Materials Data on Na2TiSi4H2O13 by Materials Project

Na2TiSi4H2O13 crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. Na is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.34–2.46 Å. Ti is bonded to six O atoms to form TiO6 octahedra that share corners with six SiO4 tetrahedra. There are a spread of Ti–O bond distances ranging from 1.94–2.00 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent TiO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 33–41°. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one TiO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. There are seven inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the second O site, O is bonded in a distorted trigonal planar geometry to one Na, one Ti, and one Si atom. In the third O site, O is bonded in a 3-coordinate geometry to one Na, one Ti, and one Si atom. In the fourth O site, O is bonded in a 3-coordinate geometry to one Na and two Si atoms. In the fifth O site, O is bonded in a linear geometry to two equivalent Si atoms. In the sixth O site, O is bonded in a distorted single-bond geometry to two equivalent Na and one H atom. In the seventh O site, O is bonded in a 3-coordinate geometry to one Na, one Ti, and one Si atom.