(1. 內(nèi)江師范學(xué)院，物理與電子信息工程學(xué)院，內(nèi)江 641112；
2. The Ames Laboratory, Department of Energy of the Unite States, Iowa State University, Ames, Iowa 50011-3020, USA)
摘 要: 本文以X射線粉末衍射譜、等溫磁化曲線和等磁場變溫曲線為基礎(chǔ)，研究了Er-Fe-In三元系773 K等溫截面相圖與Er12Fe2In3化合物的磁性。結(jié)果表明：該三元系中只有一個三元化合物Er12Fe2In3存在，且二元化合物與三元化合物均未觀察到固溶現(xiàn)象。化合物的磁性研究表明，低場下Er12Fe2In3合金分別在10 K出現(xiàn)了一個正常反鐵磁-順磁相變以及在36 K出現(xiàn)一個類似反鐵磁-順磁的磁相變。磁化過程中存在磁場誘導(dǎo)反鐵磁-鐵磁相變，在2 T以上磁場中該合金只在居里溫度約12 K時存在鐵磁-順磁相變。在0~5 T磁場范圍內(nèi)，合金的最大等溫磁熵變(-ΔSMax)為9.9 J/(kg·K)，在等溫磁熵變最大值半高寬ΔTcycl=38.0 K(5.7~43.7 K)范圍內(nèi)，其相對制冷能力為278.1 J/kg。
關(guān)鍵字: Er-Fe-In相圖；RE3×4(T2)4-xXx相；變磁相變；磁熱效應(yīng)
（1. College of Physics and Electronic Information Engineering, Neijiang Normal University, Neijiang 641100, China;
2. The Ames Laboratory, Department of Energy of the Unite States, Iowa State University, Ames, Iowa 50011-2416, USA）
Abstract: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, Er12Fe2In3 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 Er12Fe2In3 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 Néel, 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 region ΔTcycl=38 K, from 5.7 K to 43.7 K.
Key words: Er-Fe-In ternary phase diagram; RE3(x+y)(T2)xXy phase; metamagnetic transition; magnetothermal properties
