Transmission electron microscopy study of structural disorder in Sm(Co0.5Cu0.5)5 alloy

Coercivity of Sm(Co0.9Cu0.1)4.8 melt-spun ribbons

“…Copper substituted SmCo 5 ribbons melt-spun at lower wheel surface speeds (5-10 m/s) were shown to exhibit a remenence of 9.5 kG and coercivity of 17 kOe [12]. It was reported that the partial substitution of copper in SmCo 5 alloys results in higher coercivity [13][14][15][16][17][18][19][20]. Recently Zhang et al have studied the effect of Cu substitution on structural and magnetic properties of anisotropic Sm-Co ribbons obtained at the wheel surface speed of 5 m/s [21].…”

On the nature of the disordered microstructure in Sm(Co,Cu)5 alloys with increasing Cu content

“…The complex nature of the microstructure is also illustrated by the fact that other polytypes are occurring in the sample as reported by Estevez et al [10].…”

“…Observed by optical, Kerr and electron microscopy, the microstructure shows the occurrence of heavy disorder in the samples and strong evidence of planar faulting was observed by transmission electron microscopy (TEM) [10][11][12]. The same disorder was observed by optical microscopy indicating that the observed features were not result of sample preparation in the TEM samples.…”

“…This kind of disorder will result in the broadening of the diffraction profiles together with the increase of the interlayer distance. Considering the model of disorder proposed by Allen et al [17] and Estevez-Rams et al [10], the shift of the composition towards a Sm rich region of the binary phase diagram should lead to the Sm 2 Co 7 structure. The structural mechanism comes from the appearance of sessile dislocations result of the solution of Sm atoms into the CaCu 5 structure (Fig.…”

Microstructure, microchemistry, and coercivity in Sm–Co–Cu and Pr–Co–Cu 1:5 alloys

“…Although considerable attempts have been made to reveal the mechanism of magnetic hardening in Cusubstituted SmCo 5 alloys, the origin of coercivity is still not clear [5,6]. Especially, there is lack of microstructural studies at the atomic level in 1:5 alloys.…”