Publications (5)10.67 Total impact
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Article: Permeability and magnetic properties of Al31 substituted Ni0.7Zn0.3Fe2O4 nanoparticles
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ABSTRACT: In this work, the structural and magnetic properties of Al3þ substituted Ni-Zn ferrite powders were investigated. Ni0.7Zn0.3AlxFe2�xO4 (where x¼0.0–0.5) powders were obtained by sol-gel auto combustion method. X-ray diffractometer, vibrating sample magnetometer, scanning electron microscopy, infrared spectroscopy, and permeability were used to study the effects of Al3þ ions on the structural and magnetic properties. X-ray patterns reveal that all the samples have single-phase cubic spinel structure. Infrared spectroscopy was used to locate the absorption bands and to study the influence of Al3þ substitution on the spinel structure of the presently investigated system. The lattice constant and x-ray density were calculated from the XRD data. The density of the samples was measured and consequently the porosity was calculated too. Magnetic properties were carried out by means of magnetization measurement to study the magnetic interaction between the ions. This paper is also focused its discussion on the dependence of the permeability spectra with the frequency variation. The permeability and Curie temperature were determined using the temperature dependent permeability measurements.Journal of Applied Physics 10/2012; 112:053908. · 2.17 Impact Factor -
Article: Permeability and magnetic properties of Al3+ substituted Ni0.7Zn0.3Fe2O4 nanoparticles
Journal of Applied Physics 01/2012; 112:043902. · 2.17 Impact Factor -
Article: Frequency and temperature dependent electrical properties of Ni0.7Zn0.3CrxFe2-xO4 (0 x 0.5)
Ceramics International 01/2012; 38:2963–2970. · 1.75 Impact Factor -
Article: Role of Cr3+ ions on the microstructure development, and magnetic phase evolution of Ni0.7Zn0.3Fe2O4 ferrite nanoparticles
Journal of Alloys and Compounds 01/2012; 512:316-322. · 2.29 Impact Factor -
Article: Role of Cr3+ ions on the microstructure development, and magnetic phase evolution of Ni0.7Zn0.3Fe2O4 ferrite nanoparticles
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ABSTRACT: A series of ferrite samples with the chemical formula Ni0.7Zn0.3CrxFe2−xO4 (x = 0.0–0.5) were prepared by a sol–gel auto-combustion method and annealed at 600 ◦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 Cr3+ 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 Cr3+ content. However, coercivity increases with increasing Cr3+ substitution. The magnetic moments calculated from Neel’s molecular-field model are in agreement in the experiment results. The initial permeability (�i) decreases with increasing Cr3+ substitution. The decrease in initial permeability (�i) is attributed to decrease in magnetization on addition of Cr3+. The real part of the permeability decreases gradually with increasing frequency in accordance with Snoek’s law. The Curie temperature decreases linearly with increasing Cr3+ content.Journal of Alloys and Compounds 01/2012; 512:316-322. · 2.29 Impact Factor
