화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.541, 500-507, 2011
Characterization of Collective Relaxation Modes of a Ferroelectric Mixture Through Dielectric Spectroscopy
Molecular motion of a ferroelectric mixture has been studied by the dielectric spectroscopy in the frequency range of 1 Hz to 35 MHz in different mesophases viz. chiral nematic (N*), ferroelectric (SmC*) and hexatic (SmI*) phases. One soft like relaxation process in the N* phase and usual Goldstone mode in the SmC* phase have been found. A new mode has been detected at similar to 50 Hz in the vicinity of SmC*-SmI* phase transition. The dielectric strength of this mode is highly temperature dependent and increases as temperature decreases. Two modes in different frequency ranges (kHz and few hundred Hz ranges) have been detected in the SmI* phase.