We have prepared single crystals of a new ternary barium cobalt sulfide, Ba6Co25S27, by cooling a melt containing BaS, CoS, and Co from 975 °C. The structure, determined by single-crystal X-ray diffraction, is cubic (Pm3m) with a = 10.033 (3) Å, Z = 1, 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 Ba6Co25S27is a poor metal with a resistance minimum at 8 K and is Pauli paramagnetic with a small Curie contribution indicating that either the Co8cluster or the octahedrally coordinated cobalt atom has a magnetic moment.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry