The Clausius–Mossotti approximation in the theory of polar materials

The Clausius–Mossotti approximation is extended to describe the measured magnetic moment of an ellipsoidal sample containing magnetic or nonmagnetic ellipsoidal inclusions and a magnetic or nonmagnetic matrix. The magnetic field in the matrix and inclusions is calculated. The magnetic energy of a system is calculated as well. The equilibrium shape of a pore in a ferromagnetic sample is investigated. The phenomenon of a cavitation in porous ferromagnetic samples is discussed. The application of the model to granular superconductive samples is given. The effective conductivity of a sample, containing an arbitrary number of differently ordered distributions of ellipsoidal inclusions is calculated.