Materials Data on Ga2CoO4 by Materials Project
CoGa2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Co2+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six equivalent GaO4 tetrahedra, edges with two equivalent CoO6 octahedra, and edges with four equivalent GaO6 octahedra. There are four shorter (2.07 Å) and two longer (2.13 Å) Co–O bond lengths. There are two inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded to four O2- atoms to form GaO4 tetrahedra that share corners with six equivalent CoO6 octahedra and corners with six equivalent GaO6 octahedra. The corner-sharing octahedra tilt angles range from 56–57°. There is two shorter (1.89 Å) and two longer (1.92 Å) Ga–O bond length. In the second Ga3+ site, Ga3+ is bonded to six O2- atoms to form GaO6 octahedra that share corners with six equivalent GaO4 tetrahedra, edges with two equivalent GaO6 octahedra, and edges with four equivalent CoO6 octahedra. There are two shorter (2.00 Å) and four longer (2.04 Å) Ga–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Co2+ and three Ga3+ atoms. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Co2+ and two Ga3+ atoms.