Influence of Bias on Dielectric Properties of Mesophases of a Laterally Fluorinated Antiferroelectric Liquid Crystal

Dey, K.; Mandal, Pradip; Dąbrowski, R.

doi:10.1007/978-3-319-44890-9_43

Cited by 2 publications

(3 citation statements)

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“…The strong enough bias field can suppress the Goldstone mode and then relaxation processes like domain mode or soft mode can be revealed. , The soft mode is strongly dependent on temperature while the bias voltage does not have influence on the relaxation frequency of this dielectric process. Usually, the soft mode is observed near to the SmC*–SmA* phase transition but there are also compounds with the soft mode registered in the whole temperature range of the ferroelectric SmC* phase and even in the antiferroelectric SmC* A phase . There are possible three dielectric processes in the antiferroelectric SmC* A denoted here as P H , P L (so-called the antiferroelectric-like Goldstone mode), and molecular s-process that was reported earlier by us and others. − …”

Section: Results and Discussionmentioning

confidence: 81%

“…Usually, the soft mode is observed near to the SmC*–SmA* phase transition but there are also compounds with the soft mode registered in the whole temperature range of the ferroelectric SmC* phase and even in the antiferroelectric SmC* A phase . There are possible three dielectric processes in the antiferroelectric SmC* A denoted here as P H , P L (so-called the antiferroelectric-like Goldstone mode), and molecular s-process that was reported earlier by us and others. − …”

Section: Results and Discussionmentioning

confidence: 81%

“…Usually, the soft mode is observed near to the SmC*− SmA* phase transition but there are also compounds with the soft mode registered in the whole temperature range of the ferroelectric SmC* phase and even in the antiferroelectric SmC* A phase. 80 There are possible three dielectric processes in the antiferroelectric SmC* A denoted here as P H , P L (so-called the antiferroelectric-like Goldstone mode), and molecular sprocess that was reported earlier by us and others. 80−83 Figure 16 presents the dielectric absorption as a function of frequency and temperature for pure AFLC mixture and both composites in the antiferroelectric SmC* A phase registered without (left column) and with (right column) applied bias field.…”

Section: P Wp W P (1mentioning

confidence: 88%

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Modification of AFLC Physical Properties by Doping with BaTiO₃ Particles

Lalik

Deptuch

et al. 2020

J. Phys. Chem. B

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In this paper, for the first time, the influence of the BaTiO3 particles on the antiferroelectric liquid crystalline phase was shown. Low concentrations and two different sizes of BaTiO3 particles (nano- and submicroparticles) were used. It was found that admixture of the ferroelectric particles causes a decrease in the concentration of free ions in the liquid crystal matrix. Despite the small amount of admixture, a decrease in spontaneous polarization, switching time and rotational viscosity, was observed, while the tilt angle of molecules and the smectic layer thickness did not change. It turns out that BaTiO3 particles have a very large impact on the dielectric spectra not only in the antiferroelectric phase but also in the ferroelectric and paraelectric phases of the polymorphic mixture studied. The dopants affect also the complex conductivity. In this paper, we explain why some properties are modified by BaTiO3 particles and others are not.

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