Abstract
The compound Ba2Cu2ThS5 has been synthesized by the reaction of BaS, S, Cu, and Th at 1173 K. It crystallizes in the monoclinic space group C2h3-C2/m with two formula units in a cell of dimensions a=13.5616(8) Å, b=4.1159(2) Å, c=9.3548(6) Å, β=115.89(1)° (100 K). The structure comprises Ba2+ cations and [Cu2ThS54-]∞2 layers. The two dimensional layers are formed by the connection of ThS6 octahedra and CuS4 tetrahedra along [001] with a sequence.... oct tet tet oct tet tet.... Optical measurements performed on Ba2Cu2ThS5 indicate an indirect band gap of 1.86 eV. DFT calculations performed with the HSE06 functional yield band gaps of 1.7 eV for Ba2Cu2ThS5 and 1.5 eV for the isostructural compound Ba2Cu2US5.
Original language | English (US) |
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Pages (from-to) | 349-353 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 200 |
DOIs | |
State | Published - Apr 2013 |
Funding
This research was kindly supported at Northwestern University by the U.S. Department of energy, Basic Energy Sciences, Chemical Sciences, Biosciences, and Geosciences Division and Division of Materials Science and Engineering Grant ER-15522 . Use was made of the IMSERC X-ray Facility at Northwestern University, supported by the International Institute of Nanotechnology (IIN) . Funding for optical studies was provided by the National Science Foundation Grant CHE-1152547 and the NSF MRSEC ( DMR-1121262 ) at the Materials Research Center of Northwestern University .
Keywords
- Band gaps
- Barium copper actinide sulfides
- Electronic structures
- Optical properties
- Single-crystal X-ray structure
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry