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Soft Ferrite Materials for Multilayer Inductors

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Various families of soft ferrites (Ni–Cu–Zn; Mg–Cu–Zn; Co2–Z; Mn–Zn) with a sintering temperature of T≤950°C are used for multilayer inductors. It is shown for Ni–Cu–Zn and Mg–Cu–Zn ferrites that composition, powder particle size, and sintering additive concentration strongly affect the shrinkage, sintering behavior, microstructure, and magnetic properties. A maximum permeability of i=700–900 is observed with a Bi2O3 addition of about 0.5 wt%. The maximum shrinkage can be shifted down to 700°C using nanosize powders. Z-type hexaferrites with a permeability of 10 are used for high-frequency applications up to 2 GHz.

Document Type: Research Article


Affiliations: 1: Department SciTec, University of Applied Science Jena, 07745 Jena, Germany 2: Hermsdorfer Institut für Technische Keramik, 07629 Hermsdorf, Germany 3: VIA electronic GmbH, 07629 Hermsdorf, Germany

Publication date: November 1, 2006


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