DocumentCode :
1475078
Title :
Low-Temperature Firing of Substituted M-Type Hexagonal Ferrites for Multilayer Inductors
Author :
Bierlich, Silvia ; Töpfer, Jörg
Author_Institution :
Dept. of SciTec, Univ. of Appl. Sci., Jena, Germany
Volume :
48
Issue :
4
fYear :
2012
fDate :
4/1/2012 12:00:00 AM
Firstpage :
1556
Lastpage :
1559
Abstract :
Co/Ti-substituted M-type BaFe12-2xCoxTixO19 ferrites were investigated for multilayer inductor applications. Single-phase ferrite powders were prepared at 1000°C through the mixed oxide route. After sintering at 1300°C a maximum permeability of μ´ = 37 is observed for x = 1.2. The addition of a glass sintering aid shifts the temperature of maximum shrinkage down to below 900°C and dense samples were obtained after firing at 900°C. For ferrites with x = 1.2 a permeability of μ´ = 13 and a resonance frequency of 1 GHz is observed. Contrary to substituted Zand Y-type hexagonal ferrites, the Co/Ti-substituted M-type ferrites are stable during co-firing at 900°C and show no sign of thermal decomposition, i.e., these materials are compatible with the low-temperature ceramic cofiring (LTCC) technology. It is shown that Co/Ti-M-type ferrites are excellent magnetic materials for multilayer inductors.
Keywords :
barium compounds; ferrites; firing (materials); magnetic particles; magnetic permeability; sintering; BaFe12-2xCoxTixO19; glass sintering; low-temperature firing; magnetic materials; magnetic permeability; multilayer inductors; permeability; resonance frequency; single-phase ferrite powders; substituted M-type hexagonal ferrites; temperature 1000 degC; temperature 1300 degC; temperature 900 degC; Additives; Ferrites; Glass; Inductors; Nonhomogeneous media; Permeability; Powders; Hexagonal ferrites; multilayer inductors; permeability; sintering behavior;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2011.2172682
Filename :
6172393
Link To Document :
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