PYROELECTRIC PROPERTIES OF CHIRAL SMECTIC PHASES

L. Blinov , L. Beresnev , N. Shtykov , Z. Elashvili

The temperature dependences of the pyroelectric coefficient γ(T) of ferroelectric liquid crystalline L-p-decyloxy- and L-p-nonyloxybenzylidene-p'-amino-2-methylbutylcinnamate and their mixture were calculated from the measurements of their responses to heat pulses with durations of 2 x 10-4 and 3 x 10-8 s. The frequency dispersion of γ and the spontaneous polarization Ps was discovered which is consistent with the corresponding dispersion of dielectric permittivity over a frequency range 104-2 x 105 Hz. The direct measurements of the relaxation time for spontaneous polarization (τ) were performed and sharp increase in τ near the SmC-SmA phase transition was observed. The effect of dipolar admixtures on γmax and Pmaxs was also discussed.

Domaines: Articles anciens

L. Blinov, L. Beresnev, N. Shtykov, Z. Elashvili. PYROELECTRIC PROPERTIES OF CHIRAL SMECTIC PHASES. Journal de Physique Colloques, 1979, 40 (C3), pp.C3-269-C3-273. ⟨10.1051/jphyscol:1979351⟩. ⟨jpa-00218747⟩