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Advances in Condensed Matter PhysicsVolume 2008 2008, Article ID 703479, 7 pages

Research Article

P. G. Department of Applied Physics, S.D. College, Ambala Cantt 133 001, India

Department of Physics, Maharshi Dayanand University, Rohtak 124 001, India

UGC-DAE, Consortium for Scientific Research, Khandwa Road, Indore 452 017, India

Received 13 June 2008; Revised 30 September 2008; Accepted 31 December 2008

Academic Editor: R. N. P. Choudhary

Copyright © 2008 R. L. Dhiman 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

Aluminum doped manganese ferrites with have been prepared by the double ceramic route. The formation of mixed spinel phase has been confirmed by X-ray diffraction analysis. The unit cell parameter `- is found to decrease linearly with aluminum concentration due to smaller ionic radius of aluminum. The cation distributions were estimated from X-ray diffraction intensities of various planes. The theoretical lattice parameter, X-ray density, oxygen positional parameter, ionic radii, jump length, and bonds and edges lengths of the tetrahedral A and octahedral B sites were determined.

Fe Mössbauer spectra recorded at room temperature were fitted with two sextets corresponding to Fe

ions at A- and B-sites. In the present ferrite system, the area ratio of Fe

ions at the A- and B-sites determined from the spectral analysis of Mössbauer spectra gives evidence that Al

ions replace iron ions at B-sites. This change in the site preference reflects an abrupt change in magnetic hyperfine fields at A- and B-sites as aluminum concentration increases, which has been explained on the basis of supertransferred hyperfine field. On the basis of estimated cation distribution, it is concluded that aluminum doped manganese ferrites exhibit a 55% normal spinel structure.





Autor: R. L. Dhiman, S. P. Taneja, and V. R. Reddy

Fuente: https://www.hindawi.com/



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