New Ternary Uranium Copper Chalcogenides Cu2U3S7and Cu2U3Se7: Crystal Structure and Magnetic Properties
作者:A. Daoudi、M. Lamire、J.C. Levet、H. Noël
DOI:10.1006/jssc.1996.0188
日期:1996.5
The new compounds Cu2U3S7and Cu2U3Se7have been synthesized by direct reaction between UX2(X= S,Se), Cu, and chalcogens at 600°C. Single crystals were obtained using the chemical vapor transport method. The compounds crystallize in the hexagonal system witha= 9.7308(8),c= 5.7045(6) Å for Cu2U3S7anda= 10.138(1),c= 5.9525(7) Å for Cu2U3Se7. The crystal structures of the two compounds were solved in the
新型化合物Cu 2 U 3 S 7和Cu 2 U 3 Se 7是通过U X 2(X = S,Se),Cu和硫族元素在600°C之间直接反应合成的。使用化学气相传输方法获得单晶。化合物结晶与六方晶系一= 9.7308(8),C ^ = 5.7045(6)一种对Cu 2 Ü 3 š 7和一个= 10.138(1),C ^ = 5.9525(7)一种铜2 ù 3硒7。这两种化合物的晶体结构中的空间群就解决了P 6 3和细化到可靠性因子的最终值[R = 0.031,[R ω = 0.038对Cu 2 Ü 3小号7和- [R = 0.036,[R ω = 0.044用于Cu 2 U 3 Se 7。它们与La 3 CuSiS 7是同型的。磁测量表明,Cu 2 U 3 S 7的顺磁行为低至5 K,而Cu 2 U 3Se 7在T N = 13 K时表现出反铁磁跃迁。