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Synthesis and Magnetic Properties of BaFe _{12- {\rm x}} Al _{\rm x} O _{19} Nanopowders

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3 Author(s)
Moon, K.W. ; Dept. of Metall. & Mater. Eng., Hanyang Univ., Ansan, South Korea ; Jeon, K.W. ; Kim, J.

The effect of Al contents on the magnetic properties of Ba hexaferrite powders has been investigated in order to increase the coercivity. In this study, a self-propagating combustion method has been developed to form Ba hexaferrite nanopowders. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis showed that nanopowders with a size of 40-60 nm were successfully produced. With increasing Al contents, the coercivity of the nanopowders increased until the powders had a magnetoplumbite structure. We obtained a coercivity of 7559 Oe in BaFe10Al2O19 powders calcined at 850deg for 1 h.

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Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 10 )