Phase transition studies in polymesomorphic compounds (ii): Ultrasonic velocity studies in<i>N</i>-(<i>p-n</i>-hexyloxy benzylidene)<i>p-n-</i>butyl aniline

Abstract

Abstract The variation of ultrasonic velocity in N-(p-n-hexyloxy benzylidene) p-n-butyl aniline with temperature in the isotropic, nematic, SA SB and SG phases is measured. All the phase transitions are of first order. The adiabatic compressibility β ad , molar sound veclocity or Rao number Rn , and molar compressibility or Wada constant A are computed. Molar sound velocity and molar compressibility of HBBA are compared with the values of other compounds. They are found to be in good agreement with theory.