Počet záznamů: 1

Dielectric spectroscopy of the SmQ* phase

  1. 1.
    0369921 - FZU-D 2012 RIV GB eng J - Článek v odborném periodiku
    Perkowski, P. - Bubnov, Alexej - Piecek, W. - Ogrodnik, K. - Hamplová, Věra - Kašpar, Miroslav
    Dielectric spectroscopy of the SmQ* phase.
    Phase Transitions. Roč. 84, 11-12 (2011), s. 1098-1107 ISSN 0141-1594
    Grant CEP: GA AV ČR IAA100100911; GA MŠk MEB050828; GA AV ČR(CZ) GA202/09/0047; GA ČR(CZ) GAP204/11/0723
    Grant ostatní:RFASI(RU) No 02.740.11.5166
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: chiral liquid crystal * dielectric spectroscopy * antiferroelectric phase * smectic Q phase * elaxation mode
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 1.006, rok: 2011

    Liquid crystalline (LC) material possessing two biphenyl moieties in the molecular core and lateral chlorine substitution far from the chiral chain has been studied by the broadband dielectric spectroscopy within frequency range 100 Hz-2 MHz. On cooling from the isotropic phase, the material possesses the frustrated smectic Q* (SmQ*) and the antiferroelectric smectic (SmCA*) phases within a broad temperature range. It has been confirmed by dielectric spectroscopy that the SmQ phase is closely related to SmCA* antiferroelectric phase. Only one relaxation process has been observed in the SmQ* phase, while in the SmCA* phase two relaxation are clearly detectable. It seems that mode found in the SmQ is connected with high frequency anti-phase mode observed in the SmCA* phase; this mode is weaker and faster than that in the SmCA* phase.
    Trvalý link: http://hdl.handle.net/11104/0203869