Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa

Tetsuo Irifune, Chiaki Ueda, Shohei Ohshita, Hiroaki Ohfuji, Takehiro Kunimoto, Toru Shinmei

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Nano-polycrystalline diamond (NPD) with various grain sizes has been synthesized from glassy carbon at pressures 15–25 GPa and temperatures 1700–2300°C using multianvil apparatus. The minimum temperature for the synthesis of pure NPD, below which a small amount of compressed graphite was formed, significantly increased with pressure from ∼1700°C at 15 GPa to ∼1900°C at 25 GPa. The NPD having grain sizes less than ∼50 nm was synthesized at temperatures below ∼2000°C at 15 GPa and ∼2300°C at 25 GPa, above which significant grain growth was observed. The grain size of NPD decreases with increasing pressure and decreasing temperature, and the pure NPD with grain sizes less than 10 nm is obtained in a limited temperature range around 1800–2000°C, depending on pressure. The pure NPD from glassy carbon is highly transparent and exhibits a granular nano-texture, whose grain size is tunable by selecting adequate pressure and temperature conditions.

Original languageEnglish
Pages (from-to)96-106
Number of pages11
JournalHigh Pressure Research
Issue number1
Publication statusPublished - 2020 Jan 2


  • Nano-polycrystalline diamond
  • glassy carbon
  • grain size of NPD
  • multianvil apparatus
  • ultrahigh pressure synthesis


Dive into the research topics of 'Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa'. Together they form a unique fingerprint.

Cite this