Magnetocaloric Effect of Two Gd-Based Frameworks

Abstract

Magnetic refrigeration material is the key to adiabatic demagnetization refrigeration technology. In this work, two magnetic refrigerants, Gd5(C4O4)(HCOO)3(CO3)2(OH)6·2.5H2O (1) and Gd2(OH)4SO4 (2), were prepared through hydrothermal reaction. Magnetic study reveals that their magnetic entropy changes are 24.8 J kg−1 K−1 for 1 and 15.1 J kg−1 K−1 for 2 at 2 K and 2 T, respectively. The magnetic entropy changes of 1 and 2 at T = 2 K and ∆H = 2 T exceed most gadolinium hydroxyl compounds, indicating that magnetic refrigerants with large magnetic entropy changes at low magnetic fields can be obtained by introducing more weak magnetic exchange ligands to replace hydroxyl groups in gadolinium hydroxyl compounds.

Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

“…Gd, or Gadolinium, is the representative material for a room-temperature MC material because it has a high magnetocaloric effect of 7.6 μ B per atom near room temperature (since Curie temperature of Gd is 294 K). Due to its near-room-temperature applications, researchers in this field are eagerly developing practical Gd-based MC thermal managing devices for medical implants and wearable devices [151][152][153][154]. For instance, Ba et al fabricated a free-standing polycrystalline Gd flexible film with a smooth surface that can bend reversibly with no MC properties degradation.…”