Syntheses and crystal structures of Y7Co6Sn23 and RE5Co6Sn18 (RE = Sc, Ho)
Syntheses and crystal structures of Y7Co6Sn23 and RE5Co6Sn18 (RE = Sc, Ho)
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Y7Co6Sn23 和 RE5Co6Sn18 (RE = Sc, Ho) 的合成和晶体结构
DOI：
10.1016/j.jallcom.2009.06.079
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发表时间：
2009-10
影响因子：
6.2
通讯作者：
Mao, Jiang-Gao
中科院分区：
文献类型：
--
作者：
Hu, Chun-Li;Zhong, Guo-Hua;Lei, Xiao-Wu;Mao, Jiang-Gao
在焊接钽管内高温固相反应制备了y7co6sn23和RE5Co6Sn18（RE=Sc, Ho）单晶。通过单晶x射线衍射研究确定了它们的晶体结构。y7co6sn23为ho7co6sn23型，结晶为三角形空间群P-3m1 (No. 164)，而RE5Co6Sn18（RE=Sc, Ho）为tb5rh6sn18型，结晶为四边形空间群I41/acd （No. 142）。它们的结构都具有基于[CoSn6]三角棱镜的三维（3D）阴离子框架。y7co6sn23的结构是由一种由相同的[CoSn6]三棱柱组成的二维板坯通过共角的方式有序叠加而成，沿c轴形成两种狭窄的隧道，其中分别被Y原子或残余Sn原子占据。re5co6sn18的三维结构是由两种不同的[CoSn6]三角棱柱通过共享角和Sn-Sn键交替堆叠而成。稀土和残余锡原子位于三维框架的间隔层中。带结构计算表明y7co6sn23和sc5co6sn18为金属。
Single crystals of Y7Co6Sn23and RE5Co6Sn18(RE=Sc, Ho) have been obtained by solid-state reactions of the corresponding pure elements in welded tantalum tubes at high temperature. Their crystal structures have been established by single-crystal X-ray diffraction studies. Y7Co6Sn23belongs to the Ho7Co6Sn23type and crystallizes in the trigonal space group P-3m1 (No. 164) whereas RE5Co6Sn18(RE=Sc, Ho) adopt the Tb5Rh6Sn18type structure and crystallizes in the tetragonal space group I41/acd (No. 142). Their structures all feature a three-dimensional (3D) anionic framework based on [CoSn6] trigonal prisms. The structure of Y7Co6Sn23is made from the ordinal stacking one type of 2D slab composed of the same [CoSn6] trigonal prisms via corner-sharing, forming two types of narrow tunnels along the c-axis, which are occupied by Y or residual Sn atoms. The 3D structure of RE5Co6Sn18is built up from alternately stacking two types of 2D slabs, which are composed of different [CoSn6] trigonal prisms via corner-sharing and Sn–Sn bonds, respectively. The RE and residual Sn atoms are located in the spacers of the 3D framework. Band structure calculations indicate that Y7Co6Sn23and Sc5Co6Sn18are metallic.
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影响因子：
8.6
作者：
G. Nolas;T. Weakley;J. Cohn
通讯作者：
G. Nolas;T. Weakley;J. Cohn
DOI：
10.1016/0022-5088(72)90028-8
发表时间：
1972-01-01
期刊：
JOURNAL OF THE LESS-COMMON METALS
影响因子：
--
作者：
HAVINGA, EE;HOKKELING, P;DAMSMA, H
通讯作者：
DAMSMA, H
影响因子：
--
作者：
B. Chevalier;J. Etourneau
通讯作者：
B. Chevalier;J. Etourneau
影响因子：
2.2
作者：
S. Kurth;J. Perdew
通讯作者：
S. Kurth;J. Perdew
影响因子：
6.2
作者：
R. Pöttgen
通讯作者：
R. Pöttgen