Effect of Ti&sup&4+&/sup& Doping on Structural, Electrical and Magnetic Properties of Ni&sub&0.4&/sub&Cu&sub&0.2&/sub&Zn&sub&0.4&/sub&Fe&sub&2-x&/sub&Ti&sub&x&/sub&O&sub&4&/sub& Ferrites

摘要

Ti~(4+) doped Ni_(0.4)Cu_(0.2)Zn_(0.4)Fe_(2-x )Ti_(x) O_(4) (x = 0.0, 0.02, 0.05, 0.07, 0.10) chemical compositions are prepared by conventional solid state reaction technique. The ferrite phase formation has been confirmed from the pattern of XRD. The theoretical density (ρ_(th) ), bulk density (ρ_(B) ), and porosity are calculated from the XRD data and using approximate formulas. Value of ρ_(th) is found to be greater than the value of ρ_(B) indicating the formation of pores inside the bulk specimens. The micro-structural investigation has been done using Field Emission Scanning Electron Microscope and it is found that the average grain size reduces with the increase of Ti content. Saturation magnetization (M_(s) ) also reduces with the increase of Ti content, contrarily remanent magnetization (M_(r) ) and coercivity (H_(c) ) increases with the concentration of Ti in the composition due to the pinning effect. The real part of the initial permeability is found to be maximum for the x = 0.02 sample which could be due to the homogeneity and high density of the sample. For increasing frequency, the dielectric constant and dielectric loss are observed to decrease.