| Abstract: | The variation of the ultrasonic velocity with temperature in the liquid crystal 4′-n-octyloxy-4-cyanobiphenyl (80CB) at four different fixed ultrasonic frequencies is studied. From these studies various relaxation parameters like the adiabatic relaxation time, velocity at zero frequency, in the vicinity of isotropic-nematic phase transition and velocity at infinite frequency are estimated. From these parameters the relaxation mechanism in the vicinity of isotropic-nematic phase transition is studied and the results are discussed. |
