Dielectric spectroscopy of the SmQ* phase

0369921 - FZÚ 2012 RIV GB eng J - Journal Article
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. E-ISSN 1029-0338
R&D Projects: GA AV ČR IAA100100911; GA MŠMT MEB050828; GA AV ČR(CZ) GA202/09/0047; GA ČR(CZ) GAP204/11/0723
Grant - others:RFASI(RU) No 02.740.11.5166
Institutional research plan: CEZ:AV0Z10100520
Keywords : chiral liquid crystal * dielectric spectroscopy * antiferroelectric phase * smectic Q phase * elaxation mode
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.006, year: 2011
http://www.tandfonline.com/doi/abs/10.1080/01411594.2011.580432

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.
Permanent Link: http://hdl.handle.net/11104/0203869