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Erschienen in:
01.09.2011
The effect of nano sized SrFe12O19 additions on the magnetic properties of chromium-doped strontium-hexaferrite ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 9/2011
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Abstract
Strontium hexaferrite (SrFe12O19) which crystallizes in the hexagonal system and has a uniaxial magnetoplumbite structure, displays distinctive magnetic characteristics, good chemical stability, good tribological properties and a weak temperature dependent coercivity at about room temperature. In the present work the synthesis conditions for the solid-state preparation of the chromium-doped hexaferrite SrCr0.3Fe11.7O19 were optimised and the effect on the magnetic properties of this compound of additions of nanosized SrFe12O19 was studied. The nanosized SrFe12O19 additive, synthesized by the citrate–nitrate reaction, was substituted in varying amounts for a commercial calcium silicate borate sintering additive mixture. A combination of 0.75 wt% of nano-sized SrFe12O19 with 0.75 wt% of the commercial additive increases the intrinsic coercivity, remanence magnetization and rectangularity ratio and results in superior magnetic properties than obtained with 1.5 wt% of nanosized SrFe12O19 or the commercial sintering additive alone.