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Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
CoBiO4BiO2 crystallizes in the tetragonal P4mm space group. The structure is two-dimensional and consists of one BiO2 sheet oriented in the (0, 0, 1) direction and one CoBiO4 sheet oriented in the (0, 0, 1) direction. In the BiO2 sheet, Bi4+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. All Bi–O bond lengths are 2.24 Å. O2- is bonded in a bent 120 degrees geometry to two equivalent Bi4+ atoms. In the CoBiO4 sheet, Co4+ is bonded to six O2- atoms to form distorted corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are a spread of Co–O bond distances ranging from 1.69–1.92 Å. Bi4+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.38 Å) and four longer (2.67 Å) Bi–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Co4+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Co4+ and two equivalent Bi4+ atoms. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Co4+ and four equivalent Bi4+ atoms.
FeCo(BiO3)2 crystallizes in the tetragonal P4mm space group. The structure is three-dimensional. Fe3+ is bonded in a 5-coordinate geometry to five O2- atoms. There is one shorter (1.82 Å) and four longer (2.04 Å) Fe–O bond length. Co3+ is bonded in a 5-coordinate geometry to five O2- atoms. There is one shorter (1.76 Å) and four longer (2.03 Å) Co–O bond length. There are two inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.30 Å) and four longer (2.84 Å) Bi–O bond lengths. In the second Bi3+ site, Bi3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.30 Å) and four longer (2.85 Å) Bi–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Co3+ and four equivalent Bi3+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Fe3+ and four equivalent Bi3+ atoms. In the third O2- site, O2- is bonded to two equivalent Co3+ and two equivalent Bi3+ atoms to form a mixture of distorted corner and edge-sharing OCo2Bi2 tetrahedra. In the fourth O2- site, O2- is bonded to two equivalent Fe3+ and two equivalent Bi3+ atoms to form a mixture of distorted corner and edge-sharing OFe2Bi2 tetrahedra.
Bi2Sr2CuO6 crystallizes in the orthorhombic Cccm space group. The structure is two-dimensional and consists of two Bi2Sr2CuO6 sheets oriented in the (0, 1, 0) direction. Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.58–3.02 Å. Cu2+ is bonded in a distorted square co-planar geometry to six O2- atoms. There are four shorter (1.89 Å) and two longer (2.69 Å) Cu–O bond lengths. Bi3+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Bi–O bond distances ranging from 2.06–2.59 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Cu2+ atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Cu2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second O2- site, O2- is bonded in a distorted see-saw-like geometry to one Sr2+ and three equivalent Bi3+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four equivalent Sr2+, one Cu2+, and one Bi3+ atom.
Bi3TiNbO9 crystallizes in the tetragonal I4mm space group. The structure is two-dimensional and consists of two water molecules; two Bi2O3 sheets oriented in the (0, 0, 1) direction; and two TiNbBiO5 sheets oriented in the (0, 0, 1) direction. In each Bi2O3 sheet, there are two inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. All Bi–O bond lengths are 2.14 Å. In the second Bi3+ site, Bi3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.46 Å) and four longer (2.61 Å) Bi–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of distorted edge and corner-sharing OBi4 tetrahedra. In the second O2- site, O2- is bonded in a distorted square co-planar geometry to four equivalent Bi3+ atoms. In each TiNbBiO5 sheet, Ti4+ is bonded to five O2- atoms to form corner-sharing TiO5 square pyramids. There is four shorter (1.84 Å) and one longer (1.93 Å) Ti–O bond length. Nb5+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. All Nb–O bond lengths are 2.05 Å. Bi3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.48 Å) and four longer (2.59 Å) Bi–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Nb5+ and two equivalent Bi3+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Ti4+ atoms. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Ti4+ and four equivalent Bi3+ atoms.