Discovery of a novel ferrielectric phase of five-layer periodicity in binary mixtures of chiral smectic liquid crystals exhibiting unusual reversed phase sequence

Chandani, A. D. L.; Fukuda, Atsuo; Kumar, Sandeep; Vij, J. K.

doi:10.1080/02678292.2011.566943

Cited by 28 publications

(24 citation statements)

References 21 publications

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“…2(a) with Fig. 3(b) of the previous paper [10]; we admit that data processing requires us to multiply the ordinate axis of Fig. 3(b) by a factor of 2.…”

Section: Resultsmentioning

confidence: 99%

“…The contours showed characteristic patterns typical of the prototype subphases 1 2 , 1 3 , and Sm-C * α as well as the main phases Sm-C * A , Sm-C * , and Sm-A, although it may not be easy to distinguish between 1 2 and Sm-C * A in some cases. In the binary mixture system under investigation, since RXRS unambiguously showed the emergence of Sm-C * , 1 2 , Sm-C * α , and Sm-A, identifying these by EFIB was easily facilitated in our previous work [10].…”

Section: Methodsmentioning

confidence: 99%

“…It is worthwhile to review some of the parameters here, although limited experimental studies were carried out so far. The previous EFIB measurements were performed in two mixtures containing 11.05 and 11.48 wt.% of C11 in 10OHF [10]. A ferrielectric phase identified as 3 5 was undoubtedly shown to emerge in a temperature range as wide as 2…”

Section: Methodsmentioning

confidence: 99%

“…As in [10], a bipolar square-wave field is used to avoid any charge accumulation on an electrode and a frequency of 10 Hz is empirically chosen so that the optimum collection of EFIB signals can be performed [6,39].…”

Section: Methodsmentioning

confidence: 99%

“…) and Sm-C * A ( 1 2 detailed investigations were performed in our previous paper [10], we carefully study EFIB in the same nOHFBBB1M7 (n = 10) (10OHF) mixture system of several nOTBBB1M7 (n = 11) (C11) concentrations and draw E-T phase diagrams with contours of constant birefringence for each of the concentrations studied. The results will be presented and discussed in terms of Dolganov's phenomenological Landau model of the phase transitions.…”

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confidence: 99%

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Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model

et al. 2013

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We draw several electric-field-temperature (E-T ) phase diagrams with electric-field-induced birefringence contours in the nOHFBBB1M7 (n = 10) and nOTBBB1M7 (n = 11) (C11) mixture system by changing the C11 concentration carefully; some of the mixtures show the unusual extraordinary phase sequence where subphases with the four-, five-, and six-layer superlattice structures emerge above the smectic-C * main phase. We try to understand the results in terms of two complementary models that have so far been proposed: the phenomenological Landau model of phase transitions by Dolganov et al. (2003)]. The observed E-T phase diagram can be well reproduced by the phenomenological model. An emergence of the subphase with the four-layer superlattice structure above smectic-C * is also understandable in terms of the partially molecular model. We discuss the pros and cons of the two models as well.

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“…2(a) with Fig. 3(b) of the previous paper [10]; we admit that data processing requires us to multiply the ordinate axis of Fig. 3(b) by a factor of 2.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model

et al. 2013

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Antiferroelectric Liquid Crystal Displays and Their Materials

Yamada

Fukuda

2014

Handbook of Liquid Crystals

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Dielectric and Electro‐Optical Properties of Antiferroelectric Liquid Crystalline Materials

Pandey¹,

Verma

Dhar

2012

Israel Journal of Chemistry

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are the isotropic, chiral nematic, orthogonal smectic (paraelectric), incommensurate tilted smectic with modulation of three to nine smectic layers, ferroelectric, antiferroelectric with unit of four smectic layers, ferrielectric with unit of three smectic layers, antiferroelectric with unit of two smectic layers and hexatic phases, respectively. In these phases, the molecules within each layer are oriented with their long axis along a common direction [a] M. B. Pandey Physics Department Abstract: Antiferroelectric liquid crystals (AFLCs) are a recent class of materials in the family of liquid crystals which have high prospect of application in displays with better results as compared to conventional nematic displays. Beside technological applications, AFLCs are very interesting from the point of view of basic studies in soft condensed matter systems as these materials are showing vari-ous new sub-phases, viz. SmC a * , SmC b *, SmC g * and many others with distinct macroscopic properties in a narrow temperature region in addition to the most common wide-range low-temperature SmC a * phase. In the present article, we report the structure of various sub-phases of AFLCs, their dielectric behaviour and the electro-optical response of some of the materials studied by our group.

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Discovery of a novel ferrielectric phase of five-layer periodicity in binary mixtures of chiral smectic liquid crystals exhibiting unusual reversed phase sequence

Cited by 28 publications

References 21 publications

Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model

Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model

Antiferroelectric Liquid Crystal Displays and Their Materials

Dielectric and Electro‐Optical Properties of Antiferroelectric Liquid Crystalline Materials

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