Materials Data on Na4Sn2Ge5O17 by Materials Project

Na4Sn2Ge5O17 crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Na–O bond distances ranging from 2.30–2.55 Å. In the second Na site, Na is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.40–2.87 Å. Sn is bonded to six O atoms to form SnO6 octahedra that share corners with six GeO4 tetrahedra. There are a spread of Sn–O bond distances ranging from 2.07–2.12 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with two equivalent SnO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There is two shorter (1.75 Å) and two longer (1.79 Å) Ge–O bond length. In the second Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with three equivalent SnO6 octahedra and a cornercorner with one GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 40–55°. There are a spread of Ge–O bond distances ranging from 1.76–1.82 Å. In the third Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with two equivalent SnO6 octahedra and corners with two GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–54°. There are a spread of Ge–O bond distances ranging from 1.76–1.81 Å. There are nine inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to one Na, one Sn, and one Ge atom. In the second O site, O is bonded to two equivalent Na, one Sn, and one Ge atom to form distorted edge-sharing ONa2SnGe trigonal pyramids. In the third O site, O is bonded in a 3-coordinate geometry to one Na and two Ge atoms. In the fourth O site, O is bonded in a trigonal planar geometry to one Na and two Ge atoms. In the fifth O site, O is bonded in a 3-coordinate geometry to two equivalent Na, one Sn, and one Ge atom. In the sixth O site, O is bonded in a distorted T-shaped geometry to one Na, one Sn, and one Ge atom. In the seventh O site, O is bonded in an L-shaped geometry to two equivalent Na atoms. In the eighth O site, O is bonded in a distorted trigonal planar geometry to one Na, one Sn, and one Ge atom. In the ninth O site, O is bonded in a distorted trigonal planar geometry to one Na, one Sn, and one Ge atom.