Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 7, Pages 814-818Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.11.009
Keywords
Co-precipitation/molten salt method; Barium ferrite; Doping; Saturation magnetization; Coercivity
Funding
- Shenyang Normal University
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A series of powders of M-typed barium hexaferrites doped with Co, Zn and Sn of general formula BaFe12-2xCox/2Znx/2SnxO19(x=0-2.0) were prepared by the co-precipitation/molten salt method. The structures, particle morphology and magnetic properties of the products were characterized by X-ray powder diffraction, vibrating sample magnetometer and ESEM/EDX. The results show that the crystallinity of the samples decreases with increase in the doping amount x. When x is less than 0.6, it is possible to obtain perfectly crystallized hexagonal BaFe12-2xCox/2Znx/2SnxO19, where the diameters of the particles are around 500 nm. The saturation magnetization of pure barium ferrite BaFe12O19 produced with this method is 71.9 A m(2) kg(-1) at room temperature and the intrinsic coercivity (Hc) is 367.8 k A m(-1). The doped barium hexaferrite powder obtained when x is between 0.3 and 0.4 exhibits high saturation magnetization and a temperature dependence of coercivity close to zero. (C) 2009 Elsevier B.V. All rights reserved.
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