Synthesis, crystal structure, resistivity, and electronic structure of the U(V) quaternary polyselenide Ba8PdU2Se12(Se2)2

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

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Abstract A new quaternary uranium(V) selenide, Ba8PdU2Se12(Se2)2, has been synthesized by reaction of elements at 1173 K. A single-crystal X-ray diffraction study shows that the compound crystallizes in a new structure type with two formula units in space group D2h12-Pnnm of the orthorhombic crystal system with cell constants of a=9.490(1), b=12.240(2), and c=13.780(3) Å. Its crystal structure consists of PdU2Se1212- units where U atoms are coordinated to six Se atoms in octahedral geometry and Pd atoms are coordinated to four Se atoms in square-planar geometry. These PdU2Se1212- units are separated by Ba to result in a salt-like crystal structure. This compound also contains Se22- dimers that are part of Ba coordination polyhedra. The formula charge balances as (Ba2+)8(Pd2+)(U5+)2(Se2-)12(Se22-)2. Theoretical calculations predict antiferromagnetic semiconducting behavior for this compound with a band gap of 1.6 eV. Temperature-dependent four-probe resistivity measurements on single crystal confirm the semiconducting nature with an activation energy of 0.18(1) eV.

Original languageEnglish (US)
Article number18961
Pages (from-to)70-74
Number of pages5
JournalJournal of Solid State Chemistry
Volume230
DOIs
StatePublished - Jul 8 2015

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Keywords

  • Crystal structure
  • Resistivity studies
  • Synthesis
  • Uranium(V) selenide

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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