Field-Induced Transitions Between Antiferroelectric and Ferrielectric Phases

Gleeson, Helen F.; Jaradat, S.; Labeeb, Ahmad M.; Osipov, Mikhail A.

doi:10.1080/00150193.2012.684619

Cited by 10 publications

(13 citation statements)

References 9 publications

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“…Recently, the new 3-layer periodicity phase under the electric field between the SmC * γ and SmC * phases was proposed [33][34][35]37]. However, it is not sure whether the new 3-layer periodicity phase affected the present results within our experimental conditions, because the RXS 1/3-order peak position does not depend on those configuration models.…”

contrasting

confidence: 46%

“…Investigating the transitional subphases and their molecular arrangements in other LC materials under the electric field can clarify the underlying mechanisms of the phase transition process. In this paper, the electric field-induced phase transitions at several temperatures are studied using the RXS technique for the Se-containing chiral smectic LC, which is a typical LC for RXS measurements [11,13,32,34,35]. We observe new field-induced transitional subphases and the successive change of the layer periodicity.…”

Section: Introductionmentioning

confidence: 99%

“…Recent RXS studies under an electric field directly revealed the electric field-induced phase transitions from the low field AF phase to the high field SmC * γ phases [33][34][35]. In these experiments, the planer aligned cell structure (device geometry) was adopted to apply a sufficiently high electric field, while most of the RXS experiments were performed using self-standing films [10][11][12][13][14][15]22].…”

Section: Introductionmentioning

confidence: 99%

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Transitional subphases near the electric-field-induced phase transition to the ferroelectric phase in Se-containing chiral smectic liquid crystals observed by resonant x-ray scattering

et al. 2016

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Resonant X-ray scattering experiments revealed new transitional subphases near the electric field-induced phase transition of a Se-containing chiral liquid crystal in a planar aligned cell geometry. In the lower temperature range (SmC * A and 3-layer periodicity SmC * γ phases), the 6-layer periodicity subphase appeared with increasing electric field during the field-induced transition from SmC * γ to SmC * . In the higher temperature range (4-layer periodicity AF phase), the peak positions of the 3-layer satellites shifted to those of the 4-layer satellites and then the satellites corresponding to the 5-through 7-layer periodicity appeared in sequence. Near the AF to SmC * α phase transition temperature, the layer periodicity increased with applied field. The molecular configurations of the subphases near the field-induced transition are discussed based on the Ising, distorted clock, and perfect clock models.

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contrasting

confidence: 46%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transitional subphases near the electric-field-induced phase transition to the ferroelectric phase in Se-containing chiral smectic liquid crystals observed by resonant x-ray scattering

et al. 2016

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“…4 The reason for choosing this particular FLC system are the widely available data in the literature. 4,[14][15][16][17][18] The chiral dopant increases the SmC a * temperature range from 1 C to 3 C while reducing almost all of the phase transition temperatures of the neat KC983 material, leading to a phase transition sequence of Iso 94.2 SmA 79.1 SmC a * 76.1 SmC* 74.7 SmC FI2 * 67.4 SmC FI1 * 59.3 SmC A * 33 Cr (on cooling). 2,4 Two diacrylate monomers were tested: the first monomer was 1,6-hexanediol diacrylate (here termed aliphatic diacrylate, Sigma-Aldrich, USA).…”

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confidence: 99%

Polymer stabilization of the smectic C-alpha* liquid crystal phase—Over tenfold thermal stabilization by confining networks of photo-polymerized reactive mesogens

Labeeb

Gleeson

Hegmann

2015

Applied Physics Letters

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The smectic C*-alpha (SmC a *) phase is one of the sub-phases of ferroelectric liquid crystals that has drawn much interest due to its electro-optical properties and ultrafast switching. Generally observed above the ferroelectric SmC* phase in temperature, the SmC a * commonly shows only very narrow phase temperature range of a few degree Celsius. To broaden the SmC a * phase, polymer stabilization was investigated for thermal phase stabilization. Two different reactive monomers were tested in three mixtures, and all three broadened the temperature range of the SmC a * phase from 3 C to 39 C. The current reversal method was used to determine the phase existence versus temperature. Moreover, the texture and network structure was studied by polarized optical microscopy and scanning electron microscopy, with the latter revealing the confinement of the smectic layer structure within the porous polymer network. V C 2015 AIP Publishing LLC.

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“…Not only the temperature-induced phase transition but also an electric-field-induced phase transition in these chiral smectic LCs from low-field subphases to the high-field SmC * phase has been extensively studied [1,[20][21][22][23][24][25]. Among them, RXS studies have directly revealed a sequential field-induced phase transition from the AF phase at low field, the SmC * γ phase at medium field, and the SmC * phase at high field using samples with a device geometry (planar aligned cell structure) [26][27][28]. Recently, in a Br-containing chiral LC, a field-induced transitional subphase with twelve-layer periodicity was found between the SmC * γ phase and the SmC * phase by microbeam RXS analysis with the device geometry [29].…”

Section: Introductionmentioning

confidence: 99%

Resonant x-ray scattering observation of transitional subphases during the electric-field-induced phase transition in a mixture of Se-containing chiral smectic liquid crystals

et al. 2018

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Using resonant x-ray scattering techniques, transitional subphases during the electric-field-induced phase transition of a mixture of Se-containing chiral liquid crystals, 80% AS657 and 20% AS620, in a planar-aligned cell geometry were investigated, where the prototypical phase sequence SmC_{A}^{*}-SmC_{γ}^{*}-AF-SmC^{*} was observed; the transitional subphases were formed during the transition from the three-layer periodicity phase to the ferroelectric phase. In the lower-temperature range where the three-layer SmCγ^{*} phase appeared under the low electric field, nine- and six-layer subphases and a "streak" pattern appeared in sequence after the transition from the SmCγ^{*} phase with increasing applied electric field; the ferroelectric phase was realized. In the higher-temperature range where the four-layer AF phase appeared under a low electric field, the AF phase changed to a three-layer phase at the medium electric field. The twelve-, nine-, and six-layer subphases subsequently appeared in sequence, and finally the ferroelectric phase was generated with increasing electric field. The molecular arrangements of the field-induced subphases, especially the newly found nine-layer periodicity phase, was analyzed. The successive field-induced phase transition of the present results was compared with that of our previous results for pure Se-containing and Br-containing liquid crystals, and the relation to the three-layer ferrielectric phase was discussed.

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Field-Induced Transitions Between Antiferroelectric and Ferrielectric Phases

Cited by 10 publications

References 9 publications

Transitional subphases near the electric-field-induced phase transition to the ferroelectric phase in Se-containing chiral smectic liquid crystals observed by resonant x-ray scattering

Transitional subphases near the electric-field-induced phase transition to the ferroelectric phase in Se-containing chiral smectic liquid crystals observed by resonant x-ray scattering

Polymer stabilization of the smectic C-alpha* liquid crystal phase—Over tenfold thermal stabilization by confining networks of photo-polymerized reactive mesogens

Resonant x-ray scattering observation of transitional subphases during the electric-field-induced phase transition in a mixture of Se-containing chiral smectic liquid crystals

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