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Title: On the Coercivity of the Bi-Doped Ba-Hexaferrite, BaFe12-xBixO19
Authors: Tanakorn Osotchan
Keywords: Hexaferrites;bismuth doping;coercive force
Issue Date: 1999
Publisher: Thammasat University
Citation: Thammasat Int. J. Sc. Tech. 1999;4(3):54-58.
Abstract: The changes in the coercivity and the saturation magnetization Ms of M-type Ba hexaferrites (Ba-F) due to the addition of the sintering aid Bi2O3 are studied. It is found that the coercive force HC of BaFc 12-xBixO19 decreases monotonically up to a doping level of x = 0.8 and that for a fixed Bi3+ content, HC decreases as the sintering temperature Ta is increased. After and initial increase, Ms is seen to decrease with increasing Bi substitution. The decrease in the coercivity can be due to two possible causes, a decrease in the grain size or a lessening of the uniaxial anisotropy. The second explanation requires the Bi3+ to enter into the 4e sites. This would lead to the saturation magnetization decreasing with increased Bi substitution.
ISSN: 0859-4074
Appears in Collections:Physics: National Journal Publications

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