College of Civil and Transportation Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Inorg Chem. 2023 Apr 3;62(13):5282-5291. doi: 10.1021/acs.inorgchem.3c00421. Epub 2023 Mar 21.
Searching for working refrigerant materials is the key element in the design of magnetic cooling devices. Herein, we report on the thermodynamic and magnetocaloric parameters of an phase oxyorthosilicate, GdSiO, by field-dependent static magnetization and specific heat measurements. An overall correlation strength of || ≈ 3.4 K is derived via the mean-field estimate, with antiferromagnetic correlations between the ferromagnetically coupled Gd-Gd layers. The magnetic entropy change -Δ is quite impressive, reaches 0.40 J K cm (58.5 J K kg) at = 2.7 K, with the largest adiabatic temperature change = 23.2 K for a field change of 8.9 T. At = 20 K, the lattice entropy is small enough compared to the magnetic entropy , / = 21.3, which warrants its potential in 2 -20 K cryocoolers with both the Stirling and Carnot cycles. Though with relatively large exchange interactions, the layered A-type spin arrangement ultimately enhances the magnetocaloric coupling, raising the possibilities of designing magnetic refrigerants with a high ratio of cooling capacity to volume.
寻找可用的制冷剂材料是设计磁制冷设备的关键要素。在此，我们通过磁场依赖的静态磁化和比热测量报告了相氧硅钆酸盐 GdSiO 的热力学和磁热参数。通过平均场估计得出整体关联强度||≈3.4 K，其中铁磁耦合 Gd-Gd 层之间存在反铁磁关联。磁熵变化-Δ非常显著，在 = 2.7 K 时达到 0.40 J K cm（58.5 J K kg），对于 8.9 T 的磁场变化，最大绝热温度变化Δ = 23.2 K。在 = 20 K 时，晶格熵与磁熵相比足够小，/ = 21.3，这保证了它在 2-20 K 低温冷却器中具有斯特林和卡诺循环的潜力。尽管存在相对较大的交换相互作用，但层状 A 型自旋排列最终增强了磁热耦合，提高了设计具有高冷却能力与体积比的磁制冷剂的可能性。
