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Abstract
Two compounds with very similar chemical formulae but different phase sequences, denoted by F3H6 and F4H6, have been studied by dielectric, optical and TSM measurements, and by optical and polarization hysteresis loops. The light diffraction technique was used to measure the helical pitch (p), which was found to be nearly temperature independent. Six relaxation modes have been identified. The polarization and tilt angle results are discussed using a simple phenomenological model and fitted to the equation A B P 0 1 Omega 1 theta 2. theta 0 epsilonepsilon 0 C C 0 The parameters C and Omega were determined from the fitting.
