Dielectric Properties in SmC~* Ferroelectric Liquid Crystals

The molecular theory of the dielectric properties in SmC* ferroelectric liquid crystals is presented. The free energy density of liquid crystals system at the external alternating electric field is obtained. The approximate formula of polarization P and complex dielectric constant e* are obtained. It is shown that the e* is a function of the angular frequency and amplitued of the applied electric field , temperature and molecular structure parameters of liquid crystals.