Synthesis and properties of the Co7Se8- xSx and Ni7Se8-xS x solid solutions

Virginia Lea Miller, Wei Li Lee, Gavin Lawes, Nai Phuan Ong, Robert J. Cava

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14 Scopus citations


We report the synthesis and elementary properties of the Co 7Se8-xSx (x=0-8) and Ni 7Se8-xSx (x=0-7) solid solutions. Both systems form a NiAs-type structure with metal vacancies. In general, the lattice parameters decrease with increasing x, but in the Ni7Se 8-xSx system c increases on going from x=5 to 7. Magnetic susceptibility measurements show that all samples exhibit temperature-independent paramagnetism from 25-250 K. Samples within the Co 7Se8-xSx system, as well as Ni 7Se8 and Ni7SeS7, were found to be poor metals with resistivities of ∼0.20 and ∼0.06 mΩ cm at 300 K, respectively. The Sommerfeld constant (γ) was determined from specific heat measurements to be ∼13 mJ/molCoK2 and ∼7 mJ/molNiK2 for Co7Se8-xSx and Ni7Se8-xSx, respectively.

Original languageEnglish (US)
Pages (from-to)1508-1512
Number of pages5
JournalJournal of Solid State Chemistry
Issue number5
StatePublished - May 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


  • CoSeS
  • Cobalt and nickel chalcogenides
  • Magnetic properties
  • Ni SeS


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