Pressure and temperature studies of dielectric permittivity in the homogeneous phase of nitrobenzene–dodecane binary mixture

Abstract

Results of isothermal high-pressure (up to 120 MPa) and isobaric ( P=0.1 and 51 MPa) temperature studies of dielectric permittivity in nitrobenzene–dodecane binary solution are presented. The dependencies of ε( P) and ε( T) obtained can be well portrayed by isomorphic relations with the same value of the critical exponent φ=1− α≈0.88. The influence of correction-to-scaling terms for the temperature and pressure paths is shown. It has been found that the strength of the pretransitional anomaly of the isothermal pressure path is definitely larger than that of the isobaric temperature path. The influence of the Maxwell–Wagner effect was found to be insignificant in the isothermal pressure studies even for a frequency of 100 Hz. Data were completed by the results of low-frequency (250 kHz) measurements of the shift of dielectric permittivity due to application of a strong electric field (the non-linear dielectric effect).