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

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].…”

Evolution of the microstructure and magnetic properties of Sm(Co0.6Cu0.4)5alloys prepared with different Sm excess content

“…The stacking sequence, in this crystal structure, along the [0 0 1] crystallographic direction results from the successive stacking of identical atomic layers without lateral displacement between them. Several types of disorder has been described in the Sm-Co system [24][25][26] that can be broadly described in two types: compositional disorder and structural disorder. The compositional disorder is associated with the appearance of a pair of cobalt dumbbell sites typical of the Sm 2 Co 17 structure [27] or with local Sm excess in the structure.…”

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

“…There is still discussion on the nature of the disorder in Cu substituted SmCo 5 compounds [13][14][15][16]. While it is believed that Cu enhances the Sm solubility in the alloy driving the compound towards the Sm 2 Co 7 phase, there is also indications that disordered SmCo 7 phase can also be present in the heat treated sample.…”