An excellent cryogenic magnetic cooler: magnetic and magnetocaloric study of an inorganic frame material†,Materials Chemistry Frontiers

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An excellent cryogenic magnetic cooler: magnetic and magnetocaloric study of an inorganic frame material†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-10-01 00:00:00 , DOI: 10.1039/c8qm00439k
Yue Han _{1,

2,

3,

4} , Song-De Han _{1,

2,

3,

4} , Jie Pan _{1,

2,

3,

4} , Yu-Juan Ma _{1,

2,

3,

4} , Guo-Ming Wang _{1,

2,

3,

4}

Affiliation

The cryogenic magnetic coolers based on the magnetocaloric effect (MCE) of paramagnetic compounds usually need relatively large fields to realise a practical cooling performance. Thus, it is of significance to search for molecule-based cryogenic magnetic coolers with high performance of the MCE under low fields (smaller than 2 T), considering the ready availability of low fields by commercial Nd–Fe–B permanent magnets. In this work, the crystal structure, magnetic susceptibility and isothermal magnetization for the inorganic compound Gd(OH)SO₄ (1) have been investigated. The title compound exhibits a 3D structure with Gd-oxygen chains as the supramolecular building units. Magnetic characterisations indicated that adjacent Gd^III ions show weak magnetic couplings in 1. Because of the integration of large metal/ligand mass ratio, weak magnetic couplings and a dense framework, the observed maximum entropy change (−ΔS^max_m) for 1 was up to 53.5 J kg⁻¹ K⁻¹ or 276 mJ cm⁻³ K⁻¹ for ΔH = 7 T and T = 2 K, comparable to the performance of commercial gadolinium gallium garnet Gd₃Ga₅O₁₂ (GGG, −ΔS^max_m = 38.4 J kg⁻¹ K⁻¹ or 272 mJ cm⁻³ K⁻¹ with ΔH = 7 T). Notably, the −ΔS^max_m of 1 still reaches 27.5 J kg⁻¹ K⁻¹ at T = 2 K and ΔH = 2 T, and 38.3 J kg⁻¹ K⁻¹ at T = 2 K and ΔH = 3 T, which already surpasses GGG (about 24 J kg⁻¹ K⁻¹ with ΔH = 3 T) and makes 1 a superior cryogenic magnetic cooler for low-temperature applications, even in low fields.

中文翻译：

出色的低温磁性冷却器：对无机框架材料的磁性和磁热研究†

基于顺磁性化合物的磁热效应（MCE）的低温磁性冷却器通常需要相对较大的磁场才能实现实用的冷却性能。因此，考虑到商用Nd-Fe-B永磁体已经可以提供低磁场，寻找在低磁场（小于2 T）下具有高性能MCE的基于分子的低温磁冷却器具有重要意义。在这项工作中，研究了无机化合物Gd（OH）SO ₄（1）的晶体结构，磁化率和等温磁化强度。标题化合物表现出具有作为超分子构建单元的Gd-氧链的3D结构。磁特性表明邻近的Gd ^III离子在1中显示出弱磁耦合。由于大的金属/配位体的质量比，弱磁耦合和致密框架，所观察到的最大熵变（-Δ一体化的小号^最大_米为）1达53.5公斤Ĵ ^-1 ķ ^-1或276毫焦耳厘米^{- 3} ķ ^-1为Δ ħ = 7 T和Ť = 2 K，比得上商业钆镓石榴石Gd组成的性能₃嘎₅ ø ₁₂（GGG，-Δ小号^最大_米= 38.4Ĵ千克^-1 ķ ^-1或272立方厘米^-3 K^-1（ ΔH = 7 T）。值得注意的是，-Δ š^最大_米的1仍然达到27.5Ĵ千克^-1 ķ^-1在Ť = 2 K和Δ ħ = 2 T，和38.3Ĵ千克^-1 ķ^-1在Ť = 2 K和Δ ħ = 3 T，这已经超过GGG（约24公斤Ĵ^-1 ķ^-1与Δ ħ = 3 T），使1对低温应用的优良的低温磁冷却器，即使在低的字段。

更新日期：2018-10-01

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