Notice of RetractionEffect of Cu Substitution on Ni-Zn Ferrite by Microwave Hydrothermal Method

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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The effect of copper substitution on structure and magnetic properties in Ni_0.5-xZn_0.5Cu_xFe₂O₄ (where x =0.0, 0.1, 0.2, 0.3, 0.4) samples synthesized by microwave hydrothermal method is discussed in this paper. XRD patterns of powder samples show the cubic spinel phase up to x=0.3 and a second phase of composition Fe₂O₄ can be detected when x=0.4. The average crystallite size of the powder is in the range 8.5~10.3nm. And lattice parameter is found to increase with the addition of copper. VSM reveals that Cu²⁺ substitution is adverse to the saturation magnetization. Besides, the v1 shifts to the lower frequency when Cu²⁺ substitution is observed in FT-IR.