Materials Data on Li2MgTi9O20 by Materials Project
Li2MgTi9O20 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Li–O bond distances ranging from 2.04–2.31 Å. In the second Li1+ site, Li1+ is bonded to six O2- atoms to form distorted LiO6 octahedra that share corners with two equivalent TiO6 octahedra and edges with six TiO6 octahedra. The corner-sharing octahedral tilt angles are 29°. There are a spread of Li–O bond distances ranging from 1.98–2.26 Å. Mg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Mg–O bond distances ranging from 2.01–2.22 Å. There are five inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form distorted TiO6 octahedra that share a cornercorner with one LiO6 octahedra, corners with three TiO6 octahedra, an edgeedge with one LiO6 octahedra, and edges with three TiO6 octahedra. The corner-sharing octahedra tilt angles range from 29–54°. There are a spread of Ti–O bond distances ranging from 1.78–2.21 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with three TiO6 octahedra, an edgeedge with one LiO6 octahedra, and edges with three TiO6 octahedra. The corner-sharing octahedra tilt angles range from 29–49°. There are a spread of Ti–O bond distances ranging from 1.89–2.11 Å. In the third Ti4+ site, Ti4+ is bonded to six O2- atoms to form distorted TiO6 octahedra that share corners with three TiO6 octahedra, an edgeedge with one LiO6 octahedra, and edges with three TiO6 octahedra. The corner-sharing octahedra tilt angles range from 30–44°. There are a spread of Ti–O bond distances ranging from 1.83–2.25 Å. In the fourth Ti4+ site, Ti4+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing TiO6 octahedra. The corner-sharing octahedra tilt angles range from 30–44°. There are a spread of Ti–O bond distances ranging from 1.82–2.18 Å. In the fifth Ti4+ site, Ti4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ti–O bond distances ranging from 1.91–2.15 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded to one Li1+, one Mg2+, and two equivalent Ti4+ atoms to form distorted OLiMgTi2 trigonal pyramids that share corners with four OLiMgTi2 trigonal pyramids and edges with four OMgTi3 trigonal pyramids. In the second O2- site, O2- is bonded to one Li1+, one Mg2+, and two equivalent Ti4+ atoms to form distorted OLiMgTi2 trigonal pyramids that share corners with four OLiMgTi2 trigonal pyramids and edges with four OMgTi3 trigonal pyramids. In the third O2- site, O2- is bonded to one Li1+ and three Ti4+ atoms to form a mixture of distorted edge and corner-sharing OLiTi3 trigonal pyramids. In the fourth O2- site, O2- is bonded to one Li1+ and three Ti4+ atoms to form a mixture of distorted edge and corner-sharing OLiTi3 trigonal pyramids. In the fifth O2- site, O2- is bonded to one Mg2+ and three Ti4+ atoms to form distorted OMgTi3 trigonal pyramids that share corners with four OLiTi3 trigonal pyramids and edges with four OLiMgTi2 trigonal pyramids. In the sixth O2- site, O2- is bonded to one Li1+ and three Ti4+ atoms to form distorted OLiTi3 trigonal pyramids that share corners with four OLiTi3 trigonal pyramids and edges with four OLiMgTi2 trigonal pyramids. In the seventh O2- site, O2- is bonded to one Li1+ and three Ti4+ atoms to form distorted OLiTi3 trigonal pyramids that share corners with four OLiMgTi2 trigonal pyramids and edges with four OLiTi3 trigonal pyramids. In the eighth O2- site, O2- is bonded to four Ti4+ atoms to form distorted OTi4 trigonal pyramids that share corners with four OLiMgTi2 trigonal pyramids and edges with four OLiTi3 trigonal pyramids. In the ninth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Mg2+ and two Ti4+ atoms. In the tenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Li1+ and two Ti4+ atoms. In the eleventh O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+ and two Ti4+ atoms. In the twelfth O2- site, O2- is bonded in a distorted T-shaped geometry to three Ti4+ atoms.