Preparation and structure of the light rare-earth copper selenides LnCuSe2 (Ln=La, Ce, Pr, Nd, Sm)

Ismail Ijjaali, Kwasi Mitchell, James A. Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

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 languageEnglish (US)
Pages (from-to)760-764
Number of pages5
JournalJournal of Solid State Chemistry
Volume177
Issue number3
DOIs
StatePublished - Mar 2004

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

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