Modification of the magnetic properties of SmCo5 particles depending on the grinding atmosphere

Myrtil L. Kahn (1) , Jean-Louis Bobet (1) , François Weill (1) , Bernard Chevalier (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Particles of SmCo5 were synthesized and ground mechanically under two different gaseous atmospheres (Ar or H2). The influence of the gaseous atmosphere on the crystallinity, the morphology of the particles and their magneticproperties has been studied. The major differences in terms of crystallinity and morphology are reached after 20 min of grinding. The sample ground under H2 is still well crystallized whereas the homologous sample ground under Ar is almost amorphous. For longer grinding times, both the crystallinity and morphology are very close whatever the gaseous atmosphere. The sample is amorphous and consists of aggregates. However, for the sample ground under H2 during 2 h, formation of SmH2+δ and Co is observed. Values of the coercivity and saturation magnetization are discussed in regard to these characteristics.

Mots clés: Permanent magnetic materials; Powder metallurgy; X-Ray diffraction; SEM; TEM

Domaines: Matériaux

Myrtil L. Kahn, Jean-Louis Bobet, François Weill, Bernard Chevalier. Modification of the magnetic properties of SmCo5 particles depending on the grinding atmosphere. Journal of Alloys and Compounds, 2002, 334 (1-2), pp.285-292. ⟨10.1016/S0925-8388(01)01790-X⟩. ⟨hal-00708242⟩