Abstract
IT has been said that the degree of graphitization of carbon depends chiefly on the highest temperature of heat treatment and that other conditions of heat treatment, such as holding time, are of secondary importance. However, it was previously reported1that the vacuum-evaporated carbon was scarcely graphitized in vacuum, although it was easily graphitized under atmospheric pressure. Therefore, we thought it necessary to study the effect of the gas phase of heat treatment on the graphitization of carbon. In order to investigate this effect, a calcined petroleum coke was heat-treated under various pressures and its lattice constant c0was measured by means of X-ray diffraction method using extra-pure silicon powder as an inner standard.
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References
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NODA, T., INAGAKI, M. Heat Treatment of Carbon under Various Pressures. Nature 196, 772 (1962). https://doi.org/10.1038/196772a0
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DOI: https://doi.org/10.1038/196772a0
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