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Abstract
FeSiAl/Ni0.4Zn0.45Co0.15Fe2O4 ferrite core–shell particles and cylindrical magnetic cores have been synthesized by sol–gel auto-combustion method. The magnetic cores were prepared by pellet molding process and high temperature annealing at 700 °C for 1 h. The reaction, surface morphology and magnetic properties of FeSiAl/ Ni0.4Zn0.45CoFe2O4 ferrite cores have been investigated by Differential thermal analysis-thermogravimetry (DTA-TG), X-ray diffraction (XRD), the impedance analyzer and Vibration sample magnetometer (VSM). The results indicates that there are three stages to form ferrite. The cores of unphosphated FeSiAl/Ni0.4Zn0.45CoFe2O4 ferrite will be oxidized in air at 700 °C. The spinel ferrites are successfully prepared by sol–gel and form a homogeneous as well as porous structure on the surface of the cores. The maximum permeability is 41 at 6 wt% ferrite. Ms decreases from 106.6 emu/g to 103.6 emu/g, with the increase of ferrite content.
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