Study of a magnetic-cooling material Gd(OH)CO₃

Abstract

The magnetocaloric effect of orthorhombic Gd(OH)CO3 has been experimentally studied, which exhibits −ΔSm up to 66.4 J kg−1 K−1 (355 mJ cm−3 K−1) for ΔH = 7 T and T = 1.8 K.

Molecular Design for Cryogenic Magnetic Coolants

“…In order to weaken the relatively strong magnetic interactions via the hydroxyl bridges as well as lower the molecular weight per paramagnetic center, we carried out the VTVF measurements and heat capacity measurements for Gd(OH)CO 3 (32) [19] and GdF 3 (33, Figure 9), [20] which exhibit huge MCE in both gravimetric and volumetric units. For GdF 3 , the maximum of 2DS M was observed to be 74.…”

Magnetocaloric effect and thermal conductivity of Gd(OH)3 and Gd2O(OH)4(H2O)2

“…On one hand, their structural diversity and controllability facilitate us to adjust the magnetic interaction between the metal ions, leading to an MCE significantly larger than that of lanthanide alloys and magnetic nanoparticles; 4,5 On the other hand, using these kinds of magnetic materials as magnetic reagents can achieve ultra-low temperature, 3d due to their magnetic phase transition often occurring at extremely low temperature. 3b Among different types of magnetic materials, metal clusters and coordination polymers are especially notable.…”

Enhanced Magnetocaloric Effect from Cr Substitution in Ising Lanthanide Gallium Garnets Ln3CrGa4O12 (Ln = Tb, Dy, Ho)

“…[13] Of these, gadolinium gallium garnet (GGG), which shows no long-range ordering down to 25 mK, has been established as a MCM for magnetic refrigeration in the liquid helium temperature regime. The absence of long-range ordering, high density of magnetic ions, chemical stability, and lack of single ion anisotropy (L = 0 for Gd 3+ ) allowing for the full magnetic entropy (Rln[2J + 1] = 17.29 J K −1 mol Gd −1 ) to be extracted in high magnetic fields makes it an ideal MCM for T < 20 K. [14][15][16] In recent years, a number of Gd containing MCMs with better performance at 2 K have been reported [17][18][19][20] but GGG continues to be used and serves as the benchmark for MCMs in this temperature regime. However, for all the Gd-based magnetocalorics, the change in magnetic entropy is maximized in fields of 5 T or higher.…”

“…) to be extracted in high magnetic fields makes it an ideal MCM for T < 20 K. [14][15][16] In recent years, a number of Gd containing MCMs with better performance at 2 K have been reported [17][18][19][20] but GGG continues to be used and serves as the benchmark for MCMs in this temperature regime. However, for all the Gd-based magnetocalorics, the change in magnetic entropy is maximized in fields of 5 T or higher.…”