摘要
本文以X射线粉末衍射谱、等温磁化曲线和等磁场变温曲线为基础,研究了Er-Fe-In三元系773 K等温截面相图与Er_(12)Fe_(2)In_(3)化合物的磁性。结果表明:该三元系中只有一个三元化合物Er_(12)Fe_(2)In_(3)存在,且二元化合物与三元化合物均未观察到固溶现象。化合物的磁性研究表明,低场下Er_(12)Fe_(2)In_(3)合金分别在10 K出现了一个正常反铁磁-顺磁相变以及在36 K出现一个类似反铁磁-顺磁的磁相变。磁化过程中存在磁场诱导反铁磁-铁磁相变,在2 T以上磁场中该合金只在居里温度约12 K时存在铁磁-顺磁相变。在0~5 T磁场范围内,合金的最大等温磁熵变(-ΔSMax)为9.9 J/(kg·K),在等温磁熵变最大值半高宽ΔTcycl=38.0 K(5.7~43.7 K)范围内,其相对制冷能力为278.1 J/kg。
The isothermal section of the Er-Fe-In system at 773 K was constructed by X-ray powder diffraction(XRD)in this paper.One known ternary compound,Er12 Fe2 In3 has been confirmed.At the same time,Solid solutions were not detected in Er-Fe-In system at 773 K.The magnetic transition and magnetocaloric effect of Er12 Fe2 In3 alloy were investigated by magnetic susceptibility and isothermal magnetization measurements.One normal antiferromagnetic-paramagnetic transition and another abnormal one occur at 10 K and 36 K in ground state,respectively.Due to the field-induced antiferromagnetic-ferromagnetic states at/below the Neel,there is only a second order ferromagnetic-paramagnetic with TC=12 K in a high field.The maximum entropy change(-ΔSMax)values are-9.9 J/(kg·K)near TC.In the magnetic field range of 0-5 T,the reversible RCP corresponding to negative entropy change is 278.1 J/kg in an wide operating temperature regionΔTcycl=38 K,from 5.7 K to 43.7 K.
作者
陈湘
倪超
段宇静
CHEN Xiang;NI Chao;DUAN Yu-jing(College of Physics and Electronic Information Engineering,Neijiang Normal University,Neijiang 641100,China;The Ames Laboratory,Department of Energy of the Unite States,Iowa State University,Ames,Iowa 50011-2416,USA)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2021年第6期1559-1567,共9页
The Chinese Journal of Nonferrous Metals
基金
四川省科技厅资助项目(2017JY0182)。
