Preparation, characterizations and magnetic properties of doped barium hexaferrites BaFe sub(12-2x)Mn sub(x) Sn sub(x)O sub(19) (x = 0.0-1.0)

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 27; no. 3; pp. 507 - 511
• Main Authors: Wang, Jingping, Wu, Chunli, Xia, Tian, Liu, Ying, Feng, Jing, Zhang, Milin
• Format: Journal Article
• Language: English
• Published: 01.06.2012
• Subjects: Barium compounds; Barium hexaferrite; Coercive force; Coercivity; Ferrites; Magnetic properties; Manganese; Tin
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-012-0493-4

A series of doped barium hexaferrites BaFe sub(12-2x)Mn sub(x)Sn sub( x)O sub(19) (x = 0.0-1.0) particles were prepared by the co-precipitation/molten salt method. The particle size and crystalline of the samples BaFe sub(12-2x)Mn sub(x)Sn sub(x)O sub(19) decrease with an increase in the doping amount x. When x is less than 0.8, the pure BaFe sub(12-2x)Mn sub(x)Sn sub(x)O sub(19) particles with hexagonal plate morphology are obtained. The effects of substitution on magnetic properties were evaluated and compared to nomal BaFe sub(12)O sub(19). The specific magnetizations (M sub(s)) of doped materials have been significantly improved. Among all these compositions, the BaFe sub(10.4)Mn sub(0.8)Sn sub(0.8)O sub(19) sample has the highest M sub(s) value of 81.8 A.m super(2).kg super(-1) at room temperature and its intrinsic coercivity (H sub(c)) is 44.5 kA.m super(-1). The as-prepared doped barium ferrites exhibit a low temperature coefficient of coercivity close to zero. The coercivity is independent of temperature when x is in the a range 0.5-0.7.