Structural and magnetic properties of Laves compounds Dy1−xPrx(Fe0.35Co0.55B0.1)2 (⩽x⩽1)

Abstract

Dy 1−x Pr x ͑Fe 0.35 Co 0.55 B 0.1 ͒ 2 ͑0 ഛ x ഛ 1͒ Laves compounds with a cubic MgCu 2 -type structure were synthesized by arc melting and subsequent annealing. The lattice parameter of the Laves compounds linearly increases, while the Curie temperature T C decreases with increasing Pr content. The saturation magnetization M s at 5 K or 295 K for the Dy 1−x Pr x ͑Fe 0.35 Co 0.55 B 0.1 ͒ 2 alloys decreases to reach a minimum, then increases with increasing Pr content. The composition for magnetic moment compensation is about x = 0.55 at 295 K and x = 0.65 at 5 K, respectively. The magnetostriction ʈ or Ќ at room temperature was investigated either parallel or perpendicular to the applied field using a standard strain gauge technique.

Structure and anisotropic compensation of Tb1−xPrx(Fe0.4Co0.55B0.05)1.93 (0≤x≤1) magnetostrictive alloys

“…Ren the partial substitution of Co for Fe can effectively prevent the appearance of the secondary phase [9]. In the present paper, the Pr-containing alloys according to the nominal composition Tb 1−x Pr x (Fe 0.4 Co 0.55 B 0.05 ) 1.93 (0 ≤ x ≤ 1), chosen carefully based on the analysis of the previous work [9][10][11], are prepared by arc melting and subsequent annealing. We expected that the introduction of B/Co element may eliminate the generation of the second phase, and the bulk single-phase (Tb,Pr)(Fe,Co,B) 2 compounds, prepared by equilibrium condition at ambient pressure, are studied with x from 0 to 1.…”

Structure, magnetic properties and magnetostriction of laves compounds Nd1−xPrx(Fe0.35Co0.55B0.1)2

“…It can be seen that T c of the Laves phase decreases linearly with increasing Pr content, because T c of PrFe 2 and PrCo 2 are lower than that of NdFe 2 and NdCo 2 , respectively. The Curie temperature T c of Pr(Fe 0.35 Co 0.55 B 0.1 ) 2 is 326 K, in consistent with T c of the Laves phase with close composition [15].…”

“…at room temperature of the Nd 1Àx Pr x (Fe 0.35 Co 0.55 B 0.1 ) 2 alloys. [15]. The abnormal magnetostriction is mainly due to the competition between the positive magnetostriction of NdFe 2 [12] and PrFe 2 [5] and the negative magnetostriction of NdCo 2 and PrCo 2 [17].…”

Structure and magnetic properties of magnetostrictive compounds Tb0.36Dy0.64(Fe0.85Co0.15)2−xBx (0⩽x⩽0.15)

“…So, it is preferential that boron replaces the Type-II Fe atoms when xp0. 10. On further increasing the boron content, it starts to enter the interstitial sites and both CS (I) and CS (II) are changed complexly.…”

“…Recently, additions of some elements with small atomic radius, such as H, B, and Be, have been reported to improve the magnetostriction of Tb x Dy 1Àx Fe 2 compounds [7][8][9]. Boron stabilizes the RFe 2 Laves phase (Rrare earth) in Tb 0.27 Dy 0.73 Fe 2 [8] and several Pr based R-Fe compounds [10,11]. In some cases, boron atoms enter into the interstitial sites of Laves phase, enhancing Curie temperature of Tb 0.2 Pr 0.8 (Fe 0.4-Co 0.6 ) 1.93-x B x compounds.…”