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Microstructure dependence of the magnetic properties of sintered Ni–Zn ferrites by solid-state reaction doped with V2O3

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Abstract

In order to improve the frequency range operation of Ni–Zn ferrites with the Ni0.7Zn0.3Fe2O4 stoichiometry in this study, they were doped with V2O3 at different concentrations (0, 0.25, 0.50, and 0.75 wt%). The samples were prepared by the solid-state reaction at 1250 °C for 24 h. The content and location of Vanadium in these ferrites allow us to determine its influence on their microstructure and magnetic properties. A single cubic spinel phase with lattice parameter variation was determined by the refinement of X-ray diffraction patterns. This refinement was achieved using the Rietveld method. The lattice parameter presents a slight enhancement with increasing Vanadium content up to 0.50 wt% of V2O3. The increase of intragrain porosity and the segregation of Vanadium at the grain boundary in samples with higher concentration of Vanadium show a narrow grain-size distribution that leads to a resonant character of the magnetic domain wall. A wide grain-size distribution determined in lower concentration of Vanadium results in a mixed resonant-relaxation dispersion. The use of V2O3 as a dopant in Ni–Zn ferrites increases the frequency operation and coercivity, H c, without abruptly degrading the saturation magnetization, M s. We, therefore conclude, that Vanadium may be used as a strong dopant for the preparation of ferrites for any particular high-frequency application.

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Acknowledgements

The authors thank CONACyT for the student fellowships, Grant No. 170588, 129569, and PAPPIT No. IN116903. The authors would like to thank especially to MSc. Leticia Baños, MSc Adriana Tejeda-Cruz, Dr. José Guzmán, and Dr. Gabriel Lara for their assistance in XRD and SEM characterization; and the Instituto de Investigaciones en Materiales-UNAM for the facilities to achieve this research, and the Instituto de Ciencias Nucleares-UNAM.

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Authors and Affiliations

  1. Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Valencia, Burjasot, 46100, Valencia, Spain

    G. Herrera & M. M. Pérez-Moreno

  2. Department of Inorganic Chemistry, University of Valencia, Calle Doctor Moliner, 50, Burjasot, 46100, Valencia, Spain

    G. Herrera

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  1. G. Herrera
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  2. M. M. Pérez-Moreno
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Correspondence to G. Herrera.

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Herrera, G., Pérez-Moreno, M.M. Microstructure dependence of the magnetic properties of sintered Ni–Zn ferrites by solid-state reaction doped with V2O3 . J Mater Sci 47, 1758–1766 (2012). https://doi.org/10.1007/s10853-011-5956-z

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