Nucleation and growth of diamond particles from the vapor phase

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Abstract High-quality diamond particles up to 0.6 mm in diameter were produced by are discharge plasma chemical vapor deposition. An ethanol-methanol-hydrogen gas mixture at pressures ranging between 250 and 400 torr was used as a reactant gas. The particles were formed by spontaneous nucleation on a molybdenum substrate and grown within a few hours at substrate temperatures as high as 1300 °C. Growth rates in the range 0.1–0.3 mm/h were common. Three experimental techniques aimed at reducing the number of spontaneously formed diamond nuclei were attempted and found feasible. Nuclei density as low as 10 cm −2 were achieved.

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