RbAuUSe{sub 3}, CsAuUSe{sub 3}, RbAuUTe{sub 3}, and CsAuUTe{sub 3}: Syntheses and structure; magnetic properties of RbAuUSe{sub 3}

Journal Article · Tue Sep 15 04:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.07.012· OSTI ID:21370595

Bugaris, Daniel E ^[1]

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1. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113 (United States)

The compounds RbAuUSe{sub 3}, CsAuUSe{sub 3}, and RbAuUTe{sub 3} were synthesized at 1073 K from the reactions of U, Au, Q, and A{sub 2}Q{sub 3} (A=Rb or Cs; Q=Se or Te). The compound CsAuUTe{sub 3} was synthesized at 1173 K from the reaction of U, Au, Te, and CsCl as a flux. These isostructural compounds crystallize in the KCuZrS{sub 3} structure type in space group Cmcm of the orthorhombic system. The structure consists of {sub i}nfinity{sup 2}[AuUQ{sub 3}{sup -}] layers that contain nearly regular UQ{sub 6} octahedra and distorted AuQ{sub 4} tetrahedra. The infinite layers are separated by bicapped trigonal prismatic A cations. The magnetic behavior of RbAuUSe{sub 3} deviates significantly from Curie-Weiss behavior at low temperatures. For T>200 K, the values of the Curie constant C and the Weiss constant theta{sub p} are 1.82(9) emu K mol{sup -1} and -3.5(2)x10{sup 2} K, respectively. The effective magnetic moment mu{sub eff} is 3.81(9) mu{sub B}. Formal oxidation states of A/Au/U/Q may be assigned as +1/+1/+4/-2, respectively. - Graphical abstract: View down [100] of the crystal structure of the isostructural AAuUQ3 (A=Rb, Cs; Q=Se, Te) compounds.

• OSTI ID: 21370595
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 9 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
CESIUM CHLORIDES
CESIUM COMPOUNDS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
GOLD COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
ORTHORHOMBIC LATTICES
PHYSICAL PROPERTIES
RUBIDIUM COMPOUNDS
SELENIDES
SELENIUM COMPOUNDS
SPACE GROUPS
SYMMETRY GROUPS
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT COMPOUNDS
URANIUM COMPOUNDS