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Enhanced magnetocaloric performances and tunable martensitic transformation in Ni_(35)Co_(15)Mn_(35-x)Fe_(x)Ti_(15) all-d-metal Heusler alloys by chemical and physical pressures

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Science China Materials 2022年第2期65卷 486-493页

作者： Yong Li Liang Qin Siyuan Huang Lingwei Li Key Laboratory of Novel Materials for Sensor of Zhejiang Province Institute of Advanced Magnetic MaterialsHangzhou Dianzi UniversityHangzhou 310018China

The solid-state magnetic cooling(MC)method based on the magnetocaloric effect(MCE)is recognized as an environmentally friendly and high-energy-efficiency *** search or design of suitable magnetic materials with large MCEs is one of the main targets at *** this work,we apply the chemical and hydrostatic pressures in the Ni_(35)Co_(15)Mn_(35-x)Fe_(x)Ti_(15) all-d-metal Heusler alloys and systematically investigate their crystal structures,phases,and magnetocaloric performances experimentally and *** the alloys are found to crystallize in an ordered B2-type structure at room temperature and the atoms of Fe are confirmed to all occupy at sites Mn(B).The total magnetic moments decrease gradually with increasing Fe content and decreasing of volume as *** martensitic transformation temperature decreases with the increase of Fe content,whereas increases with increasing hydrostatic ***,obviously enhanced magnetocaloric performances can also be obtained by applied *** maximum values of magnetic entropy change and refrigeration capacity are as high as 15.61(24.20)J(kg K)^(−1) and 109.91(347.26)J kg^(−1) withΔH=20(50)kOe,*** magnetocaloric performances are superior to most of the recently reported famous materials,indicating the potential application for active MC.

关键词： magnetocaloric performances magnetic properties pressure effects magnetocaloric effect all-d-metal Heusler alloys

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Magnetic properties and promising magnetocaloric performances in the antiferromagnetic GdFe_(2)Si_(2)compound

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Science China Materials 2022年第5期65卷 1345-1352页

作者： Yikun Zhang Jian Zhu Shuo Li Zhenqian Zhang Jiang Wang Zhongming Ren School of Electronics and Information Engineering Hangzhou Dianzi UniversityHangzhou 310012China State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Key Laboratory of Novel Materials for Sensor of Zhejiang Province Hangzhou Dianzi UniversityHangzhou 310012China

The magnetocaloric(MC) effect-based solidstate magnetic refrigeration(MR) technology has been recognized as an alternative novel method to the presently commercialized gas compression technology. Searching for suitable candidates with promising MC performances is one of the most urgent tasks. Herein, combined experimental and theoretical investigations on the magnetic properties, magnetic phase transition, and cryogenic MC performances of Gd Fe_(2)Si_(2)have been performed. An unstable antiferromagnetic(AFM) interaction in the ground state has been confirmed in Gd Fe_(2)Si_(2). Moreover, a huge reversible cryogenic MC effect and promising MC performances in Gd Fe_(2)Si_(2)have been *** maximum isothermal magnetic entropy change, temperature-averaged entropy change with 2 K lift, and refrigerant capacity for Gd Fe_(2)Si_(2)were 30.01 J kg^(-1)K^(-1),29.37 J kg^(-1)K^(-1), and 328.45 J kg^(-1)at around 8.6 K with the magnetic change of 0–7 T, respectively. Evidently, the values of these MC parameters for the present AFM compound Gd Fe_(2)Si_(2)are superior to those of most recently reported rareearth-based MC materials, suggesting the potential application for active cryogenic MR.

关键词： rare earths antiferromagnetic GdFe_(2)Si_(2)compound magnetocaloric performances cryogenic magnetic refrigeration magnetic phase transition

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Recent progress in the development of RE_(2)TMTM’O_(6)double perovskite oxides for cryogenic magnetic refrigeration

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Journal of Materials Science & Technology 2023年第5期136卷 1-12页

作者： Lingwei Li Mi Yan Key Laboratory of Novel Materials for Sensor of Zhejiang Province Institute of Advanced Magnetic MaterialsHangzhou Dianzi UniversityHangzhou 310012China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

The magnetic functional materials play a particularly important role in our modern society and daily *** magnetocaloric effect(MCE)is at the basis of a solid state magnetic refrigeration(MR)technology which may enhance the efficiency of cooling systems,both for room temperature and cryogenic *** numerous experimental and theoretical MCE studies,commercial MR systems are still at developing *** magnetic solids with outstanding magnetocaloric performances remains therefore a most urgent ***,recent progresses on characterizing the crystal structure,magnetic properties and cryogenic MCE of rare earths(RE)-based RE_(2)TMTM’O_(6)double perovskite(DP)oxides,where TM and TM’are different 3d transition metals,are *** Gd-based DP oxides are found to exhibit promising cryogenic magnetocaloric performances which make them attractive for active MR ap-plications.

关键词： magnetocaloric effect(MCE) Rare earths Double perovskite(DP)oxides Magnetic functional materials Cryogenic magnetic refrigeration magnetocaloric performances

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Achievement of giant cryogenic refrigerant capacity in quinary rare-earths based high-entropy amorphous alloy

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Journal of Materials Science & Technology 2022年第7期102卷 66-71页

作者： Yikun Zhang Jian Zhu Shuo Li Jiang Wang Zhongming Ren State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

Magnetic refrigeration(MR)by utilizing the magnetocaloric(MC)effect is recognized as one of the most potential promising solid state environmentally friendly and high efficiency alternative method to the well-used state-of-the-art gas compression cooling *** this work,a systematic investigation of quinary equi-atomic rare-earths(RE)based Er_(20) Ho_(20) Gd_(20) Ni_(20) Co_(20) high-entropy(HE)amorphous alloy in terms of the microstructure,magnetic and magnetocaloric(MC)properties have been *** Er_(20) Ho_(20) Gd_(20) Ni_(20) Co_(20) exhibits promising glass forming ability with an undercooled liquid region of 72 *** cryogenic MC performances can be found in wide temperature from∼25 and∼75 K,close to H_(2) and N_(2) liquefaction,*** from the largest magnetic entropy change(-S M)reaches 17.84 J/(kg K)with 0-7 T magnetic field change,corresponding refrigerant capacity(RC)attains a giant value of 1030 J/*** promising cryogenic MC performances together with the unique HE amorphous characterizations make the quinary Er_(20) Ho_(20) Gd_(20) Ni_(20) Co_(20) HE amorphous alloy attractive for cryogenic MR applications.

关键词： HE-amorphous ribbons magnetocaloric performances Rare earths Magnetic properties Giant refrigerant capacity

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