Abstract
The ternary selenides LnCuSe2 (Ln=La, Ce, Pr, Nd, Sm) have been synthesized by the reaction at 1173K of Ln, Cu, and Se in a KBr or KI flux. The compounds, which are isostructural with LaCuS2, crystallize with four formula units in the space group P21/c of the monoclinic system. The structure may be thought of as consisting of layers of CuSe4 tetrahedra separated by double layers of LnSe7 monocapped trigonal prisms along the a-axis. Cell constants (Å or deg) at 153K are: LaCuSe2, 6.8142(5), 7.5817(6), 7.2052(6), 97.573(1)°; CeCuSe 2, 6.7630(5), 7.5311(6), 7.1650(6), 97.392(1)°; PrCuSe 2, 6.740(1), 7.481(1), 7.141(1), 97.374(2)°; NdCuSe2, 6.7149(6), 7.4452(7), 7.1192(6), 97.310(1)°; SmCuSe2, 6.6655(6), 7.3825(7), 7.0724(6), 97.115(1)°. There are no Se-Se bonds in the structure of LnCuSe2; the formal oxidation states of Ln/Cu/Se are 3+/1+/2-.
Original language | English (US) |
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Pages (from-to) | 760-764 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 177 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2004 |
Funding
This research was supported by the US National Science Foundation under Grant DMR00-96676 (J.A.I.) and a Ford Predoctoral Fellowship to K.M. Use was made of the MRL Central Facilities supported by the National Science Foundation at the Materials Research Center of Northwestern University under Grant DMR00-76097.
Keywords
- Crystal structure
- Rare-earth copper selenide
- Solid-state compound
- Synthesis
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry