Structural and magnetic properties of Pr2Co7-xFex Phase synthesized by mechanical alloying
Book Chapter
Bessais, L, Fersi, R, Cabié, M et al. (2013). Structural and magnetic properties of Pr2Co7-xFex Phase synthesized by mechanical alloying
. 97-104. 10.1002/9781118663547.ch13
Bessais, L, Fersi, R, Cabié, M et al. (2013). Structural and magnetic properties of Pr2Co7-xFex Phase synthesized by mechanical alloying
. 97-104. 10.1002/9781118663547.ch13
This study has highlighted the structural and magnetic evolutions of Pr2Co7-xFe3 compounds. We have demonstrated that it is possible to obtain almost single-phase Ce2Ni7 structure by mechanical grinding high energy followed by a heat treatment of 30 minutes. With Rietveld analysis, we have determined the crystallographic parameters for each iron content studied. The expansion of the cell volume is pronounced in the basal plane (a, b) when substituting. This is due to the slightly decrease of the lattice parameter ratio c/a with Fe content. The autocoherent diffraction domain size derived from Rietveld analysis, varying between 26 and 130 nm, are confirmed by transmission electron microscopy. The study of the intrinsic magnetic properties of these alloys shows that the Curie temperature of the Pr2Co7 alloy was improved by 160 K (an increase of 26%) for x = 0.5, which confirms the hypothesis of influence of iron electronic density on the intrinsic properties. In addition, the study of the extrinsic magnetic properties of the Pr2C06.75Fe0.25 compound revealed a significant coercivity at room temperature of the order of 12 kOe, the energy product (BH)max = 9 MGOe for the sample annealed at 973 K. This leads to materials with interesting magnetic properties in the field of the permanent magnets.
