Three new quaternary actinide chalcogenides Ba2TiUTe7, Ba2CrUTe7, and Ba2CrThTe7: Syntheses, crystal structures, transport properties, and theoretical studies

Jai Prakash, Adel Mesbah, Jessica Beard, Sébastien Lebègue, Christos D Malliakas, James A Ibers*

*Corresponding author for this work

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Abstract

The three new quaternary actinide chalcogenides Ba2TiUTe7, Ba2CrUTe7, and Ba2CrThTe7 have been synthesized. From single-crystal X-ray diffraction studies these isostructural compounds are found to crystallize in a new structure type in space group D2h16-Pnma of the orthorhombic system. The structure features ∞1[MAnTe74-] strips (M = Cr or Ti; An = Th or U) that propagate in the b-direction and are separated by Ba cations. An atoms are coordinated to eight Te atoms in a bicapped trigonal-prismatic geometry while M atoms are octahedrally coordinated to six Te atoms. Sharing of the AnTe8 and MTe6 polyhedra forms 1[MAnTe74-] strips. The presence of the infinite linear Te-Te-Te chains in these compounds makes assignment of oxidation states arbitrary. Resistivity measurements and DFT calculations provide further insight into the properties of these compounds.

Original languageEnglish (US)
Pages (from-to)3688-3694
Number of pages7
JournalInorganic chemistry
Volume54
Issue number7
DOIs
Publication statusPublished - Apr 6 2015

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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