Magnetic properties and large cryogenic magneto-caloric effect of Er0.2Tm0.2Ho0.2Cu0.2Co0.2 amorphous ribbon

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

“…[282] Wu et al [283] reported a pseudo-quaternary Fe 25 Co 25 Ni 25 (Mo 0.2 P 0.4 B 0.4 ) 25 high-entropy bulk metallic glass (HE-BMG), which shows a maximum |Δs m | of 0.98 J kg −1 K −1 for Δμ 0 H of 2 T around 560 K. Additionally, FeCoNiCuAlCr HEA thin films deposited by Vorobiov et al [284] [286] The maximum |Δs m | reaches 15.0 J kg −1 K −1 for Δμ 0 H of 5 T in the former. Interestingly, rare-earth-based HEAs in the form of microwires [287,288] and ribbons [289][290][291][292][293] fabricated by melt-extraction techniques show a better magnetocaloric performance (larger Δs m or wider temperature span) than their bulk counterparts. For instance, a large |Δs m | of 15.73 J kg −1 K −1 is obtained in Er 20 Tm 20 Ho 20 Cu 20 Co 20 amorphous ribbons for Δμ 0 H = 5 T, which is much larger than typical rare-earth-based BMGs.…”

“…For instance, a large |Δs m | of 15.73 J kg −1 K −1 is obtained in Er 20 Tm 20 Ho 20 Cu 20 Co 20 amorphous ribbons for Δμ 0 H = 5 T, which is much larger than typical rare-earth-based BMGs. [292] The second-generation magnetocaloric HEAs are characteristic of non-equiatomic compositions, which considerably extends the compositional space of HEAs. Sarlar et al [294,295] [295] hypothesize that the superior magnetocaloric performance of the Mn 27 Cr 7 Ni 33 Ge 25 Si 8 HEA originated from a combination of the unconventional crystal structure and the constituent elements.…”

“…[ 286 ] The maximum |Δ s m | reaches 15.0 J kg −1 K −1 for Δµ 0 H of 5 T in the former. Interestingly, rare‐earth‐based HEAs in the form of microwires [ 287,288 ] and ribbons [ 289–293 ] fabricated by melt‐extraction techniques show a better magnetocaloric performance (larger Δ s m or wider temperature span) than their bulk counterparts. For instance, a large |Δ s m | of 15.73 J kg −1 K −1 is obtained in Er 20 Tm 20 Ho 20 Cu 20 Co 20 amorphous ribbons for Δµ 0 H = 5 T, which is much larger than typical rare‐earth‐based BMGs.…”

“…For instance, a large |Δ s m | of 15.73 J kg −1 K −1 is obtained in Er 20 Tm 20 Ho 20 Cu 20 Co 20 amorphous ribbons for Δµ 0 H = 5 T, which is much larger than typical rare‐earth‐based BMGs. [ 292 ]…”

Magnetocaloric materials for hydrogen liquefaction

“…In recent years, HEA have evolved to include both intermetallic and ceramic compounds, even with less than five principal elements and in nonequimolar compositions (for further information, readers are recommended to refer to refs. 310,312,313 ΔH mix Magnetocaloric HEA with amorphous structures are generally designed following the early HEA concept, namely five or more principal elements in equiatomic concentrations, except their atomic radius and enthalpies of mixing (…”