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This article has been retracted as it is found to contain a substantial amount of material from the paper “Studies on AC and DC electrical conductivity and thermo-electric power of NiMgCuZn ferrites” already published in International Journal of Nanoparticles, Vol. 3, No. 4, 2010, pp. 349-366.

View the full Retraction here.


  1. M. Venkata Ramana, N. Ramamanohar Reddy, and K. V. Siva Kumar, “Influence of magnesium substitution on thermal and electrical properties of NiCuZn ferrites for microinductor core applications,” Physics Research International, vol. 2012, Article ID 861690, 8 pages, 2012.
Physics Research International
Volume 2012, Article ID 861690, 8 pages
Research Article

Influence of Magnesium Substitution on Thermal and Electrical Properties of NiCuZn Ferrites for Microinductor Core Applications

1Nanotechnology Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Tamil Nadu, Chennai 600 036, India
2Ceramic Composite Materials Laboratory, Department of Physics, Sri Krishnadevaraya University, Ananthapur 505 003, India

Received 22 July 2011; Revised 7 January 2012; Accepted 12 January 2012

Academic Editor: Arcady Zhukov

Copyright © 2012 M. Venkata Ramana 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.


Two series of NiMgCuZn ferrites, that is, (1) NixMg0.6−xCu0.1Zn0.3Fe2O4 and sample G: Ni0.3Mg0.3−yCu0.1Zn0.5−yFe2O4 with , 0.1, 0.2, 0.3 and (2) NixMg0.6−xCu0.1Zn0.3Fe2O4 with , 0.1, 0.2 were synthesized and prepared by conventional ceramic double-sintering process and to use them as core materials for microinductor applications. The formation of single phase was confirmed by X-ray diffraction. The temperature and compositional variation of DC, AC electrical conductivities (σ) and thermoelectric power were studied on these two series of polycrystalline ferrospinels. The studies were carried out in wide range of temperature from 30 to 350°C. On the basis of thermoelectric study, the ferrites under present work were found to be shown as n-type and p-type transition. The electrical conduction in these ferrospinels is explained in the light of polaron hopping mechanism. These ferrite compositions have been developed for their use as core materials for microinductor applications.