Grain Size Dependent Magnetic Properties of Nanocrystalline Sm2Co17/Cu
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE THIAIS (FRANCE) LAB DE CHIMIE METALLURGIQUE DES TERRES RARES
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The evolution of both micro structural and magnetic properties of the Sm2Co17-Cu powder, is studied us a function of soft co-milling time. The average grain size in the range 20 - 50 nm was determined by transmission electron microscopy coupled with x-ray diffraction using the Rietveld method. The particle shape and chemical distribution were investigated by elemental mapping, using wavelength dispersive x-ray analysis with electron microprobe analysis. The coercivity evolution shows that an optimum value of 6 kOe is obtained after 5 h co-milling. The microstructure analysis indicates that both materials are well mixed in nanometer scale. This technique appears as a potential route to synthesize nanocrystalline Sm2Co17 isolated by non-magnetic metal Cu.
- Properties of Metals and Alloys