Redetermination of the crystal structure of R5Si4 (R = Pr, Nd) from single-crystal X-ray diffraction data

Redetermination of the crystal structure of R5Si4 (R = Pr, Nd) from single-crystal X-ray diffraction data
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从单晶 X 射线衍射数据重新测定 R5Si4 (R = Pr, Nd) 的晶体结构

DOI:
10.1107/s2056989020002789
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发表时间:
2020
期刊:
Acta Crystallographica Section E, CRYSTALLOGRAPHIC COMMUNICATIONS
影响因子:
--
通讯作者:
Y. Uwatoko and I. Umehara
Y. Uwatoko and I. Umehara
中科院分区:
--
文献类型:
--
作者:
K. Yokota;R. Watanuki;M. Nakashima;M. Uehara;J. Gouchi;Y. Uwatoko and I. Umehara

文献摘要

相似文献

使用高质量的单晶X射线衍射数据重新确定了硅化镨(5/4)、Pr 5Si 4和硅化钕(5/4)、Nd 5Si 4的晶体结构。Pr 5Si 4的先前结构报告仅基于粉末X射线衍射数据[Smith等人(1967)。Acta Cryst.22 940-943; Yang等人(2002 b)。J.合金公司339,189-194; Yang等人,(2003年)的报告。J.合金公司263,146-153]。另一方面,Nd 5Si 4的结构已经由粉末数据确定[neutron; Cadogan等人,(2002年)的报告。J.物理.康登斯Matter,14,7191-7200]和X射线[Smith等人(1967). Acta Cryst.22 940-943; Yang等人(2002 b)。J.合金公司339,189-194; Yang等人,(2003年)的报告。J.合金公司263,146-153]和具有各向同性原子位移参数的单晶数据[Roger等人,(2006年)。J.合金公司415,73-84]。此外,各向异性原子位移参数的所有原子网站已被确定为第一次。这些化合物被证实具有四方Zr 5Si 4型结构(空间群:P41212),如先前报道的(Smith等人,1967年)。该结构由Pr(Nd)原子组成的扭曲体心立方体构成,这些体心立方体通过边缘共享相互连接以形成三维框架。该框架界定了硅二聚体位于其中的Z字形通道。
The crystal structures of praseodymium silicide (5/4), Pr5Si4, and neodymium silicide (5/4), Nd5Si4, were redetermined using high-quality single-crystal X-ray diffraction data. The previous structure reports of Pr5Si4 were only based on powder X-ray diffraction data [Smith et al. (1967). Acta Cryst. 22 940–943; Yang et al. (2002b). J. Alloys Compd. 339, 189–194; Yang et al., (2003). J. Alloys Compd. 263, 146–153]. On the other hand, the structure of Nd5Si4 has been determined from powder data [neutron; Cadogan et al., (2002). J. Phys. Condens. Matter, 14, 7191–7200] and X-ray [Smith et al. (1967). Acta Cryst. 22 940–943; Yang et al. (2002b). J. Alloys Compd. 339, 189–194; Yang et al., (2003). J. Alloys Compd. 263, 146–153] and single-crystal data with isotropic atomic displacement parameters [Roger et al., (2006). J. Alloys Compd. 415, 73–84]. In addition, the anisotropic atomic displacement parameters for all atomic sites have been determined for the first time. These compounds are confirmed to have the tetragonal Zr5Si4-type structure (space group: P41212), as reported previously (Smith et al., 1967). The structure is built up by distorted body-centered cubes consisting of Pr(Nd) atoms, which are linked to each other by edge-sharing to form a three-dimensional framework. This framework delimits zigzag channels in which the silicon dimers are situated.