Abstract
The compounds RbAuUSe3, CsAuUSe3, and RbAuUTe3 were synthesized at 1073 K from the reactions of U, Au, Q, and A2Q3 (A=Rb or Cs; Q=Se or Te). The compound CsAuUTe3 was synthesized at 1173 K from the reaction of U, Au, Te, and CsCl as a flux. These isostructural compounds crystallize in the KCuZrS3 structure type in space group Cmcm of the orthorhombic system. The structure consists of ∞2 [AuU Q3-] layers that contain nearly regular UQ6 octahedra and distorted AuQ4 tetrahedra. The infinite layers are separated by bicapped trigonal prismatic A cations. The magnetic behavior of RbAuUSe3 deviates significantly from Curie-Weiss behavior at low temperatures. For T>200 K, the values of the Curie constant C and the Weiss constant θp are 1.82(9) emu K mol-1 and -3.5(2)×102 K, respectively. The effective magnetic moment μeff is 3.81(9) μB. Formal oxidation states of A/Au/U/Q may be assigned as +1/+1/+4/-2, respectively.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2587-2590 |
| Number of pages | 4 |
| Journal | Journal of Solid State Chemistry |
| Volume | 182 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 2009 |
Funding
This research was supported by the US Department of Energy, Basic Energy Sciences Grant ER-15522. Magnetic measurements were made at the Materials Research Science and Engineering Center, Magnet and Low Temperature Facility, supported by the National Science Foundation (DMR05-20513).
Keywords
- Crystal structure
- Gold
- Magnetism
- Solid-state quaternary chalcogenide
- Synthesis
- Uranium
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry