Crystal Structure and Physical Properties of β USe2and USe2−xTex(x= 0.24 and 0.72)

✍ Scribed by H. Noël; M. Potel; R. Troc; L. Shlyk

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 271 KB
• Volume: 126
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1996.0304

✦ Synopsis

known, but single crystals of Ͳ USe2 have been obtained, and the structure of this compound has been determined

The uranium diselenide ␤ USe 2 and the seleno-telluride USe 1.76 Te 0.24 crystallize in the orthorhombic system, with the recently (9). PbCl 2 type, space group Pnma, and lattice constants a ‫؍‬ The crystal structure of ͱ US 2 was first refined by Suski 7.455(2), b ‫؍‬ 4.2320(5), c ‫؍‬ 8.964(2) A ˚for ␤ USe 2 and a ‫؍‬ et al. (6) by using single crystal data, which confirmed the 7.542(1), b ‫؍‬ 4.2491(4), c ‫؍‬ 9.006(2) A ˚for USe 1.76 Te 0.24 . Their structure as a PbCl 2 -type, described in the space group crystal structures were refined from single cystal X-ray diffrac-Pbnm. The coordinates of the atoms and morphological tion data, with conventional R factors 0.064 and 0.046, respecfeatures of the growth of single crystals for both ͱ US 2 tively. Both compounds exhibit ferromagnetism with Curie and ͱ USe 2 have been studied by Ellert et al. (7). They were temperatures of 14 K for the former and 33 K for the latter. able to determine the predominant faces of the crystals,

The structural, electrical, and magnetic properties of these chalsymmetry classes, and the point groups. However, the calcogenides as well as of ␤ US 2 , UTe 2 and other mixed chalcogenculation of the positional parameters, which were carried ides are discussed.