Development of low loss Mn-Zn ferrites having the fine microstructure

Author

Otobe, S. ; Yachi, Y. ; Hashimoto, T. ; Tanimori, T. ; Shigenaga, T. ; Takei, H. ; Hontani, K.

Author_Institution

FDK Corp., Shizuoka, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3409

Lastpage

3411

Abstract

We studied relations between the microstructure and core loss of Mn-Zn ferrites for power supplies. As the results, we found that the lowest core loss was achieved at 100 kHz and 200 mT condition when the average grain size were 15 to 17 μm. Then, we examined the effect of the third element in addition to CaO-SiO₂ on their deposition behavior in the grain boundary and we found the some additives such as Nb₂O₅, Ta₂O₅ and ZrO₂ which reduce the core loss. Further more, by optimizing the sintering condition, we were able to obtain the extremely low loss Mn-Zn ferrite material for power applications

Keywords

crystal microstructure; eddy current losses; ferrites; grain size; manganese compounds; sintering; zinc compounds; (MnZn)Fe₂O₄; 100 kHz; 15 to 17 mum; average grain size; core loss; fine microstructure; grain boundary; low loss Mn-Zn ferrites; lowest core loss; sintering condition; Additives; Ball milling; Core loss; Ferrites; Frequency; Grain boundaries; Magnetic flux density; Magnetic materials; Microstructure; Power supplies;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800540

Filename

800540