Dielectric study of non-stoichiometric spinel-ferrite ceramics with grain-boundary barrier layers

High density ceramic ferrites of the NiZn family were carefully prepared. A subsequent impregnation process yielded a dielectric with grain-boundary barrier layers which was quite insulating. An investigation of the dielectric properties over a wide frequency range showed the presence of a relaxati...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 1991-05, Vol.8 (2), p.145-151
Main Authors: Largeteau, A., Ravez, J., Jacobs, I.S.
Format: Article
Language:English
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Summary:High density ceramic ferrites of the NiZn family were carefully prepared. A subsequent impregnation process yielded a dielectric with grain-boundary barrier layers which was quite insulating. An investigation of the dielectric properties over a wide frequency range showed the presence of a relaxation. The values of permittivity and the characteristics of the relaxation were correlated with impregnation process parameters such as the amount of impregnation material and the temperatures and times of impregnation. The relaxation is well described by a Cole-Cole model, and the magnitudes of the static permittivity are closely coupled to the resistivities.
ISSN:0921-5107
1873-4944
DOI:10.1016/0921-5107(91)90028-T