Phase transition and some physical properties of binary mixtures of two nematogenic compounds showing induced smectic phase

Abstract

Abstract The binary mixtures of nematogenic compounds 4-n-pentyl phenyl 4-n′-hexyloxy benzoate (ME6O.5) and 4-cyanophenyl 4-pentyl benzoate (CPPB) show the presence of induced smectic phase. In this article, we report the phase diagram and the results of refractive index, density, static dielectric permittivity and X-ray diffraction measurements of different binary mixtures of (ME6O.5 + CPPB) throughout the entire composition range. The density and refractive index values have been analysed to obtain orientational order parameters. The various physical properties of the system have been discussed on the basis of the phase diagram. Keywords: induced smectic phasedensityrefractive indexorientational order parameterstatic dielectric permittivity Acknowledgements We are grateful to Dr N. Naskar, IACS, Kolkata, India for DSC study. We are also grateful to Dr W. Piecek, Wojskowa Akademia Techniczna, Warszawa, Poland for his kind donation of dielectric cells used in this study. One of the authors (S.D.S.) is grateful to the UGC, New Delhi, India for the award of a teacher fellowship.