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Related Experiment Video

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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

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Ba8Hg3U3S18: a complex uranium(+4)/uranium(+5) sulfide.

Daniel E Bugaris¹, James A Ibers

¹Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.

Inorganic Chemistry

|December 20, 2011

Summary

A new hexagonal material, Ba(8)Hg(3)U(3)S(18), was synthesized and characterized. This compound exhibits complex uranium oxidation states and an antiferromagnetic transition at 59 K.

Area of Science:

Solid-state chemistry
Inorganic materials science
Crystallography

Background:

The synthesis of novel uranium-containing compounds is crucial for understanding their unique properties.
Investigating materials with mixed oxidation states can reveal complex electronic and magnetic behaviors.

Purpose of the Study:

To synthesize and characterize a new compound, Ba(8)Hg(3)U(3)S(18).
To determine its crystal structure, magnetic properties, and the formal oxidation states of uranium.

Main Methods:

Solid-state reaction at 1123 K using uranium, mercury sulfide, barium sulfide, and sulfur.
Flux method employing BaBr(2)/KBr or BaCl(2).
X-ray diffraction for crystal structure determination.
Magnetic susceptibility measurements from 100-300 K and below the Néel temperature.

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Main Results:

Ba(8)Hg(3)U(3)S(18) crystallizes in a new hexagonal structure type (space group P6).
The structure features infinite chains of US(6) octahedra and dithiomercurate anions, separated by Ba(2+) cations.
Magnetic susceptibility follows the Curie-Weiss law, indicating paramagnetic behavior, with an effective magnetic moment.
An antiferromagnetic transition was observed at T(N) = 59 K.
Evidence suggests the presence of uranium in mixed formal oxidation states of +4 and +5.

Conclusions:

The novel compound Ba(8)Hg(3)U(3)S(18) has been successfully synthesized and structurally characterized.
The magnetic data and structural analysis support the presence of mixed uranium oxidation states (+4/+5).
The compound exhibits antiferromagnetic ordering below 59 K, highlighting its complex magnetic behavior.