Varlous Types of Layer Structures Observed In the B7 Phase of a Bent-shaped Liquid Crystal MHOBOW

Abstract

In the B7 phase of the racemate of MHOBOW, a lot of textures are observed. In this paper, the various types of local layer structures in the B7 phase were investigated using X-ray microbeam. In the gold-yellow-colored circular domains of 4-5 μm-thick cells, the layer apart from the circle center forms monotilted structure with ω〜15°, and ω decreases and the observed rocking curves were very broad as the irradiated position approaches to the center. In so-called banana-leaf domains, severaf periodic sharp peaks were observed, suggsting that the layer was kinked several times along the substrate normal. Furthermore, it was found that the diffraction peaks corresponding to lhe different layer spacings as observed in the powder X-ray diffraction was detected at the different chevron angle peak positions of the same irradiated position.