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Phase transitions of the nematic liquid crystal p-methoxy-benzylidine, p-n butyl-aniline were studied by recording the low-frequency Raman spectrum. The intensity of the lattice Raman bands undergoes abrupt change at the crystalline-to-nematic phase transition temperature, with an indication of a hysteresis. The band totally disappears at the isotropic (liquid) phase.
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Borer et al. (1971) studied this question.
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