Evidence of both unusual dielectric mode at low frequencies and the co-existence of antiferroelectric, ferroelectric and paraelectric phases in a novel antiferroelectric liquid crystals mixture

Abstract

The dynamics of different collective and non-collective relaxation processes were investigated in a new mixture which displays ferroelectric and antiferroelectric properties by dielectric spectroscopy. The experimental data, collected in function of frequency, temperature and under bias filed, were analyzed using a generalized Havriliak-Negami expression, leading to many dielectric relaxation modes. The results obtained through the dielectric spectroscopy and optical microscopy suggest a coexistence of different phases and hereditary dielectric peaks. A deep penetration of the Goldstone mode also occurs during isotropic phase.