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]; Yang, Yang[1]; Hou, Chunjuan[3]; Guo, Dan[1]; Li, Xi[1]; Ren, Zhongming[1]; Wilde, Gerhard[2]

第一作者：Zhang, Yikun

通讯作者：Zhang, Yikun

机构：[1] State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China; [2] Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Stra?e 10, Münster, D-48149, Germany; [3] Beijing Key Laboratory of Biomass Waste Resource Utilization, Biochemical Engineering College, Beijing Union University, Beijing, 100023, China

第一机构：State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China

通讯机构：[1]State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China

年份：2018

卷号：94

起止页码：17-21

外文期刊名：Intermetallics

收录：EI(收录号：20175204575445);Scopus(收录号：2-s2.0-85038855861)

语种：英文

外文关键词：Ferromagnetism - Specific heat - Cobalt alloys - Energy dispersive spectroscopy - Magnetization - Magnetocaloric effects - Rietveld refinement - Ferromagnetic materials - Antiferromagnetism - Entropy - Frequency modulation - Manganese alloys - Gallium alloys - Gallium compounds - Scanning electron microscopy

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 Immm space group. Both compounds are ordering antiferromagnetically 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, ΔSM) under low magnetic field changes (ΔH) and at low temperatures together with a large normal reversible magnetocaloric effect under high ΔH. The positive ΔSM below/at the Néel temperatures (TN) is ascribed to first order transition from antiferromagnetic (AFM) to ferromagnetic (FM) states, whereas the negative ΔSM 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 (?ΔSMmax), 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. ? 2017 Elsevier Ltd