Study of the Effect of Rare Earth Ions on the Structural, Magnetic and Electrical Properties of Cu-Zn Ferrites

Abstract

Rare earth substituted Fe in Cu-Zn ferrites are well-known technological magnetic materials used for manufacturing of multilayer chip inductor and applications in various electrical devices. The present work is focused on the effect of rare earth ion on structural, magnetic and transport properties of (Cu0.5Zn0.5Fe2-x)RExO4 [ x = 0.00, 0.05 and 0.10] ferrites where RE = La and Sm were prepared by solid state reaction technique keeping in view of their ionic radial and valences for maintain the charge neutrality sintered at 1100oC with 3 hours holding time. The Xray diffraction analysis revealed that rare earth free sample shows formulation of single phase cubic spinel structure with no extra peak but other two La and Sm substituted Fe in Cu-Zn samples show additional peaks other cubic spinel structure and corresponding to a second orthoferrite phase. Lattice parameter, bulk density, Xray density and porosity of the studied samples are increased with both La or Sm substituted ions. Lattice parameter of both series are slightly decrease with increase x content. A significant increase in initial permeability about 620 is found in (Cu0.5Zn0.5Fe1.95)La0.05O4 but increase La content decrease initial permeability. This enhancement of permeability may be correlated with improved microstructural features. But the initial permeability decreases with increasing Sm ions in ferrite. Quality factor signifies the merit of the material from the application point of view. The dielectric constant is found to decrease continuously with increasing frequency and remain almost constant at higher frequency range. The dielectric behavior of the experimental ferrite samples explained on the basis of the mechanism of the dielectric polarization and conduction process. The decrease of saturation magnetization with increasing of both rare earth substitutions has been explained on the Neel’s collinear two sublattices magnetization model and Yafet-Kittels non-collinear magnetization model.