Low frequency dielectric spectroscopy on mixtures containing ferroelectric liquid crystals

Abstract Dielectric spectroscopy (frequency range 10 −1 Hz to 105 Hz, temperature range 300 K to 370 K) was employed to investigate the Goldstone mode in ferroelectric liquid-crystalline mixtures of chiral and achiral compounds. While the spontaneous polarization decreases with increasing fraction of the achiral molecules the Goldstone mode remains constant in its oscillatory strength. As expected the Goldstone mode frequency shifts to lower values with increasing amount of achiral molecules in the ferroelectric liquid-crystalline mixture.

[1]  J. Parneix,et al.  Dielectric study of a ferroelectric liquid crystal , 1988 .

[2]  P. Martinot-Lagarde,et al.  Dielectric relaxation in a ferroelectric liquid crystal , 1981 .

[3]  F. Kremer,et al.  Broadband dielectric spectroscopy on the molecular dynamics in polymer model-systems: polyphenylmethylsiloxane and linear and star-branched poly(cis-1,4-isoprene) , 1989 .

[4]  L. Blinov,et al.  Pyroelectric properties of liquid crystals , 1981 .

[5]  F. Kremer,et al.  Field dependent soft and goldstone mode in a ferroelectric liquid crystal as studied by dielectric spectroscopy , 1989 .

[6]  Haase,et al.  Dielectric relaxation in the smectic-A and smectic-C phases of a ferroelectric liquid crystal. , 1989, Physical review. A, General physics.

[7]  F. Kremer,et al.  Ferroelectric modes in combined side-group main chain liquid-crystalline polymers , 1989 .

[8]  Kremer,et al.  Constant molecular rotation at the smectic-A to smectic-C* transition in ferroelectric liquid crystals. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[9]  M. Glogarová,et al.  The effect of biasing electric field on the soft mode in the vicinity of the ferroelectric phase transition in liquid crystals , 1989 .

[10]  F. Kremer,et al.  Broadband dielectric spectroscopy on a discotic liquid crystalline polymer , 1989 .

[11]  Patel,et al.  Thin-cell dielectric response of a ferroelectric liquid crystal. , 1987, Physical review. A, General physics.

[12]  R. Meyer.  Ferroelectric Liquid Crystals; A Review , 1977 .

[13]  Kremer,et al.  Order-parameter fluctuations in a ferroelectric liquid crystal by broadband dielectric spectroscopy. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[14]  Nguyen,et al.  Slowing down of molecular rotation at the smectic-A-->smectic-C transition of liquid crystals. , 1989, Physical review letters.

[15]  B. Žekš,et al.  Dielectric Relaxation and the Determination of the Sm A-Sm C* Phase Transition Temperature in DOBAMBC , 1988 .

[16]  L. Benguigui.  Dielectric relaxations in a liquid crystal with helicoidal dipole ordering , 1982 .

[17]  M. Ozaki,et al.  The characteristic dielectric behaviour in ferroelectric liquid crystals at a phase transition and the contribution of the soft mode , 1989 .