Effects of sintering temperature on the magnetic properties of Cr substituted Mn-Zn ferrite

Effects of sintering temperature on the magnetic properties of Mn
_0.50
Zn
_0.50
Cr
_0.4
Fe
_1.6
O
₄
have been studied. Ferrite samples were synthesized by combustion method and sintered at various temperatures (1250, 1300 and 1350°C). The structural properties were investigated by X-ray diffraction and indicate that the sample possesses single phase cubic spinel structure. Sintering temperatures (T
_s
) significantly affect on densification, grain growth and initial permeability of the samples. The average grain size (D), bulk density (ρ
_B
), real part of the initial permeability (μ'i) increases with increase in sintering temperature whereas coercive field (H
_c
) decreases. The μ'i strongly depends on average grain size, density and intragranular porosity. The B-H loop of the composition was measured at room temperature. The H
_c
and hysteresis losses were found to decrease hence softening the material.