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http://dx.doi.org/10.4191/KCERS.2005.42.10.672

Synthesis of Sr-Ferrite by a Molten Salt Flux and Its Magnetic Properties  

Kim, Jung-Sik (Department of Materials Science and Engineering, The Univerity of Seoul)
Kim, Si-Dong (Department of Materials Science and Engineering, The Univerity of Seoul)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.10, 2005 , pp. 672-677 More about this Journal
Abstract
In this study we prepared the Sr-ferrite powders and magnet by a molten salt method using the (NaCl+KCl) salt mixture. Starting materials of $Fe_{2}$$O_{3}$ and Sr$Co_{3}$ were mixed as the molar ratio of 5.70:1, and 0.08 mol$ \% $ $Al_{2}$$O_{3}$, 0.10 mo1$ \% $ Si$O_{2}$ and 0.12 mo1$ \% $ CaO were added as additives. Sr-ferrite powders synthesized at the reaction temperatures of 800$\∼$1200$ ^{\circ}C $ showed the typical M-type hexagonal ferrite phase, and hexagonal plate-like morphology with uniform distribution of 1$\∼$3 $\mu$m particle size. The bulk density of the sintered Sr-ferrite magnet prepared with powders by the molten salt method showed the maximum density of 4.82 g/$cm^{3}$ at the sintering temperature of 1200$^{\circ}C $. The maxima of remanent flux density (Br, 45 emu/g) and coercive force (iHc, 3.75 kOe) occurred at the sintering temperatures of 1150$ ^{\circ}C$ and 1200$^{\circ}C $.
Keywords
Ferrite; Permanent magnet; Magnetic properties; Ceramic processing;
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