Magnetic structure of Sn2+Ru4+-substituted barium hexaferrites prepared by mechanical alloying

• Published in: Materials letters Vol. 59; no. 14-15; pp. 1815 - 1819
• Main Authors: Gonzalez-Angeles, A, Mendoza-Suarez, G, Gruskova, A, Slama, J, Lipka, J, Papanova, M
• Format: Journal Article
• Language: English
• Published: 01.06.2005
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2005.01.072

M-type barium hexaferrite fine particles with composition BaFe12-2xSnxRuxO19 (0.0 < or = x < or = 0.3) were obtained by mechanical alloying. The effect of Sn2+-Ru4+ substitution on the magnetic properties and microstructure of the powders was investigated by Mossbauer spectroscopy, XRD, vibrating sample magnetometry (VSM) and thermomagnetic analysis. Mossbauer studies revealed that Sn2+ ions replaced Fe3+ ions on octahedral sites (4f2 and 2a), while Ru4+ preferred the tetrahedral 4f1 and bipyramidal 2b sites. Ms rise up to obtain a value of 64.2 A m2/kg as x increased. The increase of Ms owes to the site preference occupancy of Sn2+-Ru4+ mixture. The sharp decrease of the intrinsic coercivity (381.1-109 kA/m) has its origin on 4f2 and 2b sites replacement.