Schlieren texture has been observed in Sc and SCA liquid-crystalline phases. We found that defects of strength s=± 1/2 exist in the SCA phase in addition to those of s=± 1 observed in the Sc phase. The existence of the s=± 1/2 wedge disclination is explained by taking account of a screw dislocation. This complex defect consisting of a wedge disclination and a screw dislocation, i. e. a dispiration, serves as a simple test to confirm the antiferroelectric (SCA) structure.
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Takanishi et al. (1992) studied this question.
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