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通过X射线衍射和磁性测量研究了Tb(Co1-xSnx)2(x=0,0.025,0.050,0.075,0.100)合金的相结构和磁热性能。经分析可知Sn在TbCo2中的替代是有限的,X粉末衍射分析确定TbCo2具有MgCu2结构,其他样品由TbCo2,TbCo3和Tb5Sn3三相组成,TbCo2为主要相。随着Sn成分的增加,杂质相TbCo3和Tb5Sn3的含量增加,所有样品保持第二序磁相变。Sn的替代使磁相变的温度稍微有所提高,样品TbCo2的TC值为230 K,样品Tb(Co0.950Sn0.050)2的TC值为233 K,但Sn的成分继续增加,样品的TC值有所下降。在外加磁场2 T的作用下,样品Tb(Co1-xSnx)2(x=0,0.025,0.050,0.075)最大磁熵变值分别为3.44,2.29,1.64,1.16 J.kg-1.K-1。
The phase structure and magnetocaloric properties of Tb (Co1-xSnx) 2 (x = 0,0.025,0.050,0.075,0.100) alloys were investigated by X-ray diffraction and magnetic measurements. The analysis shows that the substitution of Sn in TbCo2 is limited. X-ray diffraction analysis shows that TbCo2 has the structure of MgCu2. The other samples consist of TbCo2, TbCo3 and Tb5Sn3 three phases and TbCo2 as the main phase. With the increase of Sn composition, the contents of TbCo3 and Tb5Sn3 in the impurity phase increase, and all the samples maintain the second order magnetic phase transition. The temperature of magnetic phase change is slightly improved by the substitution of Sn. The TC value of TbCo2 sample is 230 K, the TC value of Tb (Co0.950Sn0.050) 2 sample is 233 K, but the composition of Sn continues to increase. The TC The value has dropped. Under the applied magnetic field of 2 T, the maximum magnetic entropy change values of Tb (Co1-xSnx) 2 (x = 0,0.025,0.050,0.075) were 3.44,2.29,1.64,1.16Jkg-1.K- 1.