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2 Opto-Electronics Review

2 2008

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Dielectric measurements of new antiferroelectric liquid crystals

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Perkowski P. , Ogrodnik K. , Łada D. , Piecek W. , Rutkowska J. , Raszewski Z. , Żurowska M. , Dąbrowski R. , Sun X.

tom Vol. 16, No. 3

277-280

Three new pure antiferroelectric materials, synthesized at the Military University of Technology (MUT), were investigated by dielectric means. Clear relaxation modes were detected, i.e., Soft, Goldstone, low frequency in-phase (PL) as well high frequency anti-phase (PH) modes for paraelectric Sm A* phase, ferroelectric Sm C* phase and antiferroelectric Sm CA* phase, respectively. Additionally, a high relaxation mode in Sm CA* was found. The relaxation frequencies fR of the observed modes were calculated from Cole-Cole diagrams.

Technical aspects of dielectric spectroscopy measurements of liquid crystals

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Perkowski P. , Łada D. , Ogrodnik K. , Rutkowska J. , Piecek W. , Raszewski Z.

tom Vol. 16, No. 3

271-276

The dielectric spectroscopy measurements were performed for antiferroelectric liquid crystalline mixture. For this purpose, the cells with ITO electrodes were prepared. It was found that it is not possible to detect some important relaxation modes in Sm A*, Sm C*, and Sm CA* phases. The own cell mode (related to cell properties, i.e., capacity and resistivity) covers the dielectric response of liquid crystalline medium. Dielectric measurements in cells with gold electrodes were done to show all possible relaxations in antiferroelectric liquid crystals (Lcs).