Structure and magnetic properties of PrCo6.7−xCuxTi0.3 compounds

Abstract

The phase structure and magnetic properties of PrCo6.7−xCuxTi0.3 (x=0–1) compounds have been studied. The compounds were prepared by arc melting and subsequent annealing. With an increase of Cu content, the 2:17 phase disappears and the single 1:7 phase with TbCu7-type structure is formed for samples x>0.4. Tc2:17 and Tc1:7 in samples x=0–0.4 decrease with an increase of Cu content. Tc1:7 in samples x>0.4, however, is almost the same. For samples x>0.4, the study of their anisotropy indicates that these samples have uniaxial anisotropy at 293 K. The addition of Cu weakens the anisotropy of the Co sublattice and enhances the anisotropy of the Pr sublattice, which causes the spin reorientation temperature to increase.

Effects of the doping element on crystal structure and magnetic properties of Sm(Co,M)7 compounds (M=Si, Cu, Ti, Zr, and Hf)

“…The reason is that Zr and Hf have larger atomic radii than Ti, Cu, and Si and that the ratio of the atomic radius r P is still between 1.420 and 1.436 when Sm is replaced or partly replaced by Nd or Pr. Recently, Zhang et al found that the PrCo 6.7 Ti 0.3 compounds cannot be formed by arc melting [23,24], but the PrCo 6.7Kx Cu x Ti 0.3 compounds can be synthesized by arc melting when x exceeds 0.4 [24]. This can also be explained by the effect of atomic radius according to Eq.…”

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

“…[132] TbCu 7 structure is observed in the Pr-Co alloys as well. Zhang et al reported the stabilized 1:7 phase in both compound through arc melting [133] and nanocrystalline powders with an average grain size of 20 nm through mechanical alloying of PrCo 7−x Ti x alloys with an energy product of 10.6 MGOe. [134] With the assistance of C addition, Kostogorova et al successfully fabricated the (Pr x Co 1−x ) 94 Ti 3 C 3 ribbons consisting of 1:7 phase with a coercivity around 1.0 T through melt spinning and post-annealing.…”

Crystal structure and magnetic properties of PrCo6.8 xCuxHf0.2compounds

“…PrCo 7 phase cannot be stabilized by Ti, and the single phase Pr(Co,Ti) 7 can only be formed by mechanical milling [6]. However, Zhang et al [12] have recently reported that PrCo 6.7−x Cu x Ti 0.3 compounds with 0.4 x 1.0 crystallizes in the single 1 : 7 phase. This indicates that Cu is an effective stabilizing element for Pr(Co,Ti) 7 compounds, although Cu alone does not stabilize the PrCo 7 phase.…”