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We present the properties of different achiral orthogonal polar smectic phases observed in a homologous series of bent-core molecular compounds. The macroscopically uniaxial SmAPR phase transforms to biaxial state by the application of higher electric ﬁelds and biaxial SmAPA phase undergoes biaxial-uniaxial-biaxial texture transformation with increasing electric ﬁelds,i.e.,initial antiferroelectric structure transforms into ferroelectric state under higher electric ﬁelds and it shows three different optically distinguishable states. The SmAPAR phase shows an entirely different response compared to other polar smectic phases under study. The dielectric measurements in the SmAPAR phase is the evidence of antiferroelectric behavior of uniaxial state. The polarizing microscopy texture observation supports the corresponding biaxiality measurements.
Lehmann, A. et al. (2012). Properties of non-tilted bent-core orthogonal smectic liquid crystal. Molecular Crystals and Liquid Crystals , vol. 553, pg. 140-146. DOI:10.1080/15421406.2011.609457