Materials Data on Ba2NbP2O9F by Materials Project
Ba2NbP2O9F crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to eight O2- and one F1- atom. There are a spread of Ba–O bond distances ranging from 2.66–3.18 Å. The Ba–F bond length is 2.82 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to eight O2- and one F1- atom. There are a spread of Ba–O bond distances ranging from 2.69–3.17 Å. The Ba–F bond length is 2.73 Å. Nb5+ is bonded to five O2- and one F1- atom to form NbO5F octahedra that share corners with four PO4 tetrahedra. There are a spread of Nb–O bond distances ranging from 1.79–2.05 Å. The Nb–F bond length is 2.16 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent NbO5F octahedra. The corner-sharing octahedra tilt angles range from 38–42°. There are a spread of P–O bond distances ranging from 1.52–1.59 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent NbO5F octahedra. The corner-sharing octahedra tilt angles range from 33–46°. There are a spread of P–O bond distances ranging from 1.52–1.58 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ba2+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ba2+ and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Ba2+, one Nb5+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ba2+, one Nb5+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ba2+, one Nb5+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Ba2+, one Nb5+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one Nb5+ atom. F1- is bonded in a 3-coordinate geometry to two Ba2+ and one Nb5+ atom.