Materials Data on CaSiSnO5 by Materials Project
CaSnSiO5 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ca2+ is bonded in a 5-coordinate geometry to seven O2- atoms. There are a spread of Ca–O bond distances ranging from 2.24–2.82 Å. There are two inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with two equivalent SnO6 octahedra and corners with four equivalent SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. There are two shorter (1.99 Å) and four longer (2.13 Å) Sn–O bond lengths. In the second Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with two equivalent SnO6 octahedra and corners with four equivalent SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. There are a spread of Sn–O bond distances ranging from 1.99–2.14 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four SnO6 octahedra. The corner-sharing octahedra tilt angles range from 42–54°. All Si–O bond lengths are 1.66 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to one Ca2+ and two Sn4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Sn4+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Sn4+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+, one Sn4+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Ca2+, one Sn4+, and one Si4+ atom.