Abstract
WHEN hot-worked at temperatures above 2,500° C, pyrolytic graphite is transformed into a material with characteristics which approach those of single crystals of natural graphite. For example, the density is greater than 2.2 g/cm3 (compared with an X-ray density of 2.26), while the two coefficients of thermal expansion are identical to those of single crystals. Such a material has been made for the Centre d'Etudes Nucléaires de Saclay (France) by Carbone Lorraine. It has a high lustre and cleaves extremely easily along the basal plane albeit with a certain amount of corrugation (see Fig. 1). Transmission electron microscopy shows that many areas extending over 1000 Å along the a-axis are free of tilt boundaries. The concentration of dislocations is very variable but it appears to be somewhat greater overall than that of natural graphite.
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Baker, C., and Kelly, A., Phil. Mag., 9, 927 (1964).
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JENKINS, G., JOUQUET, G. Shear Compliance of Hot-worked Pyrolytic Graphite. Nature 212, 1567 (1966). https://doi.org/10.1038/2121567a0
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DOI: https://doi.org/10.1038/2121567a0
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