XRD analysis and bulk magnetic properties of Al3+ substituted Cu-Cd ferrites

Cu0.7Cd0.3AltFe2-tO4 (t = 0, 0.05, 0.1,. . .,0.3) ferrites were prepared by standard ceramic method to investigate the lattice parameter, grain size, magnetization and initial permeability variations as a function of Al3+. Decrease of lattice parameter with Al3+ addition is related to the ionic sizes of the cations. The magnetization is governed by three sublattice model. Temperature variation of susceptibility shows that these ferrites contain a mixture of SD and MD grains. The initial permeability follows the Globus model. The decrease in mu(i) is attributed to a decrease in grain size and increase in K-1. Al3+ substitution causes impedence to the domain wall motion. (C) 1999 Published by Elsevier Science S.A. All rights reserved.