Materials Data on KLi3Si12(SnO15)2 by Materials Project
KLi3Si12(SnO15)2 crystallizes in the hexagonal P6/mcc space group. The structure is three-dimensional. K1+ is bonded in a 12-coordinate geometry to twelve equivalent O2- atoms. All K–O bond lengths are 3.10 Å. Li1+ is bonded in a distorted rectangular see-saw-like geometry to four equivalent O2- atoms. All Li–O bond lengths are 1.95 Å. Sn4+ is bonded to six equivalent O2- atoms to form SnO6 octahedra that share corners with six equivalent SiO4 tetrahedra. All Sn–O bond lengths are 2.06 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one SnO6 octahedra and corners with three equivalent SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 39°. There are a spread of Si–O bond distances ranging from 1.61–1.64 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to one K1+ and two equivalent Si4+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Sn4+, and one Si4+ atom.