Magnetic studies of NiSn-substituted barium hexaferrites processed by attrition milling

• Published in: Journal of magnetism and magnetic materials Vol. 270; no. 1; pp. 77 - 83
• Main Authors: González-Angeles, A., Mendoza-Suárez, G., Grusková, A., Tóth, I., Jančárik, V., Papánová, M., Escalante-Garcı́a, J.I.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2004; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Hexagonal ferrites; Machining, milling; Magnetic properties; Magnetic properties and materials; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Magnetically ordered materials: other intrinsic properties; Materials science; Materials synthesis; materials processing; Mossbauer effect; other γ-ray spectroscopy; Mössbauer effect; other γ-ray spectroscopy; Mössbauer spectra; Physics; Saturation moments and magnetic susceptibilities; Substitution effects; 71.20.Ps,75.50,74.25.Ha,75.50.Ss,33.45.+x; Hexagonal ferrites; Substitution effects; Mössbauer spectra; Magnetic properties; Nickel oxides; Moessbauer effect; Powders; Inorganic compounds; Magnetization; Thermomagnetic effects; Transition element compounds; Permanent magnets; XRD; Experimental study; Attrition; Magnetic susceptibility; Tin oxides; Multi-element compounds; 71.20.Ps,75.50,74,25.Ha,75.50.Ss,33.45. + x Hexagonal ferrites; Magnetic anisotropy; Barium oxides; Coercive force
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2003.08.001

BaFe 12−2 x (NiSn) x O 19 compounds were synthesized via attrition milling and characterized. The substitution, x was changed from 0 to 0.3. The magnetic properties were evaluated by vibrating sample magnetometry and thermomagnetic analysis. Mössbauer spectroscopy and X-ray diffraction techniques were used to investigate the magnetocrystalline structure. Our experimental results suggest that Ni–Sn cationic mixtures produce similar effects on the magnetic properties, to those observed for Ir–Co and Ir–Zn substitutions. The Ni 2+–Sn 4+ substitution reduced the uniaxial magnetic anisotropy field, H a rather fast, becoming planar at low rates. Mössbauer studies revealed that Sn 4+ ions replace Fe 3+ ions on 2b and 4f 1 sites, while Ni 2+ ions preferred 4f 2 and 2a sites. A large variation of the intrinsic coercivity, H ci, (381.9–93.9 kA/m) was obtained as a function of the substitution.