Dielektrické vlastnosti feroelektrických kapalných krystalů v konečných vzorcích a blízko přechodu do hexatických fází

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Dielectric properties of ferroelectric liquid crystals in finite samples and near the transition to the hexatic phases

Popis výsledku v původním jazyce

The helicoidal and twisted structures of ferroelectric liquid crystals in finite planar samples are described on the basis of free energy and considering the surface anchoring. Their dynamic dielectric response is calculated and compared with experimental results. The comparison yields the depolarization factors connected with the screening of the free charges. In the second part the phase transitions to the ferro and antiferroelectric hexatic phases are described taking into account coupling of bond orientational order (BOO) and tilt of molecules in the smectic layers. Dynamic dielectric response in the vicinity of this transition is contributed by 3 coupled amplitudons and 3 coupled phasons of polarization, molecular tilt and BOO, the strongest beingthe BOO and tilt phasons. The model gives partial softening of BOO phason near the transition. The results are in a good accordance with experimental data.

Název v anglickém jazyce

Dielectric properties of ferroelectric liquid crystals in finite samples and near the transition to the hexatic phases

Popis výsledku anglicky

The helicoidal and twisted structures of ferroelectric liquid crystals in finite planar samples are described on the basis of free energy and considering the surface anchoring. Their dynamic dielectric response is calculated and compared with experimental results. The comparison yields the depolarization factors connected with the screening of the free charges. In the second part the phase transitions to the ferro and antiferroelectric hexatic phases are described taking into account coupling of bond orientational order (BOO) and tilt of molecules in the smectic layers. Dynamic dielectric response in the vicinity of this transition is contributed by 3 coupled amplitudons and 3 coupled phasons of polarization, molecular tilt and BOO, the strongest beingthe BOO and tilt phasons. The model gives partial softening of BOO phason near the transition. The results are in a good accordance with experimental data.

Druh

C - Kapitola v odborné knize

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2003

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název knihy nebo sborníku

Relaxation Phenomena

ISBN

3-540-44269-3

Počet stran výsledku

24

Strana od-do

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Počet stran knihy

750

Název nakladatele

Springer

Místo vydání

Berlin

Kód UT WoS kapitoly

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