High permeability-high frequency stable MnZn ferrites

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• 作者：J. Kalarus^a ; G. Kogias^b ; ^c ; ^{kogias@cperi.certh.gr} ; D. Holz^a ; V.T. Zaspalis^b ; ^c
• 关键词：MnZn ferrites ; Permeability ; Losses ; Sintering
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：September, 2012
• 卷：324
• 期：18
• 页码：2788-2794
• 文件大小：776 K

摘要

Modern MnZn ferrite applications require high magnetic initial permeability and exceptional frequency stability; the former implies large grains, while the latter high grain boundary resistivity. In this article the optimization of the final firing process is described for achieving both. The optimization is based on the homogeneous dissolution of dopants under oxidative conditions and their subsequent precipitation along grain boundaries. This was accomplished by integrating isothermal plateaus at the upper stadia of the cooling stage of the final firing process. MnZn ferrites of the basic composition were synthesized with initial permeability (measured at f=10 kHz, B<0.1 mT, T=25 掳C) 12,600 and losses, expressed as tan(未)/渭_i, of 3.1脳10^鈭? at 10 kHz and 20.5脳10^鈭? at 100 kHz (B<0.1 mT, T=25 掳C), that reflect good frequency stability. These results could be reproduced in pilot production scale.