20.500.12556/RUL-185678 Giant magnetocaloric effect in the quaternary Fe–Rh–Pd–Ir alloy experimental and first-principles study The magnetothermal properties of the quaternary Fe▫$_{49}$▫Rh▫$_{46.1}$▫Pd▫${3.1}$▫Ir▫$_{1.8}$▫ alloy are investigated by a combination of first-principles calculations, structural characterization, magnetometry, calorimetry, and direct measurements of the adiabatic temperature change. An exceptional magnetocaloric response is obtained, with ΔT▫$_{ad}$▫ reaching −11.9 K in a field of 1.85 T under the discontinuous protocol and −8.6 K under the continuous (cyclic) protocol, both values exceeding those reported to date for FeRh-based alloys under comparable conditions. The enhancement originates from a combination of structural and electronic properties: a nearly single-phase B2 composition, induced magnetic moments on Pd and Ir predicted by first-principles calculations, and a narrow magnetostructural transition (∼6 K). In addition, the present composition exhibits an exceptionally small thermal hysteresis of ∼6 K, which is among the smallest reported for the FeRh family and preserves a large magnetocaloric response under cyclic operation. The high transition temperature of ∼411 K further distinguishes the present composition from conventional near-room-temperature magnetocaloric systems. The temperature dependences of the lattice parameter, magnetization, heat capacity, and magnetocaloric response are presented and compared with literature data for binary and ternary FeRh-based alloys. magnetocaloric effect adiabatic temperature change Fe-Rh alloys first-order phase transition first-principles calculations magnetokalorični učinki adiabatna sprememba temperature Fe-Rh zlitine fazni prehod prvega reda izračuni prvih principov true false true Angleški jezik Slovenski jezik Članek v reviji 2026-08-17 14:41:33 2026-08-17 14:41:38 2026-08-18 04:04:47 0000-00-00 00:00:00 2026 0 0 12 str. Vol. 1080, art. 190307 2026 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.56:669.15 0925-8388 10.1016/j.jallcom.2026.190307 287894019 Gimaev..._Giant_magnetocaloric....pdf Gimaev..._Giant_magnetocaloric....pdf 1 E0183414327159C5F52F7E7A8C9A6F05 922be61428f778a6b4632029d4c5abed405c88b6c4de9b72ab2a73db99d37027 fe93d487-9a38-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=244451 https://www.sciencedirect.com/science/article/pii/S0925838826043768 1 9cdef284-9a38-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=244450 Fakulteta za strojništvo 0 0 0