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

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• 作者：Lingmin Zeng^a ; ^b ; ^{lmzeng@gxu.edu.cn} ; Wei He^a ; ^b ; Wenjun Shen^a ; ^b ; Meiwen Lu^a ; ^b
• 关键词：Crystal structure ; Rare earth alloys and compounds ; X-ray diffraction ; Thermal expansion
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 July, 2012
• 卷：529
• 期：Complete
• 页码：158-162
• 文件大小：506 K

摘要

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 Ge₁₀Ho₁₁ structure 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 Al₂Er₁₁Ge₈ compound was carried out using high-temperature powder X-ray diffraction technique from 293 K to 743 K, and the calculated lattice and volume thermal expansion coefficients were 伪_a = 0.88 脳 10^鈭? K^鈭?, 伪_c = 1.22 脳 10^鈭? K^鈭?, and 伪_V = 3.01 脳 10^鈭? K^鈭?, respectively.