Magnetic Properties of Highly Permeable MnZn Ferrites with Addition of Phosphorous Pentoxide

Abstract:

The effects of phosphorous pentoxide on the properties of highly permeable MnZn ferrites have been investigated in this study. It was found that P₂O₅ addition had a pronounced effect on promoting crystalline grain growth. At the same time, porosity had an initial decrease followed by a subsequent increase with the increase of P₂O₅ content. Consequently, the initial permeability first increased, and then gradually decreased. Magnetic loss of the samples was also influenced by both grain size and porosity. With 0.06wt% P₂O₅ addition, the initial permeability reached to the maximum and the magnetic loss declined to the least. Porosity was the dominating factor to determine the η_B (hysteresis material constant) property of the ferrites. With 0.04wt% P₂O₅ addition, porosity decreased to its bottom, accordingly, the η_B value decreased to the least. Synthetically considering high initial permeability, low η_B value and good permeability frequency characteristic, the content of P₂O₅ addition had better be kept at 0.04wt%.

• Periodical: Materials Science Forum (Volume 687)
• Pages: 129-132
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.687.129
• Online since: June 2011
• Authors: Hua Su, Dainan Zhang, Xiao Li Tang, Bao Yuan Liu
• Keywords: Grain Size, Initial Permeability, P₂O₅ Addition, Porosity, η_B Value

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