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A transition between a smectic A phase and a smectic A antiphase (S Ã) is observed for the first time in a pure compound : the nitrobenzoyloxybenzoate of heptylphenyl. So far, the anomalies of periodicities which are connected to this type of transition were only detected in cyano systems. Moreover, the solid phase of the inferior homologue of this nitro series is surprisingly influenced by similar anomalies of periodicities.
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Hardouin et al. (1981) studied this question.
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