Cover Page April-2013, Current Issue-Advanced Materials Letters

Advanced Materials Letters

Volume 4, Issue 4, Pages 310-316, April 2013, Current Issue
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Mossbauer, Magnetic, Dielectric And Dc conductivity Of Al3+ ions Substituted Mg-Mn-Ni nano Ferrite Synthesized By Citrate Precursor method

Satish Verma1 *, Jagdish Chand1, M. Singh2

1Department of Physics Govt. P.G. College Solan 173212, India

2Department of Physics Himachal Pradesh University, Summer-Hill, Shimla 171005, India

Adv. Mater. Lett., 2013, Current Issue, 4 (4), pp 310-316

DOI: 10.5185/amlett.2012.8410

Publication Date (Web): Feb 17, 2013

E-mail: satish_apur@yahoo.com

Abstract

Nanocrystalline Al3+ ions doped Mg0.2Mn0.5Ni0.3AlyFe2-yO4 compositions, where y=0.0, 0.05 and 0.10 have been synthesized by citrate precursor method. The X-ray diffraction (XRD) revealed that the ferrite has single phase cubic spinel structure. The calculated particle size from XRD data have been verified using transmission electron microscopy (TEM). TEM photographs show that the ferrite powders consist of nanometer-sized particle. It was observed that the particle size decreases as the non-magnetic Al content increases. A decrease in lattice parameter and saturation magnetization with increase in aluminium concentration was attributed to smaller ionic radius and weakening of exchange interaction. Dependence of Mössbauer parameters such as isomer shift, quadrupole splitting and hyperfine magnetic field on Al3+ ions concentration have been discussed. Initial permeability ‘µi’, relative loss factor (RLF), saturation magnetization and remanent magnetization decreases with increasing substitution of Al3+ ions. The dielectric constant and dielectric loss decreases with increase in non magnetic Al3+ ions. The dielectric constant follows the Maxwell–Wagner interfacial polarization. The electrical conduction in these ferrites is explained on the basis of the hopping mechanism.

Keywords

Mossbauer spectroscopy, initial permeability, dielectric constant, dielectric loss.

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