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Synthesis and Physical Properties of MO·Fe12O18 (M/Ba and Sr) Nanoparticles Prepared by Sol-Gel Method Using Propylene Oxide  

Lee, Su Jin (Department of Chemical System Engineering, Keimyung University)
Choe, Seok Burm (Department of Chemical System Engineering, Keimyung University)
Gwak, Hyung Sub (Department of Chemical System Engineering, Keimyung University)
Paik, Seunguk (Department of Chemical System Engineering, Keimyung University)
Publication Information
Applied Chemistry for Engineering / v.17, no.4, 2006 , pp. 420-425 More about this Journal
Abstract
Nano sized mixed metal hexagonal ferrite powders with improved magnetic properties have been prepared by sol-gel method using propylene oxide as a gelation agent. To obtain the desired ferrite, two different metal ions were used. One of the ions has only +2 formal charge. The key step in the processes is that hydrated $Ba^{2+}$ or $Sr^{2+}$ ions are hydrolyzed and condensed at the surface of the previously formed $Fe_{2}O_{3}$ gel. In this processes, all the reaction can be finished within a few minutes. The magnetic properties of the produced powder were improved by heat treatment. The highest values of the magnetic properties were achieved at temperature $150^{\circ}C$ lower than those of the previously published values. The highest observed values of coercivity and the saturation magnetization of Sr-ferrite and Ba-ferrite powder were 6198 Oe, 5155 Oe and 74.4 emu/g, 68.1 emu/g, respectively. The ferrite powder annealed at $700^{\circ}C$ showed spherical particle shapes. The resulting spheres which were formed by the aggregation of nanoparticles with size 3~5 nm have diameter around 50 nm. The powder treated at $800^{\circ}C$ showed hexagonal-shaped grains with crystallite size above 500 nm.
Keywords
propylene oxide; sol-gel; Ba-ferrite; Sr-ferrite;
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