Effect of Oxygen Content during Sintering on the Losses of MnZn Ferrites

Abstract:

The magnetic properties of MnZn ferrites are highly influenced by the partial oxygen pressure during sintering. In this work MnZn ferrites with different chemical compositions were pressed in a toroidal form and sintered at 1290 °C for 6 h at different oxygen pressures. X ray diffraction using K-edge radiation of Fe, Zn and Mn were performed in order to identify the atomic preference in the MnZn ferrite spinel structure, by means of Rietveld analysis. Magnetic losses were measured at 25 °C and 100 °C (200mT, 100 kHz). The high temperature loss decreased with the increase of oxygen content during sintering whereas at room temperature this effect was opposite. The losses behavior as function of frequency was analyzed according the loss separation model.

• Periodical: Materials Science Forum (Volumes 775-776)
• Pages: 404-409
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.775-776.404
• Online since: January 2014
• Authors: Susilene Real Janasi, Victoria A. Lázaro-Colán, Fernando J.G. Landgraf, Marcos Flavio de Campos
• Keywords: Diffusion Coefficients, Magnetic Loss, Magnets, MnZn Ferrite, Sintering

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