Synthesis and characterization of two quaternary uranium tellurides, RbTiU3Te9 and CsTiU3Te9

Matthew D. Ward, Adel Mesbah, Minseong Lee, Christos D Malliakas, Eun Sang Choi, James A Ibers*

*Corresponding author for this work

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Abstract

Black crystals of RbTiU3Te9 and CsTiU 3Te9 have been synthesized at 1223 and 1173 K, respectively, by high-temperature solid-state routes. These compounds crystallize in a new structure type in space group C2h2-P2 1/m of the monoclinic system. The structure, which is similar to that of CsTiUTe5, consists of UTe2 layers connected into a three-dimensional framework by TiTe6 octahedra. The expanded UTe 2 layers leave channels that are filled by Rb or Cs atoms. Single-crystal resistivity measurements on CsTiU3Te9 are consistent with semiconducting behavior; the calculated activation energy is 0.30(1) eV. X-ray photoelectron spectroscopic measurements on CsTiU 3Te9 indicate that the compound contains U4+. From single-crystal magnetic measurements, CsTiU3Te9 is consistent with antiferromagnetic coupling between magnetic U atoms. The very low value of the effective magnetic moment of 0.56(2) μB is believed to arise from a coexistence of magnetic and nonmagnetic U atoms.

Original languageEnglish (US)
Pages (from-to)7909-7915
Number of pages7
JournalInorganic Chemistry
Volume53
Issue number15
DOIs
Publication statusPublished - Aug 4 2014

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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