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2010 | 117 | 4 | 553-556
Article title

Dielectric Properties of Ferroelectric Liquid Crystals with Diversified Molecular Structure

Content
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Languages of publication
EN
Abstracts
EN
Mesomorphic, thermodynamic, electro-optic and dielectric properties of three homologues of fluorosubstituted esters are described. Full chemical names of these compounds are as follows: (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-penta-fluoro-propano-ynloxyhex-1-oxy)-biphenyl-4-yl (in short 2F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-nona-fluoro-pentano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 4F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-trideca-fluoro-heptano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 6F6BBiOC8). The compounds exhibit ferroelectric smectic C* phase between crystalline and isotropic phase. Only one compound (6F6BBiOC8) shows antiferroelectric phase (SmC*_{A}) observed by dielectric spectroscopy, but the range of this phase is narrow of about 2°. All three compounds exhibit in the SmC* phase Goldstone mode and Maxwell-Wagner relaxation hidden in the conductivity contribution at low frequencies, whereas in the SmC* _{A} phase two anti-ferroelectric modes (AFM1) and (AFM2) contribute to the dielectric spectrum. The compounds were studied using differential scanning calorimetric, frequency domain dielectric spectroscopy, and reversal currents method to determine spontaneous polarization.
Keywords
EN
Year
Volume
117
Issue
4
Pages
553-556
Physical description
Dates
published
2010-04
References
  • 1. R. Dąbrowski, Ferroelectrics 243, 1 (2000)
  • 2. A. Mikułko, M. Marzec, S. Wróbel, R. Dąbrowski, Opto-Electron. Rev. 14, 319 (2006)
  • 3. M. Marzec, A. Mikułko, S. Wróbel, A. Szymańska, R. Dąbrowski, Mol. Cryst. Liq. Cryst. 480, 140 (2008)
  • 4. A. Mikułko, M. Marzec, M.D. Ossowska-Chruściel, J. Chruściel, S. Wróbel, Ferroelectrics 343, 209 (2006)
  • 5. S. Wróbel, W. Haase, A. Fąfara, M. Marzec, in: Relaxation Phenomena, Liquid Crystals, Magnetic Systems, Polymers, High-T$_c$ Superconductors, Metallic Glasses Eds. S. Wróbel, W. Haase, Springer-Verlag, Heidelberg 2003, Ch. 5.11
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv117n405kz
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