• The dynamic X-ray reflections in carbon silicide

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    • Keywords


      Elastic Vibration; Carborundum; Thermal Theory; Laue Pattern; Laue Spot

    • Abstract


      Raman’s theory of dynamical X-ray reflections and the thermal theory of diffuse X-ray scattering are critically reviewed. An investigation of the extra-spots in X-ray diffraction by the {2021} planes of a hexagonal type of carborundum crystal shows that the spots are sharp and their intensity is nearly independent of temperature for a wide range from −180°C. to 600°C. and for different orientations of the crystal. It has been shown that they can be explained as due to the coherent modified reflections of X-rays by the eigen-vibrations of the crystal lattice having a frequency of 830 cm.−1 which is observed in the infra-red absorption as well and that the diffuse thermal scattering due to the long eleastic waves is not responsible for their appearance.

    • Author Affiliations


      C S Venkateswaran1 2

      1. Department of Physics, Indian Institute of Science, Bangalore
      2. University College, Trivandrum
    • Dates


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