Magnetocaloric effect of high-entropy rare-earth alloy GdTbHoErY

作者：Lu, S. F.; Ma, L.^*; Rao, G. H.^*; Wang, J.; Du, Y. S.; Li, L.; Zhao, J. T.; Zhong, X. C.; Liu, Z. W.

来源：Journal of Materials Science: Materials in Electronics , 2021, 32(8): 10919-10926.

DOI：10.1007/s10854-021-05749-1

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.

• 单位
  桂林电子科技大学