Initial susceptibility studies on Cu-Mg-Zn ferrites

Abstract

Cu(0.5-x)MxZn0.5Fe2O4 ferrites were synthesised by thermal decomposition of oxalate complexes by co-precipitation technique using oxalate precursors. X-ray diffraction studies revealed a single spinel phase with un-detectable impurity phases. Lattice parameter showed a decreasing trend with increasing Mg2+ content, which is attributed to the ionic sizes of Mg2+ and Cu2+ ions. The temperature variation of susceptibility for oxalate complex decomposed at 600 degrees C did not exhibit peak in chi(ac) to T variation. Ferrites with x less than 0.4 sintered at 950 degrees C showed small peak in chi(ac) to T near T-c. However chi(ac) to T variation for the ferrites sintered at 1000 degrees C exhibited MD type grains in predominance. The domain wall width increases with the addition of Mg2+ content. Particle size distribution (PSD) indicated absence of fine particles predominantly. Therefore double T behaviour is not exhibited by the samples. Initial permeability and initial susceptibility increase with increase in Mg2+ content.