Seven new rare-earth transition-metal oxychalcogenides: Syntheses and characterization of Ln4MnOSe6 (Ln=La, Ce, Nd), Ln 4FeOSe6 (Ln=La, Ce, Sm), and La4MnOS 6

Ismail Ijjaali, Bin Deng, James A Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The quaternary oxychalcogenides Ln4MnOSe6 (Ln=La, Ce, Nd), Ln4FeOSe6 (Ln=La, Ce, Sm), and La 4MnOS6 have been synthesized by the reactions of Ln (Ln=La, Ce, Nd, Sm), M (M=Mn, Fe), Se, and SeO2 at 1173 K for the selenides or by the reaction of La2S3 and MnO at 1173 K for the sulfide. Warning: These reactions frequently end in explosions. These isostructural compounds crystallize with two formula units in space group C6v4-P63mc of the hexagonal system. The cell constants (a, c in Å) at 153 K are: La4MnOSe6, 9.7596(3), 7.0722(4); La 4FeOSe6, 9.7388(4), 7.0512(5); Ce4MnOSe 6, 9.6795(4), 7.0235(5); Ce4FeOSe6, 9.6405(6), 6.9888(4); Nd4MnOSe6, 9.5553(5), 6.9516(5); Sm 4FeOSe6, 9.4489(5), 6.8784(5); and La4MnOS 6, 9.4766(6), 6.8246(6). The structure of these Ln 4MOQ6 compounds comprises a three-dimensional framework of interconnected LnOQ7 bicapped trigonal prisms, MQ6 octahedra, and the unusual LnOQ6 tricapped tetrahedra.

Original languageEnglish (US)
Pages (from-to)1503-1507
Number of pages5
JournalJournal of Solid State Chemistry
Volume178
Issue number5
DOIs
StatePublished - May 1 2005

Keywords

  • Crystal structure
  • Iron
  • Manganese
  • Oxychalcogenide
  • Rare earth
  • 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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