TY - JOUR
T1 - Giant low-field magnetocaloric effect in ferromagnetically ordered Er1–xTmxAl2 (0 ≤ x ≤ 1) compounds
AU - Yang, Shuxian
AU - Zheng, Xinqi
AU - Wang, Dingsong
AU - Xu, Juping
AU - Yin, Wen
AU - Xi, Lei
AU - Liu, Chaofan
AU - Liu, Jun
AU - Xu, Jiawang
AU - Zhang, Hu
AU - Xu, Zhiyi
AU - Wang, Lichen
AU - Yao, Yihong
AU - Zhang, Maosen
AU - Zhang, Yichi
AU - Shen, Jianxin
AU - Wang, Shouguo
AU - Shen, Baogen
N1 - Publisher Copyright:
© 2022
PY - 2023/5/20
Y1 - 2023/5/20
N2 - Magnetocaloric material is the key working substance for magnetic refrigerant technology, for which the low-field and low-temperature magnetocaloric effect (MCE) performance is of great importance for practical applications at low temperatures. Here, a giant low-field magnetocaloric effect in ferromagnetically ordered Er1–xTmxAl2 (0 ≤ x ≤ 1) compounds was reported, and the magnetic structure was characterized based on low-temperature neutron powder diffraction. With increasing Tm content from 0 to 1, the Curie temperature of Er1–xTmxAl2 (0 ≤ x ≤ 1) compounds decreases from 16.0 K to 3.6 K. For Er0.7Tm0.3Al2 compound, it showed the largest low-field magnetic entropy change (–ΔSM) with the peak value of 17.2 and 25.7 J/(kg K) for 0–1 T and 0–2 T, respectively. The (–ΔSM)max up to 17.2 J/(kg K) of Er0.7Tm0.3Al2 compound for 0–1 T is the largest among the intermetallic magnetocaloric materials ever reported at temperatures below 20 K. The peak value of adiabatic temperature change (ΔTad)max was determined as 4.13 K and 6.87 K for 0–1 T and 0–2 T, respectively. The characteristic of second-order magnetic transitions was confirmed on basis of Arrott plots, the quantitative criterion of exponent n, rescaled universal curves, and the mean-field theory criterion. The outstanding low-field MCE performance with low working temperatures indicates that Er1–xTmxAl2 (0 ≤ x ≤ 1) compounds are promising candidates for magnetic cooling materials at liquid hydrogen and liquid helium temperatures.
AB - Magnetocaloric material is the key working substance for magnetic refrigerant technology, for which the low-field and low-temperature magnetocaloric effect (MCE) performance is of great importance for practical applications at low temperatures. Here, a giant low-field magnetocaloric effect in ferromagnetically ordered Er1–xTmxAl2 (0 ≤ x ≤ 1) compounds was reported, and the magnetic structure was characterized based on low-temperature neutron powder diffraction. With increasing Tm content from 0 to 1, the Curie temperature of Er1–xTmxAl2 (0 ≤ x ≤ 1) compounds decreases from 16.0 K to 3.6 K. For Er0.7Tm0.3Al2 compound, it showed the largest low-field magnetic entropy change (–ΔSM) with the peak value of 17.2 and 25.7 J/(kg K) for 0–1 T and 0–2 T, respectively. The (–ΔSM)max up to 17.2 J/(kg K) of Er0.7Tm0.3Al2 compound for 0–1 T is the largest among the intermetallic magnetocaloric materials ever reported at temperatures below 20 K. The peak value of adiabatic temperature change (ΔTad)max was determined as 4.13 K and 6.87 K for 0–1 T and 0–2 T, respectively. The characteristic of second-order magnetic transitions was confirmed on basis of Arrott plots, the quantitative criterion of exponent n, rescaled universal curves, and the mean-field theory criterion. The outstanding low-field MCE performance with low working temperatures indicates that Er1–xTmxAl2 (0 ≤ x ≤ 1) compounds are promising candidates for magnetic cooling materials at liquid hydrogen and liquid helium temperatures.
KW - Low field magnetocaloric effect
KW - Magnetic structure
KW - Magnetocaloric effect
KW - RAl compounds
UR - http://www.scopus.com/inward/record.url?scp=85144825824&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2022.10.066
DO - 10.1016/j.jmst.2022.10.066
M3 - Article
AN - SCOPUS:85144825824
SN - 1005-0302
VL - 146
SP - 168
EP - 176
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -