Abstract
Several pseudo-binary RxR'2-xFe17 alloys (with R = Y, Ce, Pr, Gd and Dy) were synthesized with rhombohedral Th2Zn17-type crystal structure determined from x-ray and neutron powder diffraction. The choice of compositions was done with the aim of tuning the Curie temperature (TC) in the 270 ± 20 K temperature range, in order to obtain the maximum magneto-caloric effect around room temperature. The investigated compounds exhibit broad isothermal magnetic entropy changes, ΔSM(T), with moderate values of the refrigerant capacity, even though the values of ΔSMPeak are relatively low compared with those of the R2Fe17 compounds with R = Pr or Nd. The reduction on the ΔSMPeak is explained in terms of the diminution in the saturation magnetization value. Furthermore, the ΔSM(T) curves exhibit a similar caret-like behavior, suggesting that the magneto-caloric effect is mainly governed by the Fe-sublattice. A single master curve for ΔSM/ΔSMPeak(T) under different values of the magnetic field change are obtained for each compound by rescaling of the temperature axis.
Highlights
A wide family of magnetic intermetallic compounds arises from alloying rare-earth (R) elements and 3d transition metals (M) [1,2]
Localized magnetism of rare-earth sublattice combined with an itinerant magnetism of the 3d sublattice makes these magnetic intermetallics very attractive from both fundamental Solid State Physics and commercial applications
In the present work we report on the synthesis, the crystal structure, the magnetic properties and the magneto-caloric response of five pseudo-binary intermetallic alloys: Y1.2Ce0.8Fe17, Pr1.5Ce0.5Fe17, Gd1.3Ce0.7Fe17, Dy1.15Ce0.85Fe17 and YPrFe17
Summary
A wide family of magnetic intermetallic compounds arises from alloying rare-earth (R) elements and 3d transition metals (M) [1,2]. For R = Pr or Nd moderate values for the maximum of the isothermal magnetic entropy change, (ΔSMPeak ≈ 6 J/kg K-1 for a change of the applied magnetic field μ0∆H = 5 T), together with broad maxima of the ΔSM(T) curves, give rise to a large refrigerant capacity (RC) [4,5,6]. From the structural point of view, these compounds present polymorphism with two different types of crystal structure depending on the rare-earth element.
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