Magnetic cooling technology based on magnetocaloric effect (MCE) has attracted great interest in obtaining extremely low temperatures, for example, for space exploration. Here, we grew a new gadolinium‐rich orthoborate K₃Li₃Gd₇(BO₃)₉ (1) as a promising cryogenic magnetic coolant. It exhibits a complicated three dimensional framework constructed from BO₃ groups and gadolinium‐oxygen chains. The Gd−O chain consists of two types of clusters of Gd₃O₂₀ and Gd₃O₁₉ interconnection by Gd(4)O₈ polyhydron. Due to its high gadolinium concentration, a large −ΔS_m of 56.6 J kg⁻¹ K⁻¹ for 1 was obtained at 2 K and ΔH=7 T, much larger than that of the commercial benchmark Gd₃Ga₅O₁₂ (GGG) crystal (38.4 J kg⁻¹ K⁻¹), suggesting it to be an excellent MCE material.

中文翻译：

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K3Li3Gd7（BO3）9：一种用于低温磁性冷却的富含New的原硼酸酯

基于磁热效应（MCE）的磁冷却技术引起了人们对于获得极低温度（例如用于太空探索）的兴趣。在这里，我们种植了一种新的富含g的原硼酸K ₃ Li ₃ Gd ₇（BO ₃）₉（1）作为有前途的低温磁性冷却剂。它表现出由BO ₃基团和g-氧链构成的复杂的三维框架。Gd-O链由通过Gd（4）O ₈互连的Gd ₃ O ₂₀和Gd ₃ O ₁₉两种簇组成。多氢。由于其高浓度钆，大-Δ小号_米56.6Ĵ千克^-1  ķ ^-1为1在2 K和Δ得到ħ = 7 T，比商业基准的大得多的Gd ₃嘎₅ Ô ₁₂（GGG）晶体（38.4 J kg ^-1  K ^-1），表明它是出色的MCE材料。