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• W2024379096 abstract "Using x-ray and optical methods we have probed the structural organization of an antiferroelectric twist grain boundary phase (TGBC(a)) lying between the regular antiferroelectric smectic-C (SmC(a)* and the smectic-Q (SmQ) or isotropic phase. We find that the twist axis is everywhere perpendicular to the local smectic layer normal and that the helical superstructure is incommensurate with the smectic layer structure. The twist grain boundaries consist of a periodic lattice of alternating +1/2 and -1/2 dispirations, i.e., unit screw dislocations in combination with half unit disclinations. The molecular tilt plane is alternatingly parallel and perpendicular to the twist axis. We find that the optically measured tilt angle in the SmC(a)* phase is smaller than that measured by x rays, which is the opposite to what is found in the SmC* phase. This means that the core part tilts less than the end chains in the SmC(a)* phase, while it tilts more in the SmC* phase. On entering the TGB phase a clear decrease is measured in the tilt angle. This is explained by the elastic influence from the disclinations, which appear in this phase." @default.
• W2024379096 created "2016-06-24" @default.
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• W2024379096 date "2007-07-13" @default.
• W2024379096 modified "2023-09-25" @default.
• W2024379096 title "Possible model of an antiferroelectric twist grain boundary phase" @default.
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• W2024379096 doi "https://doi.org/10.1103/physreve.76.011704" @default.
• W2024379096 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17677468" @default.
• W2024379096 hasPublicationYear "2007" @default.
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