首页|CO_2Z, CO_2Y and CoM-Type Hexagonal Ferrites for Multilayer Inductors
CO_2Z, CO_2Y and CoM-Type Hexagonal Ferrites for Multilayer Inductors
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Trans Tech Publications Ltd
Hexagonal Co-containing Z-; Y- and M-type ferrites are used as soft magnetic materials for multilayer inductors for operating frequencies up to 3 GHz. CO_2Z-type Ba_3CO_2Fe_(24)O_(41), iron excess Ba_3CO_(2-y)Fe_(24+y)O_(41) (0≤ y ≤ 0.8) and Ba_3CO_(2-)Cu_xFe_(24)O_(41) (0 ≤ x ≤ 1.0) ferrites have their stability intervals between 1260-1350℃. The permeability of a ferrite with y = 0.6 sintered at 1300℃ is u = 30 throughout the MHz. Addition of Bi_2O_3 shifts the maximum shrinkage down to 950℃. Their permeability is μ = 5 because of partial decomposition of the CO_2Z phase. Y-type ferrite Ba_2Co_(1.2-x)Zn_xCu_(0.8)Fe_(12)O_(22) (x = 1.2) sintered at 1100℃ shows a permeability of μ = 20. Sintering at 900℃ reduces the permeability to μ = 10. M-type BaCo_(1.2)Ti_(1.2)Fe_(9.6)O_(19) ferrites sintered at 970℃ display a permeability of μ = 35.
S. Kracunovska、J. Toepfer
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University of Applied Sciences Jena, Dept. SciTec, Carl-Zeiss-Promenade 2, 07745 Jena, Germany
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NSTL
Trans Tech Publications Ltd
