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Effect of Ni-Zr codoping on dielectric and magnetic properties of SrFe12O19 via sol-gel route

Kuruva, Praveena and Matli, Penchal Reddy and Mohammad, Bououdina and Reddigari, Sandhya and Katlakunta, Sadhana (2015) Effect of Ni-Zr codoping on dielectric and magnetic properties of SrFe12O19 via sol-gel route. In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 382 . pp. 172-178.

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Official URL: http://dx.doi.org/10.1016/j.jmmm.2015.01.050


Nanocrystalline strontium hexaferrites SrFe12-2x (Ni2+-Zr4+)(x)O-19] nanoparticles were successfully synthesized by sal gel process. For densification the powders were sintered at 950 degrees C/4 h. The sintered samples were characterized by X-ray diffraction (XRD), surface area measurement, and field emission scanning electron microscope (FESEM). The lattice parameter a is almost constant but c increased with x upto 0.8 and then decreased. The frequency dependent complex permittivity (epsilon and epsilon `' and permeability (mu' and mu `') and magnetic properties such as saturation magnetization (M-s), coercive field (H-c) were studied. If is observed that saturation magnetization increased gradually from 57.82 emuig to 67.2 emufg as x increased from 0.2 to 0.4 and then decreased from 672 emufg to 31.63 ernufg for x=1.0. In present study, x=0.4 shows high value of M-s 67.2 emu/g. The real part of permittivity (epsilon') remains constant upto a frequency 1 GHz and increases further with an increase of frequency, a resonance and anti resonance peak was observed above 1 GHz for all the samples. In real part of permeability (mu') the relaxation frequency is observed above 1 GHz for all the samples and it is attributed to the domain wall motion. It is well known that the permeability for polycrystalline ferrites can be described as the superposition of two different magnetizing mechanisms: spin rotation and domain wall motion. These low coercive strontium hexaferrites are suitable for magnetic recording applications in hard disks, floppy disks, video tapes, etc. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords: Magnetic materials; Hexaferrites; Sol gel route; Dielectric properties; Magnetic properties
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 21 Apr 2015 07:49
Last Modified: 21 Apr 2015 07:49
URI: http://eprints.iisc.ac.in/id/eprint/51349

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