Effect of Al3+ substitution on structural,cation distribution,electrical and magnetic properties of CoFe2O4 |
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| Affiliation: | 1. Department of Physics, National Institute of Technology, Hamirpur Himachal Pradesh, 177005, India;2. National Physical Laboratory, New Delhi 110012, India;3. Centre for Material Science and Engineering, National Institute of Technology, Hamirpur, Himachal Pradesh 177005, India;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P.R. China;3. Department of Physics, Zunyi Normal College, Zunyi 563002, P.R. China;1. School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47906, USA;2. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, USA;1. Department of Physics, National Institute of Technology, Hamirpur, H.P. 177005, India;2. UGC-DAE Consortium for Scientific Research at Indore, M.P. 452 001, India;3. Centre for Material Science and Engineering, National Institute of Technology, Hamirpur, H.P 177005, India |
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| Abstract: | We present the structural, cation distribution, electrical and magnetic studies of CoAlxFe2−xO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8) ferrites. The Rietveld-fitted X-ray diffraction (XRD) patterns confirm the formation of single-phase cubic spinel structures with space group for all the samples. A comprehensive analysis of XRD-based cation distribution has been performed to see the effect of Al3+ ions substitution on various structural parameters such as site ionic radii, edge length, bond length and interionic distances. The dielectric constant and direct current (DC) conductivity decreases with increasing Al3+ substitution up to x = 0.4. However, with further increase in Al3+ substitution, both the dielectric constant and the DC conductivity increase. The presentation of dielectric data in the complex electric modulus form reveals the presence of a non-Debye-type relaxation behaviour in the considered ferrites. The power law behaviour of alternating current (AC) conductivity indicates a strong correlation among electrons in these systems. The isothermal magnetisation versus applied field curves with high-field slope and significant coercivity suggest that the studied materials are highly anisotropic with canted spin structures. The samples exhibit ferrimagnetic behaviour at 300 K and the magnetisation decreases with increasing Al3+ concentration. The as-prepared samples are promising candidates for various industrial applications. |
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| Keywords: | Ferrites Cation distribution Rietveld refinement Dielectric response |
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