Magnetic properties and giant cryogenic magnetocaloric effect in B-site ordered antiferromagnetic Gd2MgTiO6 double perovskite oxide

被引：232
作者：
Zhang, Yikun [1 ,2 ,3 ,4 ,5 ]
Tian, Yun [2 ,3 ,4 ]
Zhang, Zhenqian [5 ]
Jia, Youshun [5 ]
Zhang, Bin [2 ,3 ,4 ]
Jiang, Minqiang [6 ]
Wang, Jiang [2 ,3 ,4 ]
Ren, Zhongming [2 ,3 ,4 ]
机构：
[1] Hangzhou Dianzi Univ, Sch Elect & Informat Engn, Hangzhou 310012, Peoples R China
[2] Shanghai Univ, State Key Lab Adv Special Steels, Shanghai 200444, Peoples R China
[3] Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200444, Peoples R China
[4] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
[5] Hangzhou Dianzi Univ, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310012, Peoples R China
[6] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
来源：
ACTA MATERIALIA | 2022年 / 226卷
基金：
中国国家自然科学基金;
关键词：
Magnetocaloric performances; Magnetic phase transition; Magnetocaloric (MC) effect; Rare earths based double perovskite oxides; ACHIEVEMENT; REFRIGERATION; PERFORMANCES;
D O I：
10.1016/j.actamat.2022.117669
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnetic refrigeration (MR) technology by utilizing the magnetocaloric (MC) effects of magnetic solids have been realized to be a promising energy efficiency and environmentally friendly technology. Developing or discovering proper magnetic solids with promising MC performances is one of the most important tasks at present stage since a huge gap still exists between the requirement of practical MR application and the MC performances of the magnetic solids. Herein, we reported a combined theoretical and experimental investigation of the crystal structure together with the magnetic properties, magnetic phase transition (MPT) and MC performances in Gd2MgTiO6 oxide. The Gd2MgTiO6 is confirmed to crystalize in a B-site ordered monoclinic double perovskite (DP) crystal structure. A rather unstable anti ferromagnetic (AFM) interaction with large magnetic moment and semi-conductor characteristic with the band gap of 2.977 eV have been confirmed in Gd2MgTiO6 DP oxide at ground state. Giant reversible cryogenic MC effect together with excellent MC performances have been confirmed by a series of the figure of merits including the values of maximum magnetic entropy change (-Delta S-M) and refrigerant capacity ( RC ), which are evaluated to be 46.21 J/kgK and 300.27 J/kg around 3.3 K with the magnetic change of 0-7 T, these values are much better than most of the recently reported famous cryogenic MC materials and the commercialized magnetic refrigerants gadolinium gallium garnet (GGG) as well. The observed excellent MC performances suggest that Gd2MgTiO6 DP oxide is a promising candidate material for cryogenic MR applications. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：9
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