Structure, magnetic properties and magnetostriction of Dy 1− xPr x(Fe 0.9B 0.1) 1.93 (0≤ x≤0.8) alloys

Abstract

The structure, magnetic properties and magnetostriction of Dy 1− x Pr x (Fe 0.9B 0.1) 1.93 (0≤ x≤0.8) alloys have been investigated using X-ray diffraction, ac initial susceptibility, vibrating sample magnetometry and standard strain gauge technique. The (Dy, Pr)(Fe, B) 2 magnetostrictive phase with cubic MgCu 2-type structure exists up to x=0.6. The magnetization of the alloys with 0≤ x≤0.5 decreases with increasing Pr content, due to the antiparallel alignment of Pr and Dy moments in the (Dy, Pr)(Fe, B) 2 phase. The coercivity remains relative low values in the alloys without Nd 2Fe 14B-type phase and increases pronouncedly with the emergency of this phase. The Pr solubility limit in the (Dy 1− x Pr x )(Fe, B) 2 phase is limited to the range 0.5≤ x≤0.6 determined by analysis of structure and magnetic properties. The magnetostriction λ a= λ ||− λ ⊥ of the Dy 1− x Pr x (Fe 0.9B 0.1) 1.93 alloys with 0≤ x≤0.3 increases with increasing Pr content, due to increment of the saturation magnetostriction λ s contributed by the large λ 111 of PrFe 2 and partial compensation of the anisotropy.