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Experimental isothermal section phase diagram of Ho-Fe-In at 773 K and magnetic properties of Ho_(12)Fe_(2.08)In_(2.92) alloy 被引量:1
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作者 Xiang Chen Chao Ni 《Rare Metals》 SCIE EI CAS CSCD 2021年第4期987-994,共8页
The isothermal section of the Ho-Fe-In system at 773 K has been constructed by X-ray powder diffraction.One known structure ternary compound Er_(12)Fe_(2) In_(3)-type Ho_(12)Fe_(2) In_(3) has been confirmed.At the sam... The isothermal section of the Ho-Fe-In system at 773 K has been constructed by X-ray powder diffraction.One known structure ternary compound Er_(12)Fe_(2) In_(3)-type Ho_(12)Fe_(2) In_(3) has been confirmed.At the same time,solid solutions are not detected in Ho-Fe-In system at 773 K.The magnetic transition and magnetocaloric effect of Ho_(12)Fe_(2.08)In_(2.92) alloy with Er_(12)Fe_(2) In_(3)-type structure were investigated by magnetic susceptibility and isothermal magnetization measurements.One normal antiferromagnetic-paramagnetic transition and another abnormal one are discovered at 18 and 76 K in ground state,respectively.Owing to a first-order field-induced metamagnetic transition(antiferromagnetic-ferromagnetic) at/below the Neel temperature of 18 K),the negative entropy changes are observed at corresponding temperature.There is only a second-order ferromagnetic-paramagnetic transition near Curie temperature(TC),the maximum entropy change(Δ_(Smax)) values are-6.14 J·kg^(-1)·K^(-1) at 3 K and 7.88 J·kg^(-1)·K^(-1) at 28 K in a field range of 0-7 T.The reversible relative cooling power corresponding to negative entropy change can reach about 600 J·kg^(-1) in an wide operating temperature region Δ_(Tcycl)=74 K from 16 to90 K,which suggests that Ho_(12)Fe_(2.08)In_(2.92) could be a potential material for magnetic refrigeration in the corresponding temperature range. 展开更多
关键词 re_(3(x+y))(t2)_(x)x_(y)phase Metamagnetic transition Magnetothermal properties Ho-Fe-In alloy
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Er-Fe-In三元系773 K等温截面相图与Er_(12)Fe_(2)In_(3)化合物磁性
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作者 陈湘 倪超 段宇静 《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
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... 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。 展开更多
关键词 Er-Fe-In相图 re_(3×4)(t_(2))_(4-x)x_(x)相 变磁相变 磁热效应
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