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Electrical and magnetic properties of Ni0.8Zn0.2Fe2O4/silica composite prepared by sol-gel method

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Abstract

Ultrafine Ni0.8Zn0.2Fe2O4 particles dispersed in silica (SiO2) matrix are produced by sol-gel method. The powders were subjected to X-ray diffraction to confirm the formation of crystalline phases. The physical properties such as bulk density, true density, % of porosity and % of linear shrinkage were studied. The magnetic permeability as the function of frequency from 1 kHz to 13 MHz and temperatures from room temperature to 300°C were studied for samples sintered at temperature 1250°C. The AC electrical resistivity as the function of frequency and DC electrical resistivity as the function of temperature were studied. The AC-resistivity of the order of ≥105 Ωcm and DC-resistivity ≥108 Ωcm were obtained at room temperature. Microstructural features of sintered samples show the presence of ferrite grains of 1–2 μm size.

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Authors and Affiliations

  1. Center for Ceramic Technology, Anna University, Chennai, 600 025, India

    R. V. Mangalaraja, P. Manohar & F. D. Gnanam

  2. Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology, 2268-1 Shimo-Shidami, Moriyama-ku, Nagoya, 463-8687, Japan

    M. Awano

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  1. R. V. Mangalaraja
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  2. P. Manohar
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  3. F. D. Gnanam
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  4. M. Awano
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Correspondence to R. V. Mangalaraja.

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Mangalaraja, R.V., Manohar, P., Gnanam, F.D. et al. Electrical and magnetic properties of Ni0.8Zn0.2Fe2O4/silica composite prepared by sol-gel method. Journal of Materials Science 39, 2037–2042 (2004). https://doi.org/10.1023/B:JMSC.0000017766.07079.80

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  • DOI: https://doi.org/10.1023/B:JMSC.0000017766.07079.80

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