Dielectric Relaxation in the Metastable Modification of the Solid Phase of p-Methoxybenzylidene-p'-n-Butylaniline (MBBA)

The paper presents an analysis of the results of studies of dielectric relaxation in the metastable modification of solid MBBA. The experimental values of permittivity ϵ′(ω) and losses ϵ″(ω) can be described by a skewed Davidson-Cole arc. To get an understanding of the relaxation process, the model of “defect” diffusion of Glarum is considered and the Fröhlich-Kirkwood factors of interdipolar correlation are calculated. This constitutes a basis for proposing a model which assumes correlation between the rotation of the dipolar methoxy group about the O—C bond of the molecule and the conformational motions of the butyl group causing local fluctuations (“defects”) in the crystal lattice.