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Structural, Electrical, Dielectric, and Magnetic Properties of Cd2+ Substituted Nickel Ferrite Nanoparticles
In the present investigation structural, electric, magnetic, and frequency dependent dielectric properties of Ni1−xCdxFe2O4 ferrite nanoparticles (NPs) (where x = 0.2, 0.4, 0.6, and 0.8) prepared by sol-gel autocombustion method were studied. The crystallite size (t) (46.89∼58.40 nm) was estimated from X-ray diffraction data with the postconfirmation of single phase spinel structure. Spherical shaped, fused grain nature with intergranular diffusion in Ni1−xCdxFe2O4 NPs was observed in scanning electron micrographs. The value of loss tangent (tan δ) decreases exponentially with an increasing frequency indicating normal Maxwell-Wagner type dielectric dispersion due to interfacial polarization. Decreasing values of Curie temperature (Tc)from 860°C to 566°C with increasing Cd2+ content x in Ni1−xCdxFe2O4 NPs were determined from AC-Susceptibility. Activation energy ΔE ranges within 0.03∼0.15 eV. Decreasing magnetic saturation Ms coercivity Hc and magneton number nB values show the effect on nonmagnetic Cd2+ ions over magnetic Ni2+ and Fe ions.
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