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Soft Ferrite Materials for Multilayer Inductors
Author(s) -
Töpfer Jörg,
Mürbe Julia,
Angermann Andre,
Kracunovska Silvia,
Barth Stefan,
Bechtold Franz
Publication year - 2006
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2006.02110.x
Subject(s) - materials science , sintering , microstructure , shrinkage , ferrite (magnet) , permeability (electromagnetism) , metallurgy , inductor , particle size , composite material , chemical engineering , electrical engineering , voltage , membrane , biology , genetics , engineering
Various families of soft ferrites (Ni–Cu–Zn; Mg–Cu–Zn; Co 2 –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 μ i =700–900 is observed with a Bi 2 O 3 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.