We have reinvestigated the crystal structure of a spinel-type ${\mathrm{CuIr}}_2{\mathrm{S}}_4$ at low temperatures using a single crystal in a synchrotron radiation x-ray diffraction experiment. The crystal structure of the low-temperature phase of ${\mathrm{CuIr}}_2{\mathrm{S}}_4$ has been already studied by diffraction experiments using a powder sample, and it has been reported that the formation of dimer molecules accompanied by charge ordering of Ir has been achieved. The crystal structure of the low-temperature phase obtained in our reanalysis was the same as the previously reported structure in that it showed the formation of Ir dimers accompanied by charge ordering, but the charge-ordering pattern and arrangement of the dimers in the unit cell were different. We will discuss the validity of the structure obtained in this study and provide the structural parameters revealed in the reanalysis. The results of this study should provide a basis for further studies of the physical properties of ${\mathrm{CuIr}}_2{\mathrm{S}}_4$, which are still being actively investigated.

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• Chemical bonding
• Crystal structure
• Metal-insulator transition
• Phase transitions
• Structural properties
• Spinels
• Strongly correlated systems
• Neutron diffraction
• X-ray diffraction