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Abstract
The structure, magnetic properties and magnetostriction of high-pressure synthesized Pr1−xDyx(Fe0.8Co0.2)1.93 compounds were investigated. These compounds, which could not be readily synthesized under ambient pressure, exhibit single cubic Laves phase owing to the effects of high-pressure annealing. The Curie temperature increases with increasing x, indicating that 3d-4f coupling becomes stronger with the increase of Dy concentration. The saturation magnetization decreases with increasing x, which can be ascribed to the competition of sublattice magnetization. The easy magnetization direction of the compound lies along <111 > with x ≤ 0.05 while lies along <100 > when x ≥ 0.10. Meanwhile, the low-field magnetostriction λ∥ − λ⊥ of the compound system peaks at x = 0.05 and then decreases with increasing x, which reveals that the composition anisotropy compensation between Pr3+ and Dy3+ might be realized in Pr1−xDyx(Fe0.8Co0.2)1.93 system. Pr0.95Dy0.05(Fe0.8Co0.2)1.93 compound combines a large low-field magnetostriction (648 ppm at 3 kOe) and the merits of low-cost raw materials, which may make it a potential material for magnetostrictive application.
Highlights
Giant magnetostrictive materials have been widely applied in acoustic transducers, actuators and sensors etc
The signs of K1 for PrFe2 and DyFe2 are the same with each other, Ren et al phenomenologically proved that the anisotropy compensation between Pr3+ and Dy3+ ions can be realized at room temperature by considering the contribution of anisotropy constant K2.5 Pr1−xDyxFe2 single cubic Laves phase could not be synthesized by traditional annealing method when the concentration of Pr exceeds 20 at.% in rare earth sublattice.[4]
As for the sample with x = 0.3, (PrDy)(FeCo)[2] phase with MgCu2-type structure emerges, the main phase is (PrDy)(FeCo)[3] with PuNi3-type structure, coexisting with a small amount rare earth phase. These results illustrate that single cubic Laves phase Pr1−xDyx(Fe0.8Co0.2)1.93 compounds with high-Pr content could not be readily prepared by traditional annealing method even with the help of 20 at.% Co substitution for Fe
Summary
Giant magnetostrictive materials have been widely applied in acoustic transducers, actuators and sensors etc. To minimize the magnetocystalline anisotropy of RFe2 (R=rare earths) cubic Laves compounds and achieve large low-field magnetostriction, Clark et al proposed RxR1′−xFe2 composition anisotropy compensation system by combining two different RFe2 alloys with opposite signs of K1, such as TbxDy1−xFe2 and TbxHo1−xFe2.1,2 According to the single-ion model, PrFe2 should possess a giant calculated magnetostriction constants of 5600 ppm at 0 K, which is much larger than that of TbFe2 (4400 ppm), DyFe2 (4200 ppm) and HoFe2 (1600 ppm).[3] the mineral resource of Pr is much richer than those heavy rare earths.
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