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27 June 2002 Anomalous behaviour of antiferroelectric SmCα* phase
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Proceedings Volume 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications; (2002)
Event: XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, 2001, Zakopane, Poland
New liquid crystalline substance has been studied by means of frequency domain dielectric spectroscopy (FDDS) and electro-optic methods. Typical soft mode is visible in paraelectric SmA* phase. Temperature dependencies of dielectric increment and critical frequencies in SmCsub* are more complicated what suggests existing of SmC(alpha )* phase. There is no evidence of the Goldstone mode in the monotropic SmC(alpha )* phase what supports the idea of its antiferroelectric nature. It is confirmed by measurements of spontaneous polarization by the reversal current method. Two peaks appear on the opposite sides of the zero field. The temperature dependence of spontaneous polarization as well as FDDS measurements show that transition between the SmC(alpha )* and paraelectric SmA* phases seems to be a first order transition.
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A. Fafara, S. Wrobel, Wolfgang Haase, M. Marzec, and Roman S. Dabrowski "Anomalous behaviour of antiferroelectric SmCα* phase", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002);

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