Crystal structure, thermal expansion and magnetic properties of Nd2Cu0.8Ge3 compound

Crystal structure, thermal expansion and magnetic properties of Nd2Cu0.8Ge3 compound
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Nd2Cu0.8Ge3化合物的晶体结构、热膨胀及磁性能

DOI:
10.1016/j.jpcs.2012.04.015
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发表时间:
2011-11
影响因子:
4
通讯作者:
Shih, Kaimin
Shih, Kaimin
中科院分区:
材料科学3区
文献类型:
--
作者:
Lu, Xingwen;Zeng, Lingmin;Shih, Kaimin

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合成了一种新的三元金属间化合物Nd_2Cu_(0.8)Ge_3,用Rietveld方法对X射线粉末衍射数据进行了修正,确定了其晶体结构。Nd_2Cu_(0.8)Ge_3化合物属于空间群I41/amd(No.141),结构类型为四方a-ThSi_2,a=0.41783(2)nm,c=1.43689(9)nm,Z=2,Dcalc=7.466g/cm ~ 3。利用高温粉末X射线衍射(HTXRD)技术研究了化合物在298- 648 K温度范围内的晶格热膨胀行为,结果表明,其晶胞参数随温度的升高呈各向异性增加。在5- 300 K温度范围内测量的磁化率表明,低温下Nd2Cu0.8Ge3为反铁磁有序,在50- 300 K温度范围内磁化率可以用居里-外斯定律很好地描述。计算得到的有效磁矩μeff为3.53μBand,主要是Nd ~(3+)离子的贡献。
A new ternary intermetallic compound, Nd2Cu0.8Ge3, was synthesized and its crystal structure was determined by Rietveld refinement of X-ray powder diffraction data. The Nd2Cu0.8Ge3compound crystallizes in space group I41/amd (No. 141), with a tetragonal a-ThSi2structure type, and a=0.41783(2)nm, c=1.43689(9)nm, Z=2 and Dcalc=7.466g/cm3. Using the high temperature powder X-ray diffraction (HTXRD) technique, the lattice thermal expansion behavior of the compound was investigated in the temperature range of 298–648K, and the result shows that its unit-cell parameters increased anisotropically when temperature increased. The magnetic susceptibility measured in the temperature range of 5–300K indicated antiferromagnetic order of Nd2Cu0.8Ge3at low temperatures, and the magnetic susceptibility can be well described over the range of 50–300K using Curie–Weiss law. The calculated effective magnetic moment (μeff) is 3.53μBand dominated by the contribution of the Nd3+ions.
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