Relaxation Phenomena of MgCuZn Ferrites

Abstract:

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The decrease of initial relative permeability at 103-106Hz is observed in MgCuZn or MnMgCuZn ferrites. By measuring the temperature dependence of loss factor, the gradual deterioration of initial relative permeability is attributed to a relaxation phenomenon. The relaxation phenomena of MnMgCuZn ferrites occur in the condition of the stoichiometoric composition and the higher sintering temperatures. The activation energies of the relaxation phenomena are calculated to be 0.3-1.0eV. The relaxation times at infinite temperature are calculated to be 10-12-10-16 second. The initial relative permeability of MgCuZn or MnMgCuZn ferrites with the relaxation phenomena is higher than the value calculated from the resonance frequency and Snoek’s limit law.

Info:

Periodical:

Key Engineering Materials (Volumes 421-422)

Edited by:

Tadashi Takenaka, Hajime Haneda, Kazumi Kato, Masasuke Takata and Kazuo Shinozaki

Pages:

521-524

DOI:

10.4028/www.scientific.net/KEM.421-422.521

Citation:

T. Murase and H. Umeda, "Relaxation Phenomena of MgCuZn Ferrites", Key Engineering Materials, Vols. 421-422, pp. 521-524, 2010

Online since:

December 2009

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Price:

$35.00

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