Dispersing InP Nanocrystals in Nano-polycrystalline Diamond during the Direct Conversion from Graphite

Rei Fukuta, Naoya Yamamoto, Yohei Murakami, Fumitaro Ishikawa, Hiroaki Ohfuji, Toru Shinmei, Tetsuo Irifune

Research output: Contribution to journalArticlepeer-review


We disperse InP nanocrystals into nano-polycrystalline diamond during the direct conversion from graphite as a possible technique to control its solid-state properties. We synthesize diamond, using the high-pressure, high-temperature technique, which encapsulates an InP alloy in close contact with the graphite starting material. X-ray diffraction of the synthesized sample suggests the formation of polycrystalline diamond where the mixed crystals contain InP. Cross-sectional transmission electron microscopy shows the existence of InP nanocrystals with sizes up to approximately 100 nm. The existence of the InP elements can promote the formation of larger crystalline diamond grains arising from liquid sintering, which show a larger grain size over 400nm compared with the regions without InP, where a grain size of approximately 50 nm is observed.

Original languageEnglish
Pages (from-to)1707-1710
Number of pages4
JournalMaterials Transactions
Issue number9
Publication statusPublished - 2020 Sep 1
Externally publishedYes


  • High pressure and high temperature
  • InP
  • Nano-polycrystalline diamond
  • Nanocrystal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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