title: Synthesis and characterization of two quaternary uranium tellurides, RbTiU₃Te₉ and CsTiU₃Te₉.
abstract: Black crystals of RbTiU₃Te₉ and CsTiU₃Te₉ 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 C(2h)²-P2₁/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 UTe₂ 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 CsTiU₃Te₉ 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) μ(B) is believed to arise from a coexistence of magnetic and nonmagnetic U atoms.
authors: Department of Chemistry, Northwestern University , Evanston, Illinois 60208-3113, United States.
authors: Matthew D
authors: MD
authors: Ward
authors: Adel
authors: A
authors: Mesbah
authors: Minseong
authors: M
authors: Lee
authors: Christos D
authors: CD
authors: Malliakas
authors: Eun Sang
authors: ES
authors: Choi
authors: James A
authors: JA
authors: Ibers