文献类型：期刊文献

英文题名：Metamagnetic transition and magnetocaloric properties in antiferromagnetic Ho2Ni2Ga and Tm2Ni2Ga compounds

作者：Zhang, Yikun[1,2,3,4];Yang, Yang[1,2,3];Hou, Chunjuan[5];Guo, Dan[1,2,3];Li, Xi[1,2,3];Ren, Zhongming[1,2,3];Wilde, Gerhard[4]

第一作者：Zhang, Yikun

通讯作者：Zhang, YK[1];Zhang, YK[2];Zhang, YK[3]

机构：[1]Shanghai Univ, State Key Lab Adv Special Steels, Shanghai 200072, Peoples R China;[2]Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200072, Peoples R China;[3]Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China;[4]Univ Munster, Inst Mat Phys, Wilhelm Klemm Str 10, D-48149 Munster, Germany;[5]Beijing Union Univ, Biochem Engn Coll, Beijing Key Lab Biomass Waste Resource Utilizat, Beijing 100023, Peoples R China

第一机构：Shanghai Univ, State Key Lab Adv Special Steels, Shanghai 200072, Peoples R China

通讯机构：[1]corresponding author), Shanghai Univ, State Key Lab Adv Special Steels, Shanghai 200072, Peoples R China;[2]corresponding author), Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200072, Peoples R China;[3]corresponding author), Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China.

年份：2018

卷号：94

起止页码：17-21

外文期刊名：INTERMETALLICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000425579200003)】；

基金：The present work was supported by the National Natural Science Foundation of China (Nos. 51501036 and 51690160), Independent Research and Development Project of State Key Laboratory of Advanced Special Steel, Shanghai University, and United Innovation Program of Shanghai Commercial Aircraft Engine (Nos. AR910 and AR911).

语种：英文

外文关键词：Ho2Ni2Ga and Tm2Ni2Ga; Structure; Magnetocaloric effect; Metamagnetic transition; Magnetic refrigeration

摘要：The structure, magnetic transition and magnetocaloric properties in the ternary gallium intermetallic compounds of Ho2Ni2Ga and Tm2Ni2Ga have been systematically investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and magnetization measurements. As found from powder XRD and Rietveld refinement, Ho2Ni2Ga and Tm2Ni2Ga crystallized in an orthorhombic structure of the W2B2Co type belonging to the Inunm space group. Both compounds are ordering anti-ferromagnetically at low temperatures and under low magnetic fields together with a field-induced metamagnetic transition from antiferromagnetic (AFM) to ferromagnetic (FM). Peculiar and similar magnetocaloric properties are observed for both compounds, i.e., an inverse magnetocaloric effect (positive magnetic entropy change, Delta S-M) under low magnetic field changes (AM and at low temperatures together with a large normal reversible magnetocaloric effect under high Delta H. The positive Delta S-M below/at the Neel temperatures (T-N) is ascribed to first order transition from antiferromagnetic (AFM) to ferromagnetic (FM) states, whereas the negative Delta S-M above TN is due to the fact of the magnetic transition from paramagnetic (PM) to ferromagnetic (FM) states. Based on the field-dependent magnetization data, the maximum magnetic entropy change (-Delta S-M(max)), relative cooling power (RCP) and refrigerant capacity (RC) are established, and the corresponding values are 9.6 J/kg K, 276 J/kg and 206 J/kg for Ho2Ni2Ga, and are 4.3 J/kg K, 60 J/kg and 46 J/kg for Tm2Ni2Ga, respectively, for a magnetic field change of 0-70 kOe.