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Role of Cr super(3+) ions on the microstructure development, and magnetic phase evolution of Ni sub(0.7)Zn sub(0.3)Fe sub(2)O sub(4) ferrite nanoparticles
A series of ferrite samples with the chemical formula Ni sub(0.7)Zn sub(0.3)Cr sub(x)Fe sub(2-x)O sub(4) (x = 0.0-0.5) were prepared by a sol-gel auto-combustion method and annealed at 600 degree C for 4 h. The resultant powders were investigated by various techniques, including X-ray diffractometry...
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Published in: | Journal of alloys and compounds 2012-01, Vol.512 (1), p.316-322 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | A series of ferrite samples with the chemical formula Ni sub(0.7)Zn sub(0.3)Cr sub(x)Fe sub(2-x)O sub(4) (x = 0.0-0.5) were prepared by a sol-gel auto-combustion method and annealed at 600 degree C for 4 h. The resultant powders were investigated by various techniques, including X-ray diffractometry (XRD), vibrating sample magnetometry (VSM), and permeability studies. The prepared samples have a cubic spinel structure with no impurity phase. As the Cr super(3+) content x increases, bulk density and crystallite size decrease, whereas porosity increases. The saturation magnetization decreases linearly from 58.31 to 42.90 emu/g with increasing Cr super(3+) content. However, coercivity increases with increasing Cr super(3+) substitution. The magnetic moments calculated from Neel's molecular-field model are in agreement in the experiment results. The initial permeability ( mu sub(i)) decreases with increasing Cr super(3+) substitution. The decrease in initial permeability ( mu sub(i)) is attributed to decrease in magnetization on addition of Cr super(3+). The real part of the permeability decreases gradually with increasing frequency in accordance with Snoek's law. The Curie temperature decreases linearly with increasing Cr super(3+) content. |
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ISSN: | 0925-8388 |
DOI: | 10.1016/j.jallcom.2011.09.087 |