Synthesis, structure, and magnetic and electronic properties of Cs2Hg2USe5

被引：11
|
作者：
Bugaris, Daniel E. [1 ]
Wells, Daniel M. [1 ]
Ibers, James A. [1 ]
机构：
[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 05期
关键词：
Uranium mercury chalcogenide; Synthesis; Crystal structure; Magnetism; Electrical conductivity; VALENCE FLUCTUATIONS; CHALCOGENIDES; URANIUM; TERNARY; METAL; SE;
D O I：
10.1016/j.jssc.2009.01.013
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The compound Cs2Hg2USe5 was obtained from the solid-state reaction of U, HgSe, Cs2Se3, Se, and CsI at 1123 K. This material crystallizes in a new structure type in space group P2/n of the monoclinic system with a cell of dimensions a = 10.276(6)angstrom, b = 4.299(2)angstrom, c = 15.432(9) angstrom, beta = 101.857(6)angstrom, and V = 667.2(6)angstrom(3). The structure contain (2)(infinity)[Hg2USe5] layers separated by Cs atoms. Within the layers are distorted HgSe4 tetrahedra and regular USe6 octahedra. In the temperature range of 25-300 K Cs2Hg2USe5 displays Curie-Weiss paramagnetism with mu(eff) = 3.71(2) mu(B). The compound exhibits semiconducting behavior in the [010] direction; the conductivity at 298 K is 3 x 10(-3) S/cm. Formal oxidation states of Cs/Hg/U/Se may be assigned as +1/+2/+4/-2, respectively. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码：1017 / 1020
页数：4
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