Activation energies for crystallite growth and ordering in graphistising carbons. I. Crystallite growth

  • Richards B
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Abstract

The activation energy for crystallite growth in a variety of graphitising carbons has been investigated using X-ray diffraction techniques. The values Eaand Ecfor crystallite growth in the a-direction and c-direction respectively are essentially single values ({reversed tilde}300 and {reversed tilde}210 kcal mole-1respectively) and are the same for all the materials examined, and are independent of the extent of the transformation of carbon towards the graphite structure. These values imply that in the absence of other restraints, crystallite growth is potentially easiest in the c-direction. In the temperature range 2000-3000°C the activation energy for crystallite growth, especially in the a-direction, is different from that for the "ordering of the stacking sequence", i.e. crystallite growth is essentially independent of three-dimensional ordering. The results are discussed in terms of a mosaic model of graphitisation and it is suggested that the processes of crystallite growth are controlled by interstitial migration mechanisms. © 1976.

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  • B. P. Richards

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