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High Q ‐factor NiCuZn ferrite with nanocrystalline ferrite particles and Co 2 O 3 additives
Author(s) -
Su Hua,
Zhang Huaiwu,
Tang Xiaoli,
Liu Baoyuan,
Jin Yulan
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622322
Subject(s) - nanocrystalline material , ferrite (magnet) , materials science , sintering , beta ferrite , metallurgy , chemical engineering , composite material , microstructure , nanotechnology , austenite , engineering
This work focuses on the effects of nanocrystalline ferrite particles (NFPs) on the sintering behaviour and magnetic properties of NiCuZn ferrite for multilayer chip inductor use. It was found that the NFPs could evidently improve the sintering behaviour of the ferrite because of their large surface free energy. Because the NFPs had the same chemical composition as the NiCuZn ferrite, samples with appropriate NFPs added could show better magnetic properties than samples with added Bi 2 O 3 . Also, to further increase the Q ‐factor of the NiCuZn ferrite, the effects of Co 2 O 3 additive on the magnetic properties of the NFP‐added ferrite were studied. The results revealed that the permeability of the ferrite decreased monotonically due to added Co 2 O 3 ; the Q ‐factor first increased and reached its peak with 0.2 wt% Co 2 O 3 added, whereupon it began to decrease. With 30 wt% NFPs and 0.2 wt% Co 2 O 3 additives, the NiCuZn ferrite showed a high Q ‐factor of more than 200. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)