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Mg–Cu–Zn Ferrites for Multilayer Inductors
Author(s) -
Mürbe Julia,
Töpfer Jörg
Publication year - 2007
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.1744-7402.2007.02163.x
Subject(s) - materials science , sintering , coprecipitation , microstructure , ferrite (magnet) , permeability (electromagnetism) , shrinkage , curie temperature , inductor , composite material , metallurgy , chemical engineering , ferromagnetism , electrical engineering , physics , quantum mechanics , voltage , membrane , biology , engineering , genetics
Mg–Cu–Zn ferrites can be sintered at T ≤950°C to sufficient density and display adequate permeability profiles for application in multilayer ferrite inductors. The permeability and Curie temperature have to be optimized by proper selection of composition. Ferrites with <50 mol% Fe 2 O 3 reveal enhanced densification behavior. Submicrometer powders prepared by fine milling show good sintering activity and density after firing at 900°C. Nano‐size ferrite powders prepared by coprecipitation or flame synthesis lead to high density; maximum shrinkage already occurs at T <800°C. The use of Bi 2 O 3 as a sintering additive further improves the densification, but also affects the microstructure and, hence, the permeability. A maximum permeability of μ i =450–500 is obtained.