Thermodynamical, electrical and electro-optical studies of a room temperature tri-component antiferroelectric liquid crystalline material

Autor: Ravindra Dhar, Magdalena Zurowska, Roman Dabrowski, Avneesh Mishra
Rok vydání: 2014
Předmět:
Zdroj: Phase Transitions. 87:746-757
ISSN: 1029-0338
0141-1594
Popis: Thermodynamic and electric studies show the wide room temperature range antiferroelectric SmC*a (91.1 to −20.0 oC) phase in addition to narrow temperature range paraelectric SmA* (∼2.1 oC) and ferroelectric SmC* (∼4.3 oC) phases in thestudied antiferroelectric material. Frequency-dependent dielectric studies show five different relaxation modes appearing in SmA*, SmC* and SmC*a phases under the planar anchoring condition of the molecules. The ferroelectric SmC* to paraelectric SmA* transition temperature has been found to be 97.3 oC using Curie–Weiss law. The dielectric response of SmC*a phase exhibits three relaxation modes in addition to Goldstone mode in SmC* phase and soft mode in SmA* phase. Polarizations, switching time and rotational viscosity have also been determined. Maximum value of polarization (P) is ∼300 nC/cm2. Switching time is the order of few milliseconds.
Databáze: OpenAIRE
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