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Crystallographic and Magnetic Properties of MnxFe3-xO4 Powders |
Journal of Magnetics, Volume 18, Number 1, 31 Mar 2013, Pages 26-29 |
Woo Hyun Kwon (Department of Applied Physics, Konkuk University), Jae-Gwang Lee * (Department of Applied Physics, Konkuk University), Won Ok Choi (Department of Applied Physics, Konkuk University), Kwang Pyo Chae (Department of Applied Physics, Konkuk University) |
Abstract |
MnxFe3-xO4 powders have been fabricated by using sol-gel methods; their crystallographic and magnetic properties were investigated by using X-ray diffraction, scanning electron microscopy, Mössbauer spectroscopy, and vibrating sample magnetometer. The MnxFe3-xO4 ferrite powders annealed at 500 oC had a single spinel structure regardless of the Mn2+-doping amount and their lattice constants became larger as the Mn2+ concentration was increased. Their Mössbauer spectra measured at room temperature were fitted with 2 Zeeman sextets due to the tetrahedral and octahedral sites of Fe ions, which made them ferrimagnetic. The magnetic behavior of MnxFe3-xO4 powders showed that the Mn2+-doping amount made their saturation magnetization increase, but there were no severe effects on their coercivities. The saturation magnetization of the MnxFe3-xO4 powder varied from 38 emu/g to 70.0 emu/g and their minimum coercivity was 111.1 Oe.
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Keywords: Mn-Fe ferrite; sol-gel method; Mössbauer spectroscopy; soft magnetic material |
DOI: http://dx.doi.org/10.4283/JMAG.2013.18.1.026 |
Full Text: PDF |
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