Electrical conductivity and magnetic transition phase in ferrites

The dielectric relaxation frequency, f(x), which is associated with bulk po larization processes in Ni-Zn and Mn-Zn polycrystsaline ferrites, was inves tigated by using impedance spectroscopy. The behavior of f(x) showed a clea r maximum as a function of the temperature. This maximum agrees with Curie temperature, which was determined by an independent magnetic technique. The se results show that impedance spectroscopy can be effectively used to stud y the ferri-paramagnetic transition.