Single Crystal Structural Investigations on NiyMo6Se8-xSx Solid Solution: A New Location of Nickel Counterions

The structures of nickel sulfoselenide Chevrel phases have been determined. All the richest nickel phases crystallize in rhombohedral symmetry. A single-crystal structural study makes it possible to identify the special nickel cation locations inside the host network for both pure sulfide and selenide Chevrel phases. We also show that these nickel atoms can form some kind of cluster in the cavities of the host or Ni-Mo bondings.