Abstract
Abstract
We describe the synthesis and characterization of magnetic materials with improved magnetic properties for permanent magnet applications. Sr1−x
RE
x
Al2Fe10O19 (RE = La, Ce, Tb, and Dy; x = 0.0 and 0.1) were prepared by ball milling and sintering at 1200 °C for 6 h. The effects of (Al3+–RE3+) substitution on the structural and magnetic properties of SrM hexaferrites were investigated by x-ray diffraction, scanning electron microscopy, and magnetic measurements at low (5 K), and high temperatures (from room temperature to above Curie temperature). The sample with x = 0, and that with La substitution, consisted of a single SrM phase. The rest of the samples contained traces of secondary oxide phases, and exhibited a small reduction in lattice parameters compared with the unsubstituted SrFe12O19. The coercivity of the samples (8800 ≤ H
cM
≤ 9750 Oe) was more than double the standard value of the unsubstituted compound, and the Curie temperatures was >300 °C for all samples. Also, the saturation magnetization (32.5–46.4 emu g−1) was high enough to make the overall magnetic properties of these compounds potentially important for the permanent magnet industry.
Subject
Metals and Alloys,Polymers and Plastics,Surfaces, Coatings and Films,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
11 articles.
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