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Preparation and Properties of ε-Fe3N-Based Magnetic Fluid

Wei Huang12* and Xiaolei Wang1

Author Affiliations

1 Jiangsu Key Laboratory of Precision & Micro-manufacturing Technology, Nanjing University of Aeronautics & Astronautics, Nanjing, 210016, China

2 Department of Functional Material Research, Central Iron & Steel Research Institute, Beijing, 100081, People’s Republic of China

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Nanoscale Research Letters 2008, 3:260-264  doi:10.1007/s11671-008-9148-y

Published: 25 July 2008


In this work, ε-Fe3N nanoparticles and ε-Fe3N-based magnetic fluid were synthesized by chemical reaction of iron carbonyl and ammonia gas. The size of ε-Fe3N nanoparticles was tested by TEM and XRD. Stable ε-Fe3N-based magnetic fluid was prepared by controlling the proper ratio of carrier liquid and surfactant. The saturation magnetization of stable ε-Fe3N-based magnetic fluid was calculated according to the volume fraction of the particles in the fluid. The result shows that both the calculated and measured magnetizations increase by increasing the particle concentration. With the increasing concentration of the ε-Fe3N particles, the measured value of the magnetic fluid magnetization gradually departs from the calculated magnetization, which was caused by agglomeration affects due to large volume fraction and large particle size.

Iron nitrides; Magnetic fluids; X-ray diffraction; Magnetic properties