Materials Data on NbBi2O5F by Materials Project
Bi2NbO5F crystallizes in the orthorhombic Pca2_1 space group. The structure is three-dimensional. Nb5+ is bonded to five O2- and one F1- atom to form distorted corner-sharing NbO5F octahedra. The corner-sharing octahedra tilt angles range from 14–41°. There are a spread of Nb–O bond distances ranging from 1.89–2.09 Å. The Nb–F bond length is 2.24 Å. There are two inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a 7-coordinate geometry to five O2- and three equivalent F1- atoms. There are a spread of Bi–O bond distances ranging from 2.28–2.86 Å. There are a spread of Bi–F bond distances ranging from 2.56–3.02 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 2.24–2.69 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Nb5+ and two equivalent Bi3+ atoms. In the second O2- site, O2- is bonded to four equivalent Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the third O2- site, O2- is bonded to four equivalent Bi3+ atoms to form a mixture of distorted edge and corner-sharing OBi4 tetrahedra. In the fourth O2- site, O2- is bonded in a distorted linear geometry to two equivalent Nb5+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Nb5+ and one Bi3+ atom. F1- is bonded in a 1-coordinate geometry to one Nb5+ and three equivalent Bi3+ atoms.