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Magnetic and dielectric interactions in nano zinc ferrite powder: Prepared by self-sustainable propellant chemistry technique

Prasad, BDaruka and Nagabhushana, H and Thyagarajan, KV and Nagabhushana, BM and Jnaneshwara, DM and Sharma, SC and Shivakumara, C and Gopal, NO and Ke, Shyue-Chu and Chakradhar, RPS (2014) Magnetic and dielectric interactions in nano zinc ferrite powder: Prepared by self-sustainable propellant chemistry technique. In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 358 . pp. 132-141.

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Official URL: http://dx.doi.org/ 10.1016/j.jmmm.2014.01.021

Abstract

The structural, magnetic and dielectric properties of nano zinc ferrite prepared by the propellant chemistry technique are studied. The PXRD measurement at room temperature reveal that the compound is in cubic spinel phase, belong to the space group Fd (3) over barm. The unit cell parameters have been estimated from Rietveld refinement. The calculated force constants from FTIR spectrum corresponding to octahedral and tetrahedral sites at 375 and 542 cm(-1) are 6.61 x 10(2) and 3.77 x 10(2) N m(-1) respectively; these values are slightly higher compared to the other ferrite systems. Magnetic hysteresis and EPR spectra show superparamagnetic property nearly to room temperature due to comparison values between magnetic anisotropy energy and the thermal energy. The calculated values of saturation magnetization, remenant magnetization, coercive field and magnetic moment supports for the existence of multi domain particles in the sample. The temperature dependent magnetic field shows the spin freezing state at 30 K and the blocking temperature at above room temperature. The frequency dependent dielectric interactions show the variation of dielectric constant, dielectric loss and impedance as similar to other ferrite systems. The AC conductivity in the prepared sample is due to the presence of electrons, holes and polarons. The synthesized material is suitable for nano-electronics and biomedical applications. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the ELSEVIER SCIENCE BV, NETHERLANDS
Keywords: Magnetic nanoparticle; Superparamagnetism; Magnetocrystalline anisotropy; Complex permittivity and AC conductivity
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 07 Apr 2014 09:32
Last Modified: 07 Apr 2014 09:32
URI: http://eprints.iisc.ac.in/id/eprint/48811

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