Substitution of chromium in Mn-Zn ferrite and its effect on structural
and magnetic properties has been studied. Samples were
synthesized by combustion method and sintered at various
temperatures (Ts). XRD patterns indicate that the samples are of
single phase cubic spinel structure. The lattice parameter decreases
with increase with substitution of Cr3+ content. Average grain size
(D), bulk density (ρB), initial permeability (μi
), Néel temperature (TN)
decrease with the increase in chromium content. ρB was found to
increase with increase in Cr3+ content as the Ts is increased. The Ts
affect the densification, grain growth and μi
/ of the samples. μi
strongly depends on D, density and intragranular porosity. TN was
found to decrease with the increase in Cr3+ concentration. This is
attributed to the weakening of A-B interaction. The sharp fall of μi
TN indicates that the compositions are homogeneous. Saturation
magnetization (Ms), Coercive field (Hc), Residual induction (Br) were
studied as a function of Cr3+ content. The Ms was found to decrease
with the increase of Cr3+ content, which is attributed to the dilution of
A-B interaction. The inclusion of Cr3+ caused the Ms, Br and
hysteresis losses to decrease.
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