Effects of Mg substitution on the structural and magnetic properties of Co sub(0.5)Ni sub(0.5-x)

In this study, nanocrystalline Co-Ni-Mg ferrite powders with composition Co sub(0.5)Ni sub(0.5-x)Mg sub(x)Fe sub(2)O sub(4) are successfully synthesized by the co-precipitation method. A systematic investigation on the structural, morphological and magnetic properties of un-doped and Mg-doped Co-Ni...

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Bibliographic Details
Published in:Chinese physics B 2016-04, Vol.25 (4), p.47501-47507
Main Authors: Othaman, Z, Hussin, R, Ati, Ali A, Samavati, Alireza, Dabagh, Shadab, Zare, Samad, Rosnan, R M
Format: Article
Language:English
Subjects:
Coprecipitation
Ferrite
Fourier transforms
Infrared spectroscopy
Magnetic properties
Magnetization
Spinel
X-ray diffraction
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Summary:In this study, nanocrystalline Co-Ni-Mg ferrite powders with composition Co sub(0.5)Ni sub(0.5-x)Mg sub(x)Fe sub(2)O sub(4) are successfully synthesized by the co-precipitation method. A systematic investigation on the structural, morphological and magnetic properties of un-doped and Mg-doped Co-Ni ferrite nanoparticles is carried out. The prepared samples are characterized using x-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and vibrating sample magnetometry (VSM). The XRD analyses of the synthesized samples confirm the formation of single-phase cubic spinel structures with crystallite sizes in a range of similar to 32 nm to similar to 36 nm. The lattice constant increases with increasing Mg content. FESEM images show that the synthesized samples are homogeneous with a uniformly distributed grain. The results of IR spectroscopy analysis indicate the formation of functional groups of spinel ferrite in the co-precipitation process. By increasing Mg super(2+) substitution, room temperature magnetic measurement shows that maximum magnetization and coercivity increase from similar to 57.35 emu/g to similar to 61.49 emu/g and similar to 603.26 Oe to similar to 684.11 Oe (1 Oe = 79.5775 A.m super(-1)), respectively. The higher values of magnetization M sub(s) and M sub(r) suggest that the optimum composition is Co sub(0.5)Ni sub(0.4)Mg sub(0.1)Fe sub(2)O sub(4) that can be applied to high-density recording media and microwave devices.
ISSN:1674-1056
1741-4199
DOI:10.1088/1674-1056/25/4/047501