Abstract
Zinc ion-substituted cobalt ferrite powders Co1−xZnxFe2O4 (x = 0–0.7) were prepared by the sol-gel auto-combustion process. The structural properties and magnetic of the samples were investigated with X-ray diffraction (XRD), superconducting quantum interference device, and a Mössbauer spectrometer. The results of XRD showed that the powder of a single cubic phase of ferrites calcined when kept at 800 °C for 3 h. The lattice constant increases with increase in Zn concentration, but average crystallite size does not decrease constantly by increasing the zinc content, which is related to pH value. It was confirmed that the transition from ferrimagnetic to superparamagnetic behaviour depends on increasing zinc concentration by Mössbauer spectra at room temperature. Magnetization at room temperature increases for x ≤ 0.3, but decreases for increasing Zn2+ ions. The magnetization of Co0.7Zn0.3Fe2O4 reached maximum value (83.51 emu/g). The coercivity decreased with Zn2+ ions, which were doped on account of the decrease of the anisotropy constant.
Highlights
Materials 2018, 11, 1799 constant of the ferrite Co1−x Znx Fe2 O4 decreases with an increase in Zinc content, but the Direct current (DC) electrical resistivity decreases by increasing the calcination temperature, which ensures the semi-conductor performance of the sample [5]
The X-ray diffraction (XRD) indicates that the ferrite Co1−x Znx Fe2 O4 calcined at 800 ◦ C is a single-phase cubic spinel structure
The increase of the lattice parameter is attributed to replacement of smaller Co2+ ions by larger Zn2+ ions
Summary
It is a hard ferromagnetic material, which has high coercivity of 5000 Oe, a high Curie temperature (TC ) of 520 ◦ C, moderate saturation magnetization of approximately 80 emu/g, a high anisotropy constant of 2.65 × 106 –5.1 × 106 J/m3 , and a high magneto-strictive of −225 ppm [1,2]. The saturation magnetization, electrical resistivity, coercivity, permittivity, and permeability of cobalt ferrite can be modified with partial replacement of non-magnetic zinc cations. Materials 2018, 11, 1799 constant of the ferrite Co1−x Znx Fe2 O4 decreases with an increase in Zinc content, but the DC electrical resistivity decreases by increasing the calcination temperature, which ensures the semi-conductor performance of the sample [5]. The aim was to study variation in structural and magnetic performance of cobalt ferrite powders with partial substitution of non-magnetic zinc cations
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