Magnetocaloric effect of high-entropy rare-earth alloy GdTbHoErY

摘要

Magnetocaloric effect of a single-phase high-entropy rare-earth alloy GdTbHoErY with the hexagonal close-packed (HCP) structure was studied. As the external field increases, the peak isothermal magnetic entropy change (Delta S-M) of the alloy is accompanied by a hump, which widens the Delta S-M peak and thus increases the refrigerant capacity (RC) value. Under a magnetic field of 5 T, the RC and the Delta S-M reach 453 J kg(-1) and 5.4 J kg(-1) K-1, respectively. The high RC for the high-entropy alloy is mainly attributed to the wider working temperature range. Moreover, the random distribution of atoms in the lattice leads to a complex magnetic structure and exchange coupling in this alloy. This feature of high-entropy alloy GdTbHoErY makes a gradual change in the magnetic sequence, which leads to an enhanced magnetocaloric effect.

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