The effect of Nb sub 2O sub 5 dopant on the structural and magnetic properties of MnZn-ferrites

In the present work, the role of Nb sub 2O sub 5 additions on the structural and electromagnetic properties of MnZn-ferrites has been investigated. Nb sub 2 O sub 5 additions at a concentration of about 200 ppm are found to lower the losses by almost 17%. At higher concentrations Nb sub 2O sub 5 seg...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2002-09, Vol.250, p.98-109
Main Authors: Zaspalis, V T, Antoniadis, E, Papazoglou, E, Tsakaloudi, V, Nalbandian, L, Sikalidis, C A
Format: Article
Language:English
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Summary:In the present work, the role of Nb sub 2O sub 5 additions on the structural and electromagnetic properties of MnZn-ferrites has been investigated. Nb sub 2 O sub 5 additions at a concentration of about 200 ppm are found to lower the losses by almost 17%. At higher concentrations Nb sub 2O sub 5 segregates at the grain boundaries, promotes grain growth and affects negatively the microstructure development. At concentrations up to 200 ppm, where a gradual improvement of the magnetic properties is observed, Nb sub 2O sub 5 is found to precipitate together with CaO homogeneously along the grain boundaries and participates in the formation of glassy phases. Those phases act as buffers between the grains, smoothening the transition from one grain to the other. Moreover they also reduce Zn-evaporation at the grain boundary area. Both effects are in favour of low electromagnetic power losses and of high relative magnetic permeabilities. 2002 Elsevier Science B.V. All rights reserved.
ISSN:0304-8853