TY - JOUR
T1 - Adiabatic demagnetization refrigeration to mK temperatures in NaGdGeO4 crystal
AU - Chen, Zuhua
AU - Liu, Xinyang
AU - Shen, Jun
AU - Wang, Dunhui
AU - Zhang, Guochun
AU - Xi, Lei
AU - Liu, Xiansong
AU - Kan, Xucai
AU - Wang, Changkun
AU - Zhang, Yicai
AU - Gao, Jiahao
AU - Zhao, Yanan
AU - Li, Zhenxing
AU - Xiang, Junsen
AU - Li, Wei
AU - Tu, Heng
N1 - Publisher Copyright:
Copyright © 2025. Published by Elsevier Inc.
PY - 2025/12/1
Y1 - 2025/12/1
N2 - Adiabatic demagnetization refrigeration (ADR) technology is regarded as an effective, easy and sustainable method to replace evaporation or dilution cooling of 3He/4He. In practical applications, it is important for magnetic refrigeration materials to possess excellent magnetocaloric effect (MCE) under a small applied field, which is advantageous to further simplifying design and reducing costs. In this article, the centimeter-scaled crystal of NaGdGeO4 is grown by top seed crystal method. The magnetic performance and MCE of NaGdGeO4 compound are investigated. NaGdGeO4 exhibits a low phase transition temperature of 0.7 K, indicating its potential as an ultra-low temperature magnetic refrigerant. Large magnetic entropy changes of 16.7 and 34.5 J·kg-1·K-1 are obtained under small field changes of 1 and 2 T at 0.8 and 1.2 K, respectively, which is almost 2 times larger than that of commercial magnetic refrigerant Gd3Ga5O12 under the same conditions. For the measurement of quasi-ADR, when initial conditions are μ 0 H =6 T, T = 2 K, the temperature trace of non-oriented crystal and powder samples passe a minimum value of 132.5 mK and 157.9 mK, respectively. These outstanding performances suggest that NaGdGeO4 is a promising candidate for ultra-low temperature magnetic refrigeration applications.
AB - Adiabatic demagnetization refrigeration (ADR) technology is regarded as an effective, easy and sustainable method to replace evaporation or dilution cooling of 3He/4He. In practical applications, it is important for magnetic refrigeration materials to possess excellent magnetocaloric effect (MCE) under a small applied field, which is advantageous to further simplifying design and reducing costs. In this article, the centimeter-scaled crystal of NaGdGeO4 is grown by top seed crystal method. The magnetic performance and MCE of NaGdGeO4 compound are investigated. NaGdGeO4 exhibits a low phase transition temperature of 0.7 K, indicating its potential as an ultra-low temperature magnetic refrigerant. Large magnetic entropy changes of 16.7 and 34.5 J·kg-1·K-1 are obtained under small field changes of 1 and 2 T at 0.8 and 1.2 K, respectively, which is almost 2 times larger than that of commercial magnetic refrigerant Gd3Ga5O12 under the same conditions. For the measurement of quasi-ADR, when initial conditions are μ 0 H =6 T, T = 2 K, the temperature trace of non-oriented crystal and powder samples passe a minimum value of 132.5 mK and 157.9 mK, respectively. These outstanding performances suggest that NaGdGeO4 is a promising candidate for ultra-low temperature magnetic refrigeration applications.
KW - Centimeter-scaled crystal
KW - Low-field magnetocaloric effect
KW - Quasi-ADR measurement
KW - Ultra-low temperature
UR - https://www.scopus.com/pages/publications/105023205895
U2 - 10.1016/j.actamat.2025.121585
DO - 10.1016/j.actamat.2025.121585
M3 - Article
AN - SCOPUS:105023205895
SN - 1359-6454
VL - 301
JO - Acta Materialia
JF - Acta Materialia
M1 - 121585
ER -