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- W2035560308 abstract "Unusual modes for mass density fluctuations are observed by X-ray experiments in nematic and smectic phases of some liquid crystalline materials with cyano end group. In particular, for the first time, we give evidence for a S A-SA transition in a pure compound (DB7) : in the high temperature SA1 phase a long-range density wave with a wavelength equal to 1.6 molecular length coexists with a short-range wavelength of about one molecular length. At low temperature a transition towards an SA2 phase occurs and we see two sharp Bragg spots which correspond to the two first-orders of diffraction by a modulation of two molecular length periodicity. Further another cyano derivative which exhibits both reentrant nematic and reentrant smectic A phases reveals the simultaneous existence and the competition of two modulations in these phases. But the occurrence of a reentrant phase does not seem to be connected to a commensurate or incommensurate lock-in of the two characteristic wavelengths." @default.
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- W2035560308 date "1981-01-01" @default.
- W2035560308 modified "2023-10-16" @default.
- W2035560308 title "Anomalies of periodicity in some liquid crystalline cyano derivatives" @default.
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- W2035560308 doi "https://doi.org/10.1051/jphys:0198100420107100" @default.
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