Abstract
Both wide angle and low angle X-ray diffraction patterns have been measured for a sample of vitreous carbon which has been subjected to a maximum heat-treatment of 1800°C. The wide angle scattering was used to calculate a radial distribution function, which showed that the basic atomic arrangement was that of hexagonal graphite like sheets with no graphitic registration between the sheets. The low angle scattering pattern was interpreted in terms of a theory due to Debye, and an exponential correlation function was found to be a reasonable approximation for representing the electron density fluctuations giving rise to this scattering. The electron density fluctuations originate from pores in the matrix with a mean chord intercept length of ⋍ 8 Å. The mean chord intercept for the matrix is ⋍ 16 Å in reasonable agreement with “crystallite sizes” L c ⋍ 15 A ̊ and L a⋍ 22 A ̊ , calculated from the Scherrer equation. L c should be interpreted as a distance between pores, and L a as a defect distance in the matrix rather than indicating sharp crystallite boundaries.
Published Version
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