Abstract
ONE of the more peculiar of the solid-state crystalline phase transformations which occur in nature is that in which a highly ordered crystalline phase is exchanged for one exhibiting a large degree of rotational disorder. In such a transformation some weaker bonds are broken while stronger bonds remain. Parts of a molecule are then free to rotate about the fixed structure. For each of the two phases it is not uncommon to find considerably different values in interfacial tension at the crystal–melt interface. For carbon tetrachloride, one of the many substances exhibiting a rotational disordered phase, this interfacial tension decreases from 13.9 erg/cm2 for the more ordered phase to 6.67 erg/cm2 for the rotationally disordered phase1.
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References
Dunning, W. J., Structure of Surfaces, Physics and Chemistry of the Organic Solid State, I (edit. by Fox, D.), 432, 581 (Interscience Pub., 1963).
Rabinowicz, E., Compatibility Criteria for Sliding Metals, Friction and Lubrication on Metal Processing, 90 (ASME, 1966).
Ubbelohde, A. R., Melting and Crystal Structure, 73 (Clarendon Press, 1965).
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SIMKINS, T. Effect of Rotational Phase Transformations on Dry (Coulomb) Friction. Nature 225, 446–447 (1970). https://doi.org/10.1038/225446a0
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DOI: https://doi.org/10.1038/225446a0
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