Preparation, thermal stability and permeability behaviour of Z-type hexagonal ferrites for multilayer inductors Online publication date: Sat, 28-Feb-2015
by Silvia Kracunovska, Jorg Topfer
International Journal of Materials and Product Technology (IJMPT), Vol. 40, No. 1/2, 2011
Abstract: Co2Z hexaferrite Ba3Co2Fe24O41 with iron excess Ba3Co2−xFe24+xO41 (0 ≤ x ≤ 0.8) and deficiency Ba3Co2+yFe24−yO41 (0 ≤ y ≤ 0.6) were prepared by a mixed oxalate co-precipitation route and the standard ceramic technology. XRD studies showed that both synthesis routes lead to an almost single phase Z-type ferrites for x = 0 after calcination and sintering at 1330°C. For iron deficient samples, 0 ≤ y ≤ 0.6, the multi-phase mixtures were observed. The permeability of Z-type ferrites varied with composition x. The maximum permeability of μ' = 37 was observed for the sample with x = 0.6. Addition of Bi2O3 as sintering aid shifts the temperature of maximum shrinkage to lower temperatures and dense samples were obtained after sintering at 950°C. However, the permeability is only μ' = 3. It is shown here that Co2Z ferrites are not stable under 1300°C and that partial thermal decomposition causes a reduction of the permeability.
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