Mode of layer displacements in MX2-type crystals |
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Authors: | M.A. Wahab G.C. Trigunayat |
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Affiliation: | Department of Physics and Astrophysics, University of Delhi, Delhi-110 007, India |
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Abstract: | Using van der Waals potential, the relative strengths of interlayer and intralayer bonds have been estimated in the halides of cadmium and lead. The results have been compared with the recent Raman studies of rigid layer modes in MX2-type layer compounds and X-ray diffraction studies of fused cadmium iodide. It is found that the interlayer bond is relatively much weaker than the intralayer bond. Accordingly, it is concluded that in the polytypic MX2-type compounds CdI2, CdBr2 and PbI2, only X-X glide takes place in the polytypic transformations observed during crystal growth and during high temperature treatment of the polytypes. The nature of the X-X glide has been examined in detail. |
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