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LaFe_11.2Co_0.7Si_1.1B_x合金在室温区的大磁热效应

Large Magnetocaloric Effects of LaFe_11.2Co_0.7Si_1.1B_x Alloys at Room Temperature

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【Author】 GONG Ji-cheng1,HUANG Jiao-hong2,GUO Feng1,SONG Lin3,JIN Pei-yu2,YAN Hong-wei2(1.School of Materials Science and Engineering,Inner Mongolia University of Technology,Huhhot 010051,China;2.Baotou Research Institute of Rare Earths,Baotou 014030,China;3.Key Laboratory of Magnetic Materials,Inner Mongolia Normal University,Huhhot 010022,China)

【机构】内蒙古工业大学材料科学与工程学院；包头稀土研究院；内蒙古师范大学磁性材料重点实验室；包头稀土研究院内蒙古呼和浩特010051；内蒙古包头014030；内蒙古呼和浩特010051；内蒙古呼和浩特010022；

【摘要】从室温磁制冷目的出发,用工业纯原料制备了具有NaZn13型结构的稀土铁基化合物LaFe11.2Co0.7Si1.1Bx(x=0,0.1,0.2,0.25,0.3,0.4,0.5),并对其磁热效应进行了研究。实验结果表明,LaFe11.2Co0.7Si1.1Bx合金在室温区具有大磁热效应,在x=0.2时,磁熵变ΔSm的峰值位于居里温度TC=270K处,1.5T外磁场下达到7.3J/kg.K,直接测量绝热温变ΔTad达到2.7K;B元素作为置换原子和间隙原子进入NaZn13相,显著提高了合金的磁熵变和居里温度。更多还原

【Abstract】 The magnetocaloric effects of La-Fe based NaZn13-type compounds LaFe11.2Co0.7Si1.1Bx(x=0,0.1,0.2,0.25,0.3,0.4,0.5) prepared with commercial pure raw materials have been investigated.Experimental results show that the alloys have large magnetocaloric effects at room temperature,the maximum of magnetic entropy changes and directly measured adiabatic temperature changes are 7.3J/kg·K and 2.7K in a magnetic field of 1.5T at TC=270K;B element enters into the NaZn13-type structure phase by substituting B for Si and doping B into interstitial position of the lattice,as well as increases the magnetic entropy changes and curie temperatures of the alloys slightly.更多还原