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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on TiNb(BiO3)3 by Materials Project

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.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiNb(BiO3)3 by Materials Project

Bi3TiNbO9 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. Ti4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.80–2.33 Å. Nb5+ is bonded in a distorted octahedral geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.88–2.27 Å. There are three inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Bi–O bond distances ranging from 2.26–2.61 Å. In the second Bi3+ site, Bi3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Bi–O bond distances ranging from 2.23–2.67 Å. In the third Bi3+ site, Bi3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Bi–O bond distances ranging from 2.22–2.67 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Ti4+ and two Bi3+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Nb5+ and two Bi3+ atoms. In the third O2- site, O2- is bonded in a distorted see-saw-like geometry to one Ti4+, one Nb5+, and two equivalent Bi3+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Ti4+, one Nb5+, and two equivalent Bi3+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Ti4+, one Nb5+, and two equivalent Bi3+ atoms. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ti4+, one Nb5+, and one Bi3+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one Ti4+, one Nb5+, and one Bi3+ atom. In the eighth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the ninth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiNb(BiO3)3 by Materials Project

Bi3TiNbO9 crystallizes in the tetragonal I4mm space group. The structure is three-dimensional. Ti4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.78–2.30 Å. Nb5+ is bonded to six O2- atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 15°. There are a spread of Nb–O bond distances ranging from 1.92–2.25 Å. There are three inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are four shorter (2.32 Å) and four longer (2.88 Å) Bi–O bond lengths. In the second Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are four shorter (2.30 Å) and four longer (2.90 Å) Bi–O bond lengths. In the third Bi3+ site, Bi3+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Bi–O bond distances ranging from 2.49–3.03 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Ti4+ and four equivalent Bi3+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to one Nb5+ and four equivalent Bi3+ atoms. In the third O2- site, O2- is bonded in a distorted linear geometry to two equivalent Nb5+ and two equivalent Bi3+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ti4+ and two equivalent Bi3+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Ti4+, one Nb5+, and four equivalent Bi3+ atoms. In the sixth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra.

36 MATERIALS SCIENCE↗