Electrical and magnetic properties of Ni0.8Zn 0.2Fe2O4/silica composite prepared by sol-gel method

R. V. Mangalaraja, P. Manohar, F. D. Gnanam, M. Awano

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

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 Ωcmand 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.

Original languageEnglish
Pages (from-to)2037-2042
Number of pages6
JournalJournal of Materials Science
Volume39
Issue number6
DOIs
StatePublished - 15 Mar 2004
Externally publishedYes

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