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Structure of the smectic D phase |
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| Authors: | G Etherington A J Leadbetter X J Wang G W Gray A Tajbakhsh |
| Institution: | 1. Rutherford Appleton Laboratory , Chilton, Didcot, Oxon, OX 11 OXQ, England;2. Rutherford Appleton Laboratory , Chilton, Didcot, Oxon, OX 11 OXQ, England;3. Physics Department , Tsinghua University , Beijing, Peoples Republic of China;4. Department of Chemistry , Hull University , Cottingham Road, Hull, HU6 7RX, England |
| Abstract: | Abstract The so-called ‘smectic’ D phase of 4′-n-octadecyloxy-3′-cyanobiphenyl-4-carboxylic acid (one of only four materials known to exhibit this phase) has been shown unambiguously by X-ray diffraction to be characterized by a primitive cubic space group. The space group is either P23 or Pm3, and the lattice parameter a 0 is 86 Å. It is shown that data from previous studies of this phase may be re-intepreted to be consistent with these findings. In view of these conclusions it is clearly inappropriate to refer to the phase as smectic. |
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