Crystallographic and Magnetic Properties of Mn<SUB>x</SUB>Fe<SUB>3-x</SUB>O₄ Powders

다국어 초록 (Multilingual 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, Mossbauer spectroscopy, and vibrating sample magnetometer. The MnxFe3-xO₄ ferrite powders annealed at 500 ℃ had a single spinel structure regardless of the Mn²?-doping amount and their lattice constants became larger as the Mn²? concentration was increased. Their Mossbauer 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.

목차 (Table of Contents)

• 1. Introduction
• 2. Experiments
• 3. Results and Discussion
• 4. Conclusion
• References