Dielectric behaviour of granular semi-conducting aggregates, with special reference to some magnesium ferrites

Aggregated granular semi-conductors can display high permittivities and dispersion effects which vary with temperature and voltage. This behaviour need not be characteristic of the granule material: can be a consequence of its conductivity and of a particular kind inhomogeneity of the aggregate arising from the contact structure the intergranular boundaries. The dielectric properties of certain sintered magnesium ferrites can be accounted for in this way.