Solid-state phase transformations have been observed to occur in polytypic crystals of cadmium iodide, grown from solution, upon cooling them down to — 175 °C. In addition, structural changes with respect to streaking, arcing, and diffuseness of diffraction spots and the background intensity on the x-ray photographs have been observed. The results have been interpreted on the basis of movement of unit and partial edge dislocations generated during crystal growth. The movement of dislocations is possibly caused by internal strains produced upon cooling.
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Arora, R.M., Trigunayat, G.C. Phase transformations at −175 °C in polytypic crystals of cadmium iodide. J Low Temp Phys 23, 231–239 (1976). https://doi.org/10.1007/BF00117253
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DOI: https://doi.org/10.1007/BF00117253