Nanocrystalline magnetite and Mn-Zn ferrite particles via the polyol process: Synthesis and magnetic properties

作者：Toepfer J^*; Angermann A

来源：Materials Chemistry and Physics, 2011, 129(1-2): 337-342.

DOI：10.1016/j.matchemphys.2011.04.025

• Magnetic materials
• Chemical synthesis
• Magnetic properties

Nanocrystalline Fe(3)O(4) and Mn-Zn ferrite powders with crystallite sizes of 10 and 7 nm, respectively, and narrow size distribution were synthesized in a triethylene glycol medium. Mn-Zn ferrite particles with crystallite size of 9 and 12 nm were obtained after annealing of the as prepared ferrite particles at 300 and 500 degrees C, respectively. The saturation magnetization at 5 K of the Mn-Zn ferrite obtained at 300 degrees C (79 emu g(-1)) is smaller than that of the bulk material. Hysteresis loop measurements indicate ferrimagnetic behavior at 5 K and superparamagnetic behavior at 295 K. The Mn-Zn ferrite nanocrystals obtained at 500 degrees C, however, exhibit a smaller M(s) compared to the ferrite annealed at 300 degrees C indicating a change in the cation distribution.

• 出版日期2011-9-15