Abstract
Two new ternary lanthanide (Ln) uranium selenides, Er3USe8 and Yb3USe8, were synthesized at 1198 K using NaI as a flux. Single-crystal X-ray studies show these two compounds to be isostructural and to crystallize in space group D2h11-Pbcm of the orthorhombic crystal system. The Ln and U atoms are disordered on the same crystallographic site in these crystal structures. Each Ln/U atom is coordinated to eight Se atoms in a bicapped trigonal prism, and sharing of these (Ln/U)Se8 units creates a three-dimensional network. Se2 atoms are connected to each other to form infinite one-dimensional chains along the c axis. In these chains, the two Se atoms are separated by about 2.74 Å, a distance intermediate to those of a Se-Se single bond and a van der Waals interaction. Temperature-dependent resistivity measurements show that Er3USe8 and Yb3USe8 are semiconductors with activation energies of 0.08(1) and 0.17(1) eV, respectively.
Original language | English (US) |
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Pages (from-to) | 90-94 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 233 |
DOIs | |
State | Published - Jan 1 2016 |
Funding
Use was made of the IMSERC X-ray Facility at Northwestern University, supported by the International Institute of Nanotechnology (IIN). C.D.M. was supported by the U.S. Department of Energy, Office of Basic Energy Sciences , under Contract no. DE-AC02-06CH11357 .
Keywords
- Crystal structure
- Lanthanide uranium selenides
- Resistivity
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry
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CSD 1789537: Experimental Crystal Structure Determination
Prakash, J. (Creator), Mesbah, A. (Creator), Beard, J. C. (Creator), Malliakas, C. D. (Creator) & Ibers, J. A. (Creator), FIZ Karlsruhe – Leibniz Institute for Information Infrastructure, 2016
DOI: 10.25505/fiz.icsd.cc1y2506, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.25505/fiz.icsd.cc1y2506&sid=DataCite
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