Synthesis, structure, and magnetic and electronic properties of Cs2Hg2USe5 |
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Authors: | Daniel E Bugaris |
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Affiliation: | Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113, USA |
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Abstract: | The compound Cs2Hg2USe5 was obtained from the solid-state reaction of U, HgSe, Cs2Se3, Se, and CsI at 1123 K. This material crystallizes in a new structure type in space group P2/n of the monoclinic system with a cell of dimensions a=10.276(6) Å, b=4.299(2) Å, c=15.432(9) Å, β=101.857(6) Å, and V=667.2(6) Å3. The structure contains layers separated by Cs atoms. Within the layers are distorted HgSe4 tetrahedra and regular USe6 octahedra. In the temperature range of 25-300 K Cs2Hg2USe5 displays Curie-Weiss paramagnetism with μeff=3.71(2) μB. The compound exhibits semiconducting behavior in the 010] direction; the conductivity at 298 K is 3×10−3 S/cm. Formal oxidation states of Cs/Hg/U/Se may be assigned as +1/+2/+4/− 2, respectively. |
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Keywords: | Uranium mercury chalcogenide Synthesis Crystal structure Magnetism Electrical conductivity |
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