Effects of Co-substitution on the structural and magnetic properties of NiCoxFe2?xO4 ferrite nanoparticles |
| |
| Affiliation: | 1. Department of Physics & Materials Science, Jaypee University of Information Technology, Waknaghat 173234, India;2. Department of Physics and Materials Science, Jaypee Institute of Information Technology, A-10, Sector-62, Noida 201307, India;3. Department of Physics, Himachal Pradesh University, Shimla 171005, India;1. Department of Chemistry, Panjab University, Chandigarh, India-160014;2. Department of Science and Technology, New Delhi;3. ICON Analytical Equipment (P) Ltd., Mumbai - 400018, India;1. Nanotechnology Laboratory, Department of Physics & Materials Science, Jaypee University of Information Technology, Waknaghat, 173234, India;2. Department of Physics and Materials Science, Jaypee Institute of Information Technology, A-10, Sector-62, Noida 201307, India;1. Department of Physics, Deenbandhu Chhotu Ram University of Science & Technology, Murthal, 131039 Haryana, India;2. Department of Instrumentation, Kurukshetra University, Kurukshetra, 136119 Haryana, India;3. Materials Science Division, Inter University Accelerator Center, 110067 New Delhi, India;4. CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, 110012 New Delhi, India;1. School of Materials Science and Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea;2. Department of Physics, Indian Institute of Science, Bangalore 560012, India |
| |
| Abstract: | The sol–gel auto-combustion method was used to prepare nanocrystalline powders of Co-substituted nickel ferrite with the general formula NiCoxFe2?xO4 (x=0.0, 0.1, 0.25, and 0.5). The effects of Co-doping on the structural, morphological, and magnetic properties of the samples were subsequently evaluated by X-ray diffraction (XRD), Fourier transform infrared (FTIR), field emission scanning electron microscopy (FE-SEM), and vibrating sample magnetometer (VSM). Using the MAUD program, the full pattern fitting of Rietveld method was employed to determine the exact coordinate of the atoms, unit cell dimensions, and ion occupancy. X-ray diffraction measurements by Rietveld refinement confirmed the crystalline structure and phase purity of all the ferrites prepared. FTIR results also confirmed the formation of a spinel phase and FE-SEM images showed that the particles were in the nanosize range. Moreover, Rietveld analysis and saturation magnetization (Ms) revealed that Co3+ replaced Fe3+ in the tetrahedral A-sites up to x=0.1. then, it replaced Fe3+ in both A- and B-sites for x≥0.25. Finally, VSM results demonstrated that while Ms remained nearly constant with increasing Co3+ substitution, coercivity (Hc) increased significantly. It may be suggested that the larger magneto-crystalline anisotropy of Co3+ ions is responsible for the increased Hc observed in the Co-doped Ni ferrite samples. |
| |
| Keywords: | Ni ferrite Co-doping X-ray diffraction Saturation magnetization Coercivity |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
