等结构
结晶学
晶体结构
单斜晶系
八面体
离子半径
空间组
Crystal(编程语言)
材料科学
离子
三角晶系
粉末衍射
化学
X射线晶体学
衍射
物理
有机化学
程序设计语言
光学
计算机科学
作者
Anna V. Ruseikina,S. I. Kol’tsov,Oleg V. Andreev,L. A. Pimneva
出处
期刊:Russian Journal of Inorganic Chemistry
[Springer Nature]
日期:2017-12-01
卷期号:62 (12): 1632-1637
被引量:3
标识
DOI:10.1134/s003602361712018x
摘要
The crystal structures of the first prepared EuLnAgS3 (Ln = Gd and Ho) compounds, which have two polymorphs, were determined by X-ray powder diffraction. α-EuLnAgS3 phases are isostructural to BaErAgS3 (monoclinic crystal system, space group C2/m): a = 17.3168(10) A, b = 3.9683(2) A, c = 8.3174(4) A, β = 103.94° (EuGdCuS3); a = 17.1729(12) A, b = 3.9367(3) A, c = 8.2905(6) A, β = 103.9° (EuHoCuS3). β-EuLnAgS3 phases belong to the AgBiS2 structure type (cubic crystal system, space group Fm-3m): a = 5.739(2) A (EuGdCuS3) and a = 5.678 A (EuHoCuS3). In the α-EuLnAgS3 crystal structure, LnS6 octahedra and AgS5 trigonal bipyramids share edges to form a three-dimensional (3D) structure with channels accommodating Eu2+ ions. A decrease in Ln3+ ionic radius gives rise to the crystal-chemical contraction of the 3D structure.
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