Suppression of Spontaneous Nucleation and Seeded Growth of Diamond

  1. Murli H. Manghnani and
  2. Yasuhiko Syono
  1. Masao Wakatsuki and
  2. Kaoru J. Takano

Published Online: 21 MAR 2013

DOI: 10.1029/GM039p0203

High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto

High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto

How to Cite

Wakatsuki, M. and Takano, K. J. (1987) Suppression of Spontaneous Nucleation and Seeded Growth of Diamond, in High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto (eds M. H. Manghnani and Y. Syono), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM039p0203

Author Information

  1. Institute of Materials Science, the University of Tsukuba, Sakura-Mura, Ibaraki-Ken 305, Japan

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1987

ISBN Information

Print ISBN: 9780875900667

Online ISBN: 9781118664124

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Keywords:

  • Mineralogy and Crystal Chemistry;
  • Phase transformations;
  • High Pressure-High Temperature Research

Summary

In the flux method of growing diamonds from graphite, the spontaneous nucleation of the diamond is suppressed, if graphite particles are regrown and cover the surface of the starting graphite prior to the diamond nucleation. The minimum pressure necessary for diamond formation from the regrowth-treated graphite (P*) is higher than that from fresh graphite (P 0), by 0.19 GPa at 1350°C with an alloy of Fe-Ni-Co employed as the flux. As an application of this suppressive effect, a seed crystal of diamond, located between the graphite and the flux, can be grown epitaxially by a two-stage pressure cycle. The first stage of the cycle is at a pressure lower than P 0 allowing the regrowth of graphite. The second stage is for the growth of the seed to occur at a sustained elevated pressure level. Crystals up to 2 mm in diameter have been grown.