Synthesis, Structure and Properties of Ba6Co25S27: A Perkovite-Like Superstructure of Co8S6 and Ba6S Clusters

Abstract

We have prepared single crystals of a new ternary barium cobalt sulfide, Ba6Co25S27 by cooling a melt containing BaS, CoS and Co from 975 deg C. The structure, determined by single crystal X-ray diffraction, is cubic (Pm3M) with a = 10.033(3)A, Z=l, and R= 2.6%, Rw= 2.4%. The structure contains an octahedrally coordinated cobalt atom, nearly cubic clusters of eight cobalt atoms, and an unusual arrangement of barium atoms. The electric resistivity and magnetic susceptibility measurements show that Ba6Co25S27 is a poor metal with a resistance minimum at 8K, and Pauli paramagnetic with a small Curie contribution indicating that either the Co8 cluster or the octahedrally coordinated cobalt atom has a magnetic moment. Solid State Sulfides, Electrical and magnetic Properties, Metal Clusters.

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Document Details

Document Type
Technical Report
Publication Date
Feb 24, 1992
Accession Number
ADA251041

Entities

People

  • F. J. Disalvo
  • G. Jeffrey Snyder
  • Michael E. Badding

Organizations

  • Cornell University Department of Chemistry and Chemical Biology

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Copper Oxides
  • Diffraction
  • High Temperature
  • Inorganic Chemistry
  • Low Temperature
  • Magnetic Moments
  • Magnetic Properties
  • Materials
  • Materials Science
  • Measurement
  • Military Research
  • Phase Transformations
  • Quantum Properties
  • Scattering
  • Transition Metals
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Molecular Photonics/Laser Physics