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Verhandlungen pp 455-459 | Cite as

The diamond to graphite transformation

Abstract

When diamond is heated in vacuum to temperatures above about 1200° C, an allotropic transformation to graphite occurs. This change has been studied using two types of sample — fine diamond powder, and large single crystals of diamond. The graphitised diamond powder has been examined by transmission electron microscopy and diffraction; the graphitised single crystals by reflection electron microscopy and diffraction. It was found that the graphite forms as crystallites about 100 A across; that plastic deformation of the diamond can occur at 1800° C under the stresses set up by an expanding nucleus of graphitisation; and that the presence or absence of preferred orientation of the graphite on the diamond depends on the temperature of graphitisation.

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References

  1. 1.
    Courtney-Pratt, J. S., J. W. Menter and M. Seal: Proc. III. Int. Conf. Electron Microscopy, London 1954, 645 (1956).Google Scholar
  2. 2.
    Piinney, F. S.: Science 120, 393 (1954).ADSCrossRefGoogle Scholar
  3. 3.
    Grenville-Wells, H. J.: Mineral. Mag. 29, 803 (1952).CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1960

Authors and Affiliations

  • M. Seal
    • 1
  1. 1.Research Laboratory for the Physics and Chemistry of Solids, Department of PhysicsUniversity of CambridgeEngland

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