Co掺杂对Mn_(50)Ni_(40)Sn_(10)合金的相变和磁热效应的影响
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摘要
采用电弧熔炼的方法制备了Mn_(50-x)Co_xNi_(40)Sn_(10)(x=0,2,4,6)材料的合金铸锭.用X射线衍射表征样品的晶体结构,用MPMS-3磁性测量系统测量样品的相变和磁热效应.结果表明,Co替代Mn导致马氏体转变温度升高,这是由于Co原子的价电子数多于Mn原子导致的.所有样品在马氏体转变伴随着较大的磁化强度的突变,从而表现出较大的低场磁熵变.Mn_(50-x)Co_xNi_(40)Sn_(10)(x=0,2,4,6)以其较大的低场磁热效应、可调的工作温区在磁制冷领域有着潜在的应用.
The alloy ingots of Mn_(50-x)Co_xNi_(40)Sn_(10)(x=0, 2, 4, 6) were prepared by arc melting, and their crystal structure, phase transitions, and magnetocaloric effect were characterized by X-ray diffraction and MPMS-3 magnetic measurement system. The results show that the substitution of Co for Mn leads to the increase of martensite transformation temperature, which is due to the fact that the number of valence electrons in Co atom is more than that of Mn atom. The martensitic transformation of all samples is accompanied by a sudden change in magnetization, which results in large low-field magnetic entropy changes. Mn_(50-x)Co_xNi_(40)Sn_(10)(x=0,2,4,6) alloys have potential applications in the field of magnetic refrigeration thanks to the large low-field magnetocaloric effect and adjustable working temperature range.
The alloy ingots of Mn_(50-x)Co_xNi_(40)Sn_(10)(x=0, 2, 4, 6) were prepared by arc melting, and their crystal structure, phase transitions, and magnetocaloric effect were characterized by X-ray diffraction and MPMS-3 magnetic measurement system. The results show that the substitution of Co for Mn leads to the increase of martensite transformation temperature, which is due to the fact that the number of valence electrons in Co atom is more than that of Mn atom. The martensitic transformation of all samples is accompanied by a sudden change in magnetization, which results in large low-field magnetic entropy changes. Mn_(50-x)Co_xNi_(40)Sn_(10)(x=0,2,4,6) alloys have potential applications in the field of magnetic refrigeration thanks to the large low-field magnetocaloric effect and adjustable working temperature range.
引文
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[3]L'VOV V A,KOSOGOR A,BARANDIARAN J M,et al.Theoretical description of magnetocaloric effect in the shape memory alloy exhibiting metamagnetic behavior[J].Journal of Applied Physics,2016,119(1):013902.
[4]CASTILLO-VILLA P O,MANOSA L,PLANES A,et al.Elastocaloric and magnetocaloric effects in Ni-Mn-Sn(Cu)shape-memory alloy[J].Journal of Applied Physics,2013,113(5):053506.
[5]COMTESSE D,GRUNER M E,OGURA M,et al.First-principles calculation of the instability leading to giant inverse magnetocaloric effects[J].Physical Review B,2014,89(18):184403.
[6]ENTEL P,SOKOLOVSKIY V V,BUCHELNIKOV V D,et al.The metamagnetic behavior and giant inverse magnetocaloric effect in Ni-Co-Mn-(Ga,In,Sn)Heusler alloys[J].Journal of Magnetism and Magnetic Materials,2015,385:193-197.
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