Structural, Spectral, Morphological, Dielectric, Magnetic, and Optical Properties of La-Ni ions co-substituted CoFe₂O₄ Nanoparticles

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• 作者：Vadivel M. ; Ramesh Babu R. ; Arivanandhan M.…
• 关键词：Magnetic materials ; Chemical synthesis ; Precipitation ; Dielectric properties
• 刊名：Journal of Superconductivity and Novel Magnetism
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：30
• 期：2
• 页码：441-453
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1557-1947
• 卷排序：30

文摘

The present study focused on the structural, morphological, dielectric, magnetic, and fluorescence properties of lanthanum-nickel (La-Ni) ions co-substituted cobalt ferrite (CoFe₂O₄) magnetic nanoparticles prepared by a co-precipitation method. X-ray diffraction results reveal that the lattice constant of CoFe₂O₄ nanoparticles initially decreases and thereafter increases with increasing La-Ni ions concentration. The Fe–O symmetrical stretching vibrations of CoFe₂O₄ nanoparticles were identified by Fourier transform infrared spectral analysis. Surface morphology was remarkably modified due to the substitution of La-Ni ions in CoFe₂O₄ nanoparticles. Transmission electron microscopy analysis implies that the size and shape of co-substituted CoFe₂O₄ nanoparticles were slightly varied from those of undoped CoFe₂O₄ nanoparticles. The dielectric constant was enhanced with the substitution of La-Ni ions in CoFe₂O₄ nanoparticles. Magnetic properties gradually decrease with increasing La-Ni ions concentration. Fluorescence study shows that the emission peak intensity increases with increasing La-Ni ions substitution. From the results, it is obvious that the substitution of La-Ni ions significantly enhances the dielectric and fluorescence properties of CoFe₂O₄ nanoparticles.