Abstract
Abstract An achiral Non-Symmetric Bent Liquid Crystal (BLC) with a Oxadiazole based hetero cyclic central moiety, abbreviated as C 12 C 10 viz., dodecyl[4-{5-(4′-decyloxy)biphenyl-4-yl}-1,2,4-oxadiazol-3-yl]benzoate, exhibiting FerroElectric (FE) response is reported. Product is confirmed by 1 H NMR, 13 C NMR and elemental analysis. Characterization of BLC phases is carried out by Polarized Optical Microscopy (POM), Differential Scanning Calorimetry (DSC), Spontaneous Polarization ( P S ) and Low Frequency (10 Hz–10 MHz) Dielectric Relaxation studies. C 12 C 10 exhibits enantiotropic LC SmA, FE B 2 , SmG, SmE phase variance. I–SmA, B 2 –SmG and SmG–SmE transitions are of first order nature. FE B 2 phases exhibits a moderate P S of ~80 nC cm −2 . B 2 phase exhibits Curie–Weiss behavior to confirm FE nature. Off-centered low frequency (KHz) dispersion infers a scissor mode and a high frequency (MHz) mode to reflect the distinct time-scale response. Dielectric Dispersion is relatively susceptible in lower frequency KHz region. Arrhenius shift in Relaxation Frequency ( f R ) infers higher activation energy ( E a ) in non-FE phases for HF mode and lower value for KHz mode. Trends of f R , dielectric strength Δ e , α-parameter and E a are discussed in view of the data reported in other LC compounds.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call