Preparation and characterization of nano-scale Fe2P-based particles by surfactant-assisted high-energy ball milling

Conference paper (2011)

Authors

N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
E.H. Brück RST/Fundamental Aspects of Materials and Energy - AS
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
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Published Date

2011

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

Magnetocaloric nanoparticles based on the Fe2P system have been prepared by ball milling in the presence of the organic solvent heptane and the surfactant oleic acid. The surfactant is used to prevent the re-welding of crushed particles during the ball milling and to enhance the dispersion of nanoparticles in the solvent [1]. A size selection process using centrifugation and ultrasonic vibration was employed after ball milling to obtain nanoparticles with a narrow size distribution. The XRD peak intensity decreases while the peaks broaden in the presence of surfactant and solvent, indicating a decrease in particle size and an increase in the degree of amorphization. The magnetization of the nanoparticles obtained by surfactant-assisted high-energy ball milling decreased compared to the bulk. This can be attributed to a larger contribution of the surface states due to the size reduction, amorphization and contamination such as residual surfactant. The effect of milling parameters on Fe2P-based compounds as nano-scale particles as well as their dynamic response by nanosizing will be discussed in detail.