
JournalAdvanced Materials
Volume20
Issue number17
DOIs
StatePublished - Sep 3 2008

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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