Table of Contents
Physics Research International
Volume 2014 (2014), Article ID 672739, 11 pages
http://dx.doi.org/10.1155/2014/672739
Research Article

Structural and Electrical Properties of Li–Ni Nanoferrites Synthesised by Citrate Gel Autocombustion Method

1Department of Physics, Osmania University, Hyderabad, Telangana 500007, India
2Department of Physics, University College of Science, Osmania University, Saifabad, Telangana 500044, India

Received 9 July 2014; Revised 19 September 2014; Accepted 21 September 2014; Published 20 October 2014

Academic Editor: Israel Felner

Copyright © 2014 G. Aravind et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An attempt has been made to synthesize nanocrystalline lithium-nickel ferrites with a compositional formula Li0.5−0.5xNixFe2.5−0.5xO4 (where to 1.0 with step of 0.2) by a low temperature citrate gel autocombustion method. Single phase cubic structure is confirmed by X-ray diffraction analysis. This result demonstrates that the prepared samples are homogeneous and the sharp peaks reveal that the samples are in good crystalline form. As the Ni concentration is increased, various interesting changes in the values of the structural parameters like lattice parameter, X-ray density, bulk density, and porosity have been observed. The surface morphology of the prepared samples was studied using scanning electron microscopy (SEM). The DC resistivity measurements were carried out using two-probe method from 200°C to 600°C. The variation of with reciprocal of temperature shows a discontinuity at Curie temperature. versus plot of the pure lithium ferrites is almost linear which indicates the Curie temperature of the pure lithium ferrites was beyond our measured temperature. The dielectric properties of these ferrites have been studied using a LCR meter from the room temperature to 700 K at various frequencies up to 5 MHz, which reveals that all the prepared samples have dielectric transition temperature around 600 K.