Title :
Effect of oxidation degree on electromagnetic properties of Mn-Zn ferrite
Author :
Suh, J.J. ; Han, Y.H. ; Shin, M.S. ; Song, B.M.
Author_Institution :
Sungkyunkwan Univ., Suwon, South Korea
fDate :
9/1/1999 12:00:00 AM
Abstract :
The effect of oxygen partial pressure during sintering process on the electromagnetic properties of Mn-Zn ferrites has been studied. Equilibrium oxygen partial pressure was precisely controlled according to log Po2=A-14540/T(K). At low oxygen partial pressure, significant Zn volatilization as well as loss of oxygen was observed. As the oxygen parameter (A) decreased from 8.2 to 7.6, the power loss minimum and the second maximum of initial permeability moved to lower temperatures. These shifts were not clearly observed with oxygen parameters below 7.6. The core sintered at A=7.0 showed the prominent second permeability peak
Keywords :
ceramics; ferrites; magnetic leakage; magnetic permeability; manganese compounds; oxidation; sintering; stoichiometry; zinc compounds; Mn-Zn ferrite; MnZnFe2O4; Zn volatilization; electromagnetic properties; equilibrium oxygen partial pressure; initial permeability; oxidation; oxygen partial pressure; power loss minimum; second permeability peak; sintering; Atmosphere; Ceramics; Conductivity; Cooling; Ferrites; Oxidation; Permeability; Pressure control; Temperature control; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
