The dependence of the magnitude of the spontaneous polarization on the cell thickness in ferroelectric liquid crystals |
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| Institution: | 1. Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt;2. Nanosensor Lab, School of Applied Sciences, Kalinga Institute of Industrial Technology (KIIT), Deemed to be University, Bhubaneswar 751024, Odisha, India;1. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India;2. Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory (CSIR-NPL) Campus, Dr. K. S. Krishnan Road, New Delhi, 110012, India;1. Department of Electronic and Electrical Engineering, Trinity College, The University of Dublin, Dublin 2, Ireland;2. Department of Electrical and Electronic Engineering, TU Dublin, Dublin 7, Ireland;3. Department of Chemistry, University of Hull, Hull HU6 7RX, UK;1. Liquid Crystal Research Lab, Department of Physics, Dr B R Ambedkar National Institute of Technology Jalandhar, Punjab 144008, India;2. Advanced Research Material and Solutions (ARMS), Technology Business Incubator (TBI) IISER-Mohali, Mohali, Punjab, India;3. Centre for Advanced Research and Development (CARD), CHRIST University, Hosur Road, Bangalore 560029, Karnataka, India |
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| Abstract: | The magnitude of the spontaneous polarization (P) was measured for S-3,7-dimethyloctyl 4-n-hexadecyloxybenzoyloxybenzoate, a material with an isotropic to smectic C phase transition (Tc), using a triangular wave method. The temperature dependence of the measured values was well represented by the expression P = P0(Tc-T)α· P0 was found to depend on the cell thickness for thicknesses below 18 μm, but saturated to a constant value above this limit. The value of the exponent α, on the other hand, was found to be insensitive to the cell thickness. The decreased value of the polarization in the thin cells is thought to be a result of polarization screening due to ionic impurities. |
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