Gd3TeBO9: A Rare‐Earth Borate with Significant Magnetocaloric Effect

Magnetic refrigeration technology based on Gd‐based paramagnets is expected to be applied to refrigeration in extremely low temperatures, thereby reducing the consumption of liquid helium. Here, we obtained a compound, Gd3TeBO9 with high Gd3+ concentration through element substitution. The Gd3+ concentration in this compound is as high as 2.4×1024 ions/kg, which is 33 % higher than the commercial Gd3Ga5O12 (GGG), and further magnetic tests show that Gd3TeBO9 has a large magnetic entropy change (57.44 J/(kg K) and 408 mJ/(cm3 K) at 2.6 K and 7 T), which is 1.5 times that of GGG, implying the possibility of its further development as an potential magnetocaloric material. A gadolinium‐based oxide Gd3TeBO9 with high Gd content and excellent magnetocaloric effect is described.