DOI: 10.17188/1270266
title: Materials Data on Na2Ce2TiSi(CO6)2 by Materials Project

description: Na2Ce2TiSi(CO6)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.36–2.56 Å. In the second Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with four equivalent TiO6 octahedra, corners with two equivalent SiO4 tetrahedra, and edges with two equivalent SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 66°. There are a spread of Na–O bond distances ranging from 2.43–2.48 Å. In the third Na1+ site, Na1+ is bonded in a distorted octahedral geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.24–2.86 Å. There are two inequivalent Ce3+ sites. In the first Ce3+ site, Ce3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ce–O bond distances ranging from 2.38–2.81 Å. In the second Ce3+ site, Ce3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ce–O bond distances ranging from 2.38–2.72 Å. Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent NaO6 octahedra, corners with two equivalent SiO4 tetrahedra, and edges with two equivalent TiO6 octahedra. The corner-sharing octahedral tilt angles are 66°. There are a spread of Ti–O bond distances ranging from 1.95–2.06 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO6 octahedra, corners with two equivalent TiO6 octahedra, and an edgeedge with one NaO6 octahedra. The corner-sharing octahedra tilt angles range from 44–70°. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.28–1.33 Å. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.28–1.32 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Ce3+, and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two Ce3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three Ce3+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, one Ce3+, and one C4+ atom. In the sixth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Na1+, one Ce3+, one Ti4+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, one Ce3+, and one C4+ atom. In the eighth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Na1+, one Ce3+, one Ti4+, and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to one Ce3+ and two equivalent Ti4+ atoms. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to three Ce3+ and one C4+ atom. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+, one Ce3+, and one C4+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to one Ce3+ and two equivalent Ti4+ atoms.