Crystal structure of new ternary compounds Al2R11Ge8 (R = Y, Gd, Tb, Dy, Ho, Er) and thermal properties of Al2Er11Ge8

Crystal structure of new ternary compounds Al2R11Ge8 (R = Y, Gd, Tb, Dy, Ho, Er) and thermal properties of Al2Er11Ge8
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新型三元化合物Al2R11Ge8(R=Y、Gd、Tb、Dy、Ho、Er)的晶体结构及Al2Er11Ge8的热性能

DOI:
10.1016/j.jallcom.2012.02.171
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发表时间:
2012-07
影响因子:
6.2
通讯作者:
Lu, Meiwen
Lu, Meiwen
中科院分区:
材料科学2区
文献类型:
--
作者:
Zeng, Lingmin;He, Wei;Shen, Wenjun;Lu, Meiwen

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用X射线粉末衍射Rietveld方法研究了新三元化合物Al_2 R_(11)Ge_8(R=Y,Gd,Tb,Dy,Ho,Er)的晶体结构。扫描电子显微镜(SEM)结合能量色散X射线光谱(EDS)用于样品成分检查。化合物均为Ge_(10)Ho_(11)结构,空间群为I_4/mmm。在R=La,Ce,Pr和Nd的体系中没有发现该相。利用高温粉末X射线衍射技术研究了Al 2 Er 11 Ge 8化合物在293 ~ 743 K的晶格热膨胀系数,计算出的晶格和体积热膨胀系数分别为αa=0.88×10− 5 K −1,αc=1.22×10− 5 K −1,αV=3.01×10− 5 K −1。
The crystal structure of new ternary compounds Al2R11Ge8(R=Y, Gd, Tb, Dy, Ho, Er) was studied using X-ray powder diffraction data by Rietveld method. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) was used for sample composition examination. The compounds crystallized in the Ge10Ho11structure type (space group I4/mmm). The phase was not found in the systems with R=La, Ce, Pr and Nd. The lattice thermal expansion study of the Al2Er11Ge8compound was carried out using high-temperature powder X-ray diffraction technique from 293K to 743K, and the calculated lattice and volume thermal expansion coefficients were αa=0.88×10−5K−1, αc=1.22×10−5K−1, and αV=3.01×10−5K−1, respectively.
DOI: 10.1016/j.matchemphys.2008.07.008
发表时间: 2008-12
影响因子: 4.6
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