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CoGa is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Co is bonded in a body-centered cubic geometry to eight equivalent Ga atoms. All Co–Ga bond lengths are 2.50 Å. Ga is bonded in a body-centered cubic geometry to eight equivalent Co atoms.
CoGa3 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Co is bonded in a 8-coordinate geometry to eight Ga atoms. There are a spread of Co–Ga bond distances ranging from 2.37–2.49 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a distorted linear geometry to two equivalent Co atoms. In the second Ga site, Ga is bonded in a 8-coordinate geometry to three equivalent Co atoms.