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

doi:10.1021/ic500599d

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

Chemistry

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13 Scopus citations

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) μ_B is believed to arise from a coexistence of magnetic and nonmagnetic U atoms.

Original language	English (US)
Pages (from-to)	7909-7915
Number of pages	7
Journal	Inorganic chemistry
Volume	53
Issue number	15
DOIs	https://doi.org/10.1021/ic500599d
State	Published - Aug 4 2014

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "Synthesis and characterization of two quaternary uranium tellurides, RbTiU3Te9 and CsTiU3Te9",

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.",

author = "Ward, {Matthew D.} and Adel Mesbah and Minseong Lee and Malliakas, {Christos D.} and Choi, {Eun Sang} and Ibers, {James A.}",

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T1 - Synthesis and characterization of two quaternary uranium tellurides, RbTiU3Te9 and CsTiU3Te9

AU - Ward, Matthew D.

AU - Mesbah, Adel

AU - Lee, Minseong

AU - Malliakas, Christos D.

AU - Choi, Eun Sang

AU - Ibers, James A.

PY - 2014/8/4

Y1 - 2014/8/4

N2 - 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.

AB - 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.

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

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