Effects of Ni Concentration on the Structural and Magnetic Properties of NiZnFe₂O₄ Ferrites Synthesized via a Polymer Precursor

Abstract:

In this paper, we report the experimental observations of the effects of Ni concentration on the structural and magnetic properties of Ni_xZn_1-xFe₂O₄ (x=0.2-0.8) ferrite nanoparticles synthesized by a chemical method via a polymer precursor. The synthesis process involves a reaction of aqueous solutions of metal salts (Fe³⁺, Zn²⁺ and Ni²⁺) with an aqueous poly-vinyl alcohol (PVA)-sucrose solution at 65-70oC. Controlled growth of the ferrite nanoparticles was achieved by encapsulation of the nucleating sites in the PVA-sucrose polymer micelles. Structural properties of the derived samples were analyzed with X-ray diffraction (XRD) and X-ray absorption near edge spectroscopy (XANES) studies. The magnetic properties of the Ni_xZn_1-xFe₂O₄ (x=0.2-0.8) nanoparticles were evaluated at room temperature with a vibrating sample magnetometer (VSM). XRD analysis confirmed the formation of single phase cubic spinel ferrite structure. The local structural analysis of the Ni-Zn ferrite crystal system performed with XANES studies at Fe K-edge revealed the migration of Fe³⁺ ions from the octahedral sites to tetrahedral sites with the increase in Ni²⁺concentration in the ferrite structure.It was observed that the magnetization increases with the increase in Ni concentration till the maximum saturation magnetization was observed in the composition Ni_0.5Zn_0.5Fe₂O₄. Further increase in Ni concentration reduces the magnetization. The obtained results were analyzed in correlation with the cationic distributions at the lattice sites in these ferrite nanoparticles.

• Periodical: Journal of Nano Research (Volume 34)
• Pages: 9-16
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.34.9
• Online since: July 2015
• Authors: Jeevan Jadhav, Somnath Biswas*, A.K. Yadav, S.N. Jha, D. Bhattacharyya, N.K. Sahoo
• Keywords: Ferrites, Ni_xZn_1-xFe₂O₄, VSM, XANES, XRD

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