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中国物理学会期刊

NdNi2Ge2化合物的结构和电磁输运性质

CSTR: 32037.14.aps.60.107306

Structure and electromagnetic transport properties of compound NdNi2Ge2

CSTR: 32037.14.aps.60.107306
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  • 利用非自耗真空电弧熔炼法制备了NdNi2Ge2化合物样品,采用X射线粉末衍射技术和Rietveld全谱拟合分析方法测定了其晶体结构. 结果显示该化合物的空间群为I4/mmm,点阵参数为:a=4.120(1),c=9.835(0),Z=2,Nd原子占据2a晶位,Ni原子占据4d晶位,Ge原子占据4e晶位. NdNi2Ge2化合物呈现顺磁性,应用居里-外斯定律拟合计算得到居里-外斯常数为25.8,居里-外斯温度为6.24 K. 有效势磁矩为3.69B,这与理论计算Nd3+的磁矩相符,表明磁矩主要源于Nd3+. 电阻率变化范围为0.3 m-11 m,电阻曲线拟合显示NdNi2Ge2呈半金属性.

     

    The sample of compound NdNi2Ge2 is prepared by arc melting. The crystal structure is analyzed using powder X-ray diffraction and refined with Rietveld is method. It is shown that NdNi2Ge2 intermetallic compound crystallizes into a tetragonal structure with space group of I/4mmm and its lattice constant is a=4.120(1),c=9.835(0), Z=2. Nd atoms occupy 2a positions, Ni atoms 4d positions and Ge atom 4e positions. NdNi2Ge2 intermetallic compound has a Curie-Weiss constant of 25.8 and Curie-Weiss temperature of 6.24 K. The effective magnetic moment is 3.69B, which is very close to that of Nd3+. It implies that the magnetic moment originates mainly from Nd3+ ion. The resistivity varies from 0.3 m1.1 m. Fitting results show that this intermetallic compound is semimetal.

     

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