CHARACTERIZATION OF THE HEXATIC B AND CRYSTAL B PHASES BY OPTICAL MICROSCOPY.

Article abstract of DOI:10.1080/00268948108073618

Recent investigations concerning the structure of the B phase have unearthed a variety of packing arrangements of the molecular layers for this smectic modification. Two general structures have been discovered; one in which the B phase has three-dimensional crystalline order (crystal B), and one that is characterized by short-range in-plane positional ordering of the constituent molecules, and long-range bond orientational order, both within and between the layers (hexatic B). In this present study n-hexyl 4 prime -n-pentyloxybiphenyl-4-carboxylate (650BC) has been synthesized and its smectic phases characterized. Typically, this ester exhibits an A,B,E phase sequence, with the B phase being of the hexatic type. The synthesis, microscopic textures, and miscibility studies are reported here. The results show that while the two types of B phase appear co-miscible by conventional optical methods, in fact X-ray diffraction studies show that a transition occurs between the two phases in certain binary mixtures. Thus, the hexatic B and crystal B modifications are thermodynamically distinct phases.

Full text of DOI:10.1080/00268948108073618

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Molecular Crystals and Liquid
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Characterization of the
Hexatic B and Crystal B
phases by Optical Microscopy
a
a
J. W. Goodby & R. Pindak
a
Bell Laboraories, Murray Hill, New Jersey,
7974, U.S.A.
0
Published online: 14 Oct 2011.
To cite this article: J. W. Goodby & R. Pindak (1981): Characterization of the
Hexatic B and Crystal B phases by Optical Microscopy, Molecular Crystals and
Liquid Crystals, 75:1, 233-247
To link to this article: http://dx.doi.org/10.1080/00268948108073618
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