Magneto-crystalline properties of BaFe 12-2x M x Sn x O 19 (M = Sn, Ni, Zn) ferrite powders A. Grusková & J. Lipka & J. Sláma & V. Jančárik & M. Papánová & M. Štofka & A. González & G. Mendoza Published online: 5 December 2006 # Springer Science + Business Media B.V. 2006 Abstract BaFe 12-2x M x Sn x O 19 compounds, where M=Sn 2+ , Ni 2+ or Zn 2+ ions, were synthesized by mechanical milling and partially by citrate precursor methods. Analysis of magneto-crystalline structure has been carried out by Mössbauer spectroscopy. The Sn 4+ ions replace Fe 3+ ions on 2b and slightly on 2a+4f 1 sites, Zn 2+ ions strongly prefer 4f 1 sites, Sn 2+ ions prefer 4f 1 sites too and Ni 2+ ions occupy 4f 2 and 12k or 2a sites. The magnetic properties were evaluated by the vibrating sample magnetometry and the ther- momagnetic analysis. A large variation of the intrinsic coercivity H c (330 to 78 kA/m) and of temperature coefficient of coercivity of ΔH c /Δϑ (0.39 to 0.22 kA/m°C) were achieved as a function of the (Zn–Sn) and (Sn–Sn) substitutions, respectively. The Curie temperature T c decreased with the (Ni–Sn) substitution from 447 to 399°C. Key words magnetic properties . substitutional effects . Mössbauer spectra . hexagonal ferrites Hyperfine Interact (2006) 169:1223–1230 DOI 10.1007/s10751-006-9428-9 A. Grusková : M. Papánová Department of Electrotechnology, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovak Republic A. Grusková e-mail: anna.gruskova@stuba.sk J. Lipka (*) Department of Nuclear Physics and Technology, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovak Republic e-mail: jozef.lipka@stuba.sk J. Sláma : V. Jančárik : M. Štofka Department of Electromagnetic Theory, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovak Republic A. González : G. Mendoza Cinvestav-Saltillo, Carr. Saltillo-Mty. Km. 13, P.O. Box 663, 25000 Saltillo, Coahuila, Mexico