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ISRN Condensed Matter Physics
Volume 2012 (2012), Article ID 907257, 9 pages
http://dx.doi.org/10.5402/2012/907257
Research Article

IR Spectra, Elastic and Dielectric Properties of Li–Mn Ferrite

Magnetic Semiconductor Laboratory, Physics Department, Faculty of Science, Zagazig University, Zagazig, Egypt

Received 13 August 2012; Accepted 6 September 2012

Academic Editors: A. N. Kocharian and H.-D. Yang

Copyright © 2012 S. A. Mazen and N. I. Abu-Elsaad. 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

Polycrystalline ferrites, , (where and ), were prepared by using ceramic method. Single phase cubic structure was confirmed by X-ray diffractometer. The lattice parameter “a” was found to increase with increasing ion substitution. IR spectra of the samples were recorded from 200 to 1000 cm−1. The two primary bands corresponding to tetrahedral and octahedral were observed at about 575 cm−1 and 370 cm−1, respectively. Elastic properties of these mixed ferrites were estimated as a function of composition. Young's modulus , rigidity modulus , bulk modulus , Debye temperature ( ), and mean sound velocity ( ) were calculated from the transverse ( ) and longitudinal ( ) wave velocities. The variation of elastic moduli with composition was interpreted in terms of binding forces between the atoms of spinel lattice. AC conductivity and dielectric properties of the samples were measured at room temperature over 100 Hz–1 MHz. The electrical conduction mechanism could be explained with the electron hopping model. Frequency exponential factor was calculated and it was found between 0.4 and 0.8.