Phason and amplitudon relaxation processes of a low pitch and large spontaneous polarization ferroelectric liquid crystal mixture

Dielectric strength(Delta epsilon), relaxation frequency(f(rg)), Cole-Cole distribution parameter (h) and de conductivity (sigma (dc)) for phason fluc tuations in SmCa phase and amplitudon fluctuations in SmA* phase have been determined for a 15 mum thick planar oriented ferroelectric liquid crystal mixture FLC#252 of high spontaneous polarization and low pitch (z=0.3-0.5 m um). From the dielectric strength and relaxation frequency of the Goldstone mode, phason rotational viscosity (gamma (phi)) and elastic constant (K-ph i) have been calculated, Away from the transition temperature (T-C*(A)*=51. 4 degreesC), phason relaxation frequencies and rotational viscosities obey the Arrhenius behaviour. The soft mode relaxation frequencies in SmA* phase (f(rs)) do not follow the Arrhenius nature, whereas the soft mode rotation al viscosities (gamma (theta)) obey it. For the soft mode in SmA* phase it is observed that dielectric strength (Delta epsilon (s)), dielectric loss ( epsilon"((max))) and (r-1) (r is the ratio of the static dielectric constan t epsilon (0) to the high frequency limiting dielectric constant epsilon(pr oportional to)) follow the Curie-Weiss law.