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Magnetic properties of Cr3+ substituted BaFe12O19 powders grown by a sol-gel method

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5 Author(s)
Kim, Chul Sung ; Dept. of Phys., Kookmin Univ., Seoul, South Korea ; An, Sung Yong ; Ji Hee Son ; Lee, Jae-Gwang
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Cr3+ substituted Ba-hexaferrite was fabricated by a sol-gel method. The crystallographic and magnetic properties of BaFe12-xCrxO19 (0⩽x⩽7) were investigated XRD, Rutherford backscattering spectrometry, vibrating sample magnetometry and Mossbauer spectroscopy. The crystal structure was found to be magnetoplumbite, typical of M-type hexagonal ferrite. By substituting Fe3+ in BaFe12O19 by Cr 3+, we have been able to attribute the Mossbauer parameters to the 5 crystallographic sites of the structure. Only the octahedral sublattices were occupied by Cr ions. The isomer shifts indicate that the valence state of the Fe ions was Fe3+. The Curie temperatures of BaFe12-xCrxO19 decreased linearly increasing Cr-substitution, at a rate of 55 K/Cr atom

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )