Large magnetic entropy change in weberite-type oxides Gd_3MO_7 (M = Nb,Sb,and Ta)
Large magnetic entropy change in weberite-type oxides Gd_3MO_7 (M = Nb,Sb,and Ta)
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韦伯石型氧化物 Gd_3MO_7 (M = Nb、Sb 和 Ta) 中的大磁熵变
DOI：
10.1007/s11433-021-1834-4
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Zeng Yujia
中科院分区：
文献类型：
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作者：
Yang Ziyu;Qin Shijun;Ye Xubin;Liu Zhehong;Guo Yujie;Cui Hongzhi;Ge Junyi;Li Hui;Long Youwen;Zeng Yujia
本文通过粉末X射线衍射、体磁化率和热容测量，报道了韦氏矿型氧化物Gd_3Mo_7(M=Nb，Sb和Ta)的结构、磁性能和低温磁热效应。Gd_3SbO_7在2.0K、9T的外场下观察到了相当大的354.0 mJ K~(-1)cm~(-3)的等温磁熵变化。在8.9T的外场下，相对制冷功率为618.9 J kg~(-1)(4.8J cm~(-3))，在6.3K时绝热温变最大为22.4K。与基准磁致冷剂相比，这些氧化物的磁热性能相当令人印象深刻。因此，Gd_3Mo_7(M=Nb，Sb，Ta)是一种很有前途的低温冷却技术，特别是在氦的磁液化方面。
In the present work,the structure,magnetic properties,and cryogenic magnetocaloric effect of weberite-type oxides Gd_3MO_7 (M = Nb,Sb,and Ta) are reported through powder X-ray diffraction,bulk susceptibility,and heat capacity measurements,as well as scaling law analysis and a mean-field approach.A remarkably large isothermal magnetic entropy change of 354.0 mJ K~(-1) cm~(-3) is observed for Gd_3SbO_7 under an external field of 9 T at 2.0 K.The relative cooling power is estimated to be 618.9 J kg~(-1) (4.8 J cm~(-3)) for an applied field of 8.9 T,with the largest adiabatic temperature change being 22.4 K at 6.3 K.The magnetocaloric performance of these oxides is quite impressive when compared with the benchmark magnetic refrigerant,gadolinium gallium garnet (Gd_3Ga_5O_(12),GGG).Therefore,Gd_3MO_7 (M = Nb,Sb,and Ta) are promising alternatives for cryogenic cooling techniques,especially for the magnetic liquefaction of helium.