Effects of Annealing on the Saturation Induction of Ferrites Containing Nickel and/or Copper

Abstract

The equilibrium distribution of copper between octahedral and tetrahedral sites in the ferrites varies appreciably with temperature. The rate at which these ions approach their equilibrium distribution at a fixed temperature, after quenching from a higher temperature, is much greater for the slightly reduced materials. Previously unreported deviations from a smooth variation of saturation induction with annealing temperature have been observed in ferrites containing nickel and/or copper that have been prepared to achieve a high degree of homogeneity and hence to be relatively free from defects.