X-RAY-DIFFRACTION STUDY OF 90.8 AND 100.6

As a part of our detailed comparative studies of groups of Liquid Crys talline compounds belonging to N(p-n-Alkyloxy Benzylidene) P'- Alkylan ilines, (nO.m's), we present here the phase transition studies of the compounds 90.8 and 100.6 using X-Ray diffraction study. The compounds 100.6 and 90.8 exhibit ACFG phase variant. The temperature dependence of tilt angle in Sm C and Sm F phases in both of the compounds is pres ented. A comparative study of tilt angle measured by different experim ental techniques is also presented.