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ChemInform Abstract: New Uranium Chalcoantimonates, RbU2SbS8 and KU2SbSe8, with a Polar Noncentrosymmetric Structure.

✍ Scribed by Kyoung-Shin Choi; Mercouri G. Kanatzidis

Publisher
John Wiley and Sons
Year
2010
Weight
29 KB
Volume
30
Category
Article
ISSN
0931-7597

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✦ Synopsis

structure (solids and liquids) D 2000

49 -005

New Uranium Chalcoantimonates, RbU 2 SbS 8 and KU 2 SbSe 8 , with a Polar Noncentrosymmetric Structure.

-Single crystals of the new title compounds are obtained by the polychalcogenide molten flux method. RbU 2 SbS 8 crystallizes in the monoclinic space group Cm with Z = 2. The compound has a two-dimensional character with layers running perpendicular to the c-axis. The coordination geometry around U 4+ is best described as a bicapped trigonal prism. KU 2 SbSe 8 crystallizes in space group Cm with Z = 4 and has essentially the same structure as RbU 2 SbS 8 . The latter is a semiconductor with a band gap of 1.38 eV.

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