TmNiIn化合物的磁性和磁致热效应  

Magnetic Property and Magnetocaloric Effect of TmNiIn Compounds

作　　者：韩升 郝志红[2] 霍滢 陈兴 邓子良 赵云 莫兆军 HAN Sheng;HAO Zhihong;HUO Ying;CHEN Xing;DENG Ziliang;ZHAO Yun;MO Zhaojun(School of Material Science and Engineering,Tianjin University of Technology,National Demonstration Center for Experimental Function Materials Education,Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education of Ministry of Education,Key Laboratory for Optoelectronic Materials and Devices of Tianjin,Tianjin University of Technology,Tianjin 300384,China;School of Optometry,Tianjin Vocational Institute,Tianjin 300410,China)

机构地区：[1]天津理工大学材料科学与工程学院,功能材料国家级实验教学示范中心,显示材料与光电器件教育部重点实验室,天津市光电显示材料与器件重点实验室,天津300384 [2]天津职业大学眼视光学院,天津300410

出　　处：《材料科学与工程学报》2019年第6期1008-1012,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(11504266);天津市自然科学基金资助项目(17JCQNJC02300,17JCQNJC03100)

摘　　要：利用电弧熔炼技术得到TmNiIn稀土金属间化合物,研究其磁性和磁热效应。研究表明TmNiIn金属间化合物的晶体结构是ZrNiAl型的六方密堆积结构,是一种具有可逆磁热效应的材料。TmNiIn是反铁磁材料,其相变温度为3.5K,在液氦温度(4.2K)附近。根据等温磁化曲线并利用麦克斯韦关系式计算可以得到磁熵变与温度的关系。当磁场变化为5T时,最大磁熵变和制冷能力分别为12.1J/kg·K和138J/kg。当磁场变化为2T时,最大磁熵变5.3J/kg·K,同时在TmNiIn金属间化合物中未观察到热滞现象和磁滞损耗。大的可逆磁致热效应表明TmNiIn是一种在低温磁制冷技术中有应用前景的材料。TmNiIn rare earth intermetallic compound was obtained by arc melting technique,and their magnetic and magnetocaloric effect were investigated.The crystal structure of the TmNiIn is ZrNiAl type of hexagonal packing structure,and a reversible magnetocaloric effect has been observed.TmNiIn is an antiferromagnetic material and its phase transition temperature is 3.5 K,nearing the temperature of liquid helium(4.2 K).According to the isothermal magnetization curve and maxwell relation calculation,the relationship between magnetic entropy change and temperature can be obtained.For the magnetic field change of 5 T,the maximum value of magnetic entropy change(-ΔSMmax)and the value of refrigerant capacity(RC)are evaluated to be 12.1 J/kg·K and 138 J/kg,respectively.The value of-ΔSMmax(5.3 J/kg·K)is achieved at 3.5 K under a low magnetic field change from 0 to 2 T with no thermal hysteresis and magnetic hysteresis loss.The large reversible magnetocaloric effect(both the large-ΔSM and the high RC)indicates that TmNiIn is one of promising materials for magnetic refrigeration at low temperature.

关 键 词：磁热效应 磁熵变 磁相转变 

分 类 号：O469[理学—凝聚态物理]