Synthesis of the quaternary one-dimensional triple-chain materials K3Cu3M2Q8 (M=Nb, Ta; Q=S, Se): The structure of K3Cu3Nb2S8

Ying Jie Lu*, James A. Ibers

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The one-dimensional triple-chain materials K3Cu3Nb2S8, K3Cu3Nb2Se8, K3Cu3Ta2Se8, and K3Cu3Ta2S8 have been prepared by the reactive flux method in which Cu and Nb or Ta were reacted with K2Q5/Q (Q=S, Se) at 850°C. K3Cu3Nb2S8 has been characterized by single-crystal X-ray diffraction techniques. It crystallizes with four formula units in space group C2h6-C2/c of the monoclinic system in a cell of dimensions a=23.446(3), b=5.545(3), c=14.204(3) Å, β=120.87(3)° at -120°C. It is composed of one-dimensional 1[Cu3Nb2S83- chains isolated from one another by K- cations. These chains are triple in nature, and consist of successive corner-sharing CuS4-CuS4 tetrahedra and edge-sharing CuS4-NbS4 tetrahedra. This edge-sharing results in Nb-Cu distances of 2.772(2)-2.781(1) Å. K3Cu3 Nb2Se8 with cell dimensions a=23.453(4), b=5.592(12), c=14.223(3) Å, β=120.7(3)° at -120°C (λ(CuKα1)=1.54056 Å); K3Cu3Ta2Se8 with cell dimensions a=23.493(9), b=5.538(7), c=14.204(12) Å, β=120.5(9)° at -165°C (λ(MoKα1)=0.70930 Å); and K3Cu3Ta2S8 with cell dimensions a=23.450(6), b=5.541(3), c=14.110(6) Å, β=120.47(3)° at -165°C (λ(MoKα1)=0.70930 Å) appear to be isostructural with K3Cu3Nb2S8. K3Cu3Nb2S8 has a resistivity greater than 105 mΩ cm at room temperature.

Original languageEnglish (US)
Pages (from-to)312-317
Number of pages6
JournalJournal of Solid State Chemistry
Issue number2
StatePublished - Jun 1992

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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