ON THE SHAPE OF PROFILES OF (00l) DIFFRACTION LINES OF GRAPHITE AND CARBONS

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Abstract
The shape of the (00l) diffraction profiles of natural graphite and polyvinylchloride cokes (PV-7) heat-treated at various temperatures was investigated. In order to reduce the effect of X-ray absorption by the sample, the thickness of the specimen for X-ray diffraction was limited to 0.2mm. The observed diffracted intensity was corrected for Lorentzpolarization, atomic scattering and absorption factors by a conventional method. The observed profile of (002), (004), (006) and (008) diffraction lines of natural graphite was symmetrical. The profile of (002) and (004) diffraction lines of PV-7 heat-treated at various temperatures in the flow of nitrogen was also symmetrical, and it was concluded that each of these carbons consists of only one component having one kind of mean interlayer spacing. The carbons (PV-7) heattreated at relatively low temperature under 3 and 5 kbar had symmetrical profiles of (00l) diffraction lines. At higher temperature of heat treatment, however, the heat-treated carbons had composite profiles. These composite profiles could be separated into two symmetrical component profiles which corresponded to the structures having different mean interlayer spacings.

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