We report here the magnetic interactions, magnetocaloric effect and thermodynamic parameters of an efficient magnetic refrigerant material, Gd₂GeO₅, through magnetization and heat capacity measurements, as well as a mean-field and scaling analysis approach. An isotropic antiferromagnetic exchange coupling with energy scale ε_ex = J_exS² ≈ 2.6 K is estimated from analysing the magnetization dependences, in agreement with the couplings derived from the density functional theory (DFT). The Gd₂GeO₅ shows an exceptionally large isothermal magnetic entropy change of 0.36 J K⁻¹ cm⁻³ (50.3 J K⁻¹ kg⁻¹) and relative cooling power of 4.34 J cm⁻³ (611.3 J kg⁻¹) for a field change of 8.9 T, with the highest adiabatic temperature change being 22.2 K, which is quite impressive for use in helium-free magnetic cryocoolers.

我们在这里通过磁化和热容量测量以及平均场和比例分析方法报告了高效磁性制冷剂材料 Gd ₂ GeO _{5的磁相互作用、磁热效应和热力学参数。}通过分析磁化依赖性估计具有能量标度ε _ex  =  J _ex S ² ≈ 2.6 K的各向同性反铁磁交换耦合，这与源自密度泛函理论 (DFT) 的耦合一致。Gd ₂ GeO _{5显示出0.36 J K} ^-1  cm ^-3的异常大的等温磁熵变化(50.3 J K ^-1  kg ^{-1 ) 和 4.34 J cm -3} (611.3 J kg ^-1 ) 的相对冷却功率，场变化为 8.9 T，绝热温度变化最高为 22.2 K，使用起来非常令人印象深刻在无氦磁制冷机中。