Ceramic ferrites with grain boundary barrier layers: Role of grain composition on dielectric properties

Ceramic Ni-Zn spinel have been prepared with iron varying from less than to more than the stoichiometric proportion, and thus with a wide range of resistives. Intergranular insulation has been achieved through penetration into the grain boundaries of an impregnation mixture (grain boundary barrier l...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 1990-05, Vol.6 (1), p.33-36
Main Authors: Largeteau, A., Ravez, J., Jacobs, I.S.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Permittivity (dielectric function)
Physics
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Summary:Ceramic Ni-Zn spinel have been prepared with iron varying from less than to more than the stoichiometric proportion, and thus with a wide range of resistives. Intergranular insulation has been achieved through penetration into the grain boundaries of an impregnation mixture (grain boundary barrier layer). Magnetic analyses, both thermomagnetic and high frequency, show that the impregnation has little, if any, effect on the grain composition. The frequency dependence of the permittivities reveals different behaviours varying with composition: samples with excess iron exhibit a dielectric relaxation in contrast to samples which are stoichiometric or deficient in iron.
ISSN:0921-5107
1873-4944
DOI:10.1016/0921-5107(90)90111-N