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We report the observation of biaxial nematic phase in a bent-core molecular system in which the biaxiality exists on a microscopic scale using polarizing microscopy, electro-optics and dielectric spectroscopy. An application of electric field induces a macroscopic biaxiality and therefore electro-optic switching. The observed electro-optic switching is explained in terms of the interaction of the ferroelectric clusters with the electric field. Dielectric spectra of the sample shows existence of low-frequency collective processes related to the microscopic polar clusters. The dielectric constant changes its sign from positive to negative and again to positive values.
Keith, C. et al. (2011). Dielectric and optical study of biaxial bent-core nematic liquid crystal. Molecular Crystals and Liquid Crystals vol. 540, pp. 75-81. DOI:10.1080/15421406.2011.568335