The influence of a magnetic field on dielectric relaxation processes

2014 The influence of a magnetic field on the dielectric losses in weak-polar dielectric compounds is investigated. By the solution of the Fokker-Planck equation describing the rotational diffusion of the polar group over a potential barrier it is shown that with the increasing of a magnetic field the maximum of the dielectric loss curve tg 03B4 is shifted to the higher temperatures and diminished, in accordance with the experimental data [3, 4]. J. Phys. France 51 (1990) 1229-1238 1 er JUIN 1990, Classification Physics Abstracts 77.40 61.40 The list of symbols. U(O) the potential energy of a particle on a sphere which models polar groups in polytetrafluoretilen. 0 : the polar angle of the particle with respect to the « easy polarization » axis z. (P : the azimuth angle of the particle under consideration. Ç : the angle between the vector of magnetic field induction B and the polar axis z. f3 : the angle between B and the alternating electric field E(t) = Eo cos (lût). m : the mass of the particle. q : the electric charge of the particle. r : the radius of the sphere on which the particle is moving. y : the phenomenological friction coefficient of the particle (the viscous relaxation frequency). f2 : the frequency associated with the top of the barrier : Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphys:0199000510110122900