Synthesis and characterization of the new uranium yttrium oxysulfide UY4O3S5

Geng Bang Jin, Eun Sang Choi, Daniel M. Wells, James A. Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Red needles of UY4O3S5 have been synthesized by the solid-state reaction at 1273 K of UOS and Y2S3 with Sb2S3 as a flux. UY4O3S5 adopts a three-dimensional structure that contains five crystallographically unique heavy-atom positions. U and Y atoms disorder on one eight-coordinate metal position bonded to four O atoms and four S atoms and two seven-coordinate metal positions bonded to three O atoms and four S atoms. Another eight-coordinate metal position with two O and six S atoms and one six-coordinate metal position with six S atoms are exclusively occupied by Y atoms. UY4O3S5 is a modified Curie-Weiss paramagnet between 1.8 and 300 K. Its effective magnetic moment is estimated to be 3.3(2) μB. UY4O3S5 has a band gap of 1.95 eV. The electrical resistivity along the [010] direction of a single crystal shows Arrhenius-type thermal activation with an activation energy of 0.2 eV.

Original languageEnglish (US)
Pages (from-to)1861-1866
Number of pages6
JournalJournal of Solid State Chemistry
Volume182
Issue number7
DOIs
StatePublished - Jul 1 2009

Keywords

  • Activation energy
  • Band gap
  • Paramagnetic
  • Uranium yttrium oxysulfide
  • X-ray crystal structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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