Electromagnetic Properties of Substituted Ba - Ferrites by Selected Cations

• Main Authors: Anna Gruskova, Maria Papanova, Josef Slama, Darina Kevicka
• Format: Article
• Language: English
• Published: VSB-Technical University of Ostrava 2004-01-01
• Series: Advances in Electrical and Electronic Engineering
• Subjects: barium; magnetic; magnetocrystalline; ions; position.
• Online Access: http://advances.utc.sk/index.php/AEEE/article/view/424

The powdered samples of barium hexaferrite BaFe12-2x(Me1Me2) with x varying from 0.0 to 0.6 were prepared by citrate precursor method. The cation preference of mainly four-valence Me1=(Zr, Ti, Sn) ions and two-valence Me2=(Co, Ni, Zn) ions and their combinations in substituted Ba ferrites were investigated by the thermomagnetic analysis, Mossbauer spectroscopy and measurement of the magnetic properties. Mossbaur studies reveal that Zr4+, Sn4+ and less Co2+, Zn2+ ions have a strong preference to occupy 2b position, this position has the greatest contribution to the magnetocrystalline anisotropy. The La3+, Ti4+, Ni2+ ions preferently enter 4f2 sites and Zn2+, Co2+ ions also prefer to occupy 4f1 tetrahedral sites. The specific saturation magnetic polarisation Js-m and remanence Js-r increased with small x due to th substitution of non-magnetic and less magnetic ions in 4f1 and 4f2 sites. The coercivity Hc was casily controllable by the sustituions level x.