Abstract: (4508 Views)
Nickel doped CoMn ferrites with high magnetization were synthesized by double sintering solid state route with compositions of Co0.7-xNixMn0.3Fe2O4 with x = 0, 0.05, 0.1 and 0.15. Theoretical Cation distribution for cubic spinel ferrites was suggested on basis of electrical configuration expectations and cation site preferences. Cation distribution suggested was in good agreement with experimental results obtained from VSM and XRD. Values of theoretically calculated magnetic moment, coercivity and magnetization are in good agreement with experimental data obtained from VSM. Maximum saturation magnetization of 37.7emu/gm is obtained for sample Co0.7Mn0.3Fe2O4 at magnetic field of 5K Oe. Magnetostriction was found to increase with increasing magnetic field (from 1KOe to 5KOe.) Maximum magnetostriction of 84ppm was observed for sample Co0.7Mn0.3Fe2O4 at 5KOe. Maximum magnetization of magnetoelectric composites with 30% Co0.7-xNixMn0.3Fe2O4 – 70% PbZr0.48Ti0.52 was found to be 7.4 emu/g for composition with x = 0.
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Highlights:
1] Nickel-doped CoMn ferrites (with x values ranging from 0 to 0.15) were synthesized using a double sintering solid-state route.
2] Proposed theoretical cation distribution for cubic spinel ferrites based on electrical configurations and cation site preferences.
3] Agreement observed between the suggested cation distribution and experimental results from Vibrating Sample Magnetometer (VSM) and X-ray Diffraction (XRD).
4] Theoretical calculations of magnetic moment, coercivity, and magnetization aligned well with experimental VSM data.
5] Magnetostriction increased with the rise in the magnetic field, reaching a maximum of 84 ppm for the Co0.7Mn0.3Fe2O4 sample at 5 kOe.