Enhancement of giant refrigerant capacity in Ho${}_{1-x}$Gd${}_x$B${}_2$ alloys (0.1 $\le$ x $\le$ 0.4)

Abstract

Intending to optimize the giant magnetocaloric properties of HoB${}_2$, we synthesized and magnetocalorically characterized Ho${}_{1-x}$Gd${}_x$B${}_2$(0.1 $\le$ x $\le$ 0.4) alloys. We found out that Gd enters stoichiometrically and randomly into the Ho site, leading to a Vegard-type structural change. The addition of spherical S${}^{7/2}$ Gd${}^{3+}$ moments prompts an enhancement in Curie temperature, a reduction in peak value of the magnetic entropy change while still being relatively high, and a broadening of the magnetic entropy change curves. The overall influence is a relatively high refrigerant capacity and relative cooling power, and an extension of the thermal working range to higher temperatures; thus, electing Ho${}_{1-x}$Gd${}_x$B${}_2$(as potential candidates for cryogenic refrigeration applications.

12 pages, 4 figures and 1 table

References in corpus (2)

• Machine Learning Guided Discovery of Gigantic Magnetocaloric Effect in HoB${}_2$ Near Hydrogen Liquefaction Temperature
• Effect of Dy substitution in the giant magnetocaloric properties of HoB${}_2$

Cited by in corpus (1)

• Experimental exploration of ErB${}_2$ and SHAP analysis on a machine-learned model of magnetocaloric materials for materials design