Crystal structure, magnetic properties and magnetocaloric performance of RE5Rh2In4 (RE = Gd-Tm) compounds
Abstract
Polycrystalline samples of the RE5Rh2In4 (RE = Gd--Tm) intermetallics have been investigated by means of X-ray diffraction (XRD) as well as by DC and AC magnetometric measurements. The XRD data confirm that the compounds crystallize with the orthorhombic Lu5Ni2In4-type structure (space group Pbam, No. 55). With decreasing temperature, RE5Rh2In4 spontaneously order magnetically with the critical temperatures of magnetic order equal to 10.6, 14.2, 15.4, 7.2, 5.9 and 4.9 K for RE = Gd, Tb, Dy, Ho, Er and Tm, respectively. The compounds have complex magnetic properties, showing features characteristic of both ferro- and antiferromagnetic orderings. Moreover, the magnetic properties change with increasing number of the 4f electrons from predominantly ferromagnetic in Gd5Rh2In4 to predominantly antiferromagnetic in Tm5Rh2In4. The magnetic data indicate that only the rare earth atoms carry magnetic moments. The maximum magnetic entropy change (- SMmax) at the 0-9 T magnetic flux density change ( μ0 H) equals 12.4 J·kg-1·K-1 at 17 K for Gd5Rh2In4, 11.3 J·kg-1·K-1 at 28 K for Tb5Rh2In4, 13.1 J·kg-1·K-1 at 19 K for Dy5Rh2In4, 16.4 J·kg-1·K-1 at 12 K for Ho5Rh2In4, 15.3 J·kg-1·K-1 at 8 K for Er5Rh2In4 and 12.6 J·kg-1·K-1 at 6.5 K for Tm5Rh2In4. For a selected rare earth element (RE), the member of the RE5Rh2In4 family of compounds reaches the highest - SMmax value, when compared with its RE5T2In4 (T = Ni, Pd, Pt) isostructural analogues, making the RE5Rh2In4 intermetallics a good choice for application in low-temperature magnetic refrigeration.
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