Influence of the deviation from stoichiometry on the magnetic properties of Zn-rich NiZn ferrites

The influence of the deviation from stoichiometry on the magnetic properties has been investigated on the compositions given by the formula (NiO) α (ZnO) 1-α (Fe 2 O 3 ) x where α = 0.30 ; 0.36 and 0.9 s , T c ), the influence of the deviation is much lower but unambiguous. It is the variation of the Curie temperature with x which is responsible for the large susceptibility variations (previously mentionned by other authors at room temperature). The variation of T c could be related to the variation of the lattice constant with x.