DOI: 10.17188/1299787
title: Materials Data on Li6Ti2O7 by Materials Project

description: Li6Ti2O7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to five O2- atoms to form LiO5 square pyramids that share corners with five LiO5 square pyramids, corners with four equivalent LiO5 trigonal bipyramids, edges with four TiO6 octahedra, and edges with four LiO5 square pyramids. There are a spread of Li–O bond distances ranging from 1.98–2.12 Å. In the second Li1+ site, Li1+ is bonded to five O2- atoms to form LiO5 square pyramids that share corners with seven LiO5 square pyramids, corners with two equivalent LiO5 trigonal bipyramids, edges with four TiO6 octahedra, edges with three LiO5 square pyramids, and an edgeedge with one LiO5 trigonal bipyramid. There are a spread of Li–O bond distances ranging from 2.00–2.08 Å. In the third Li1+ site, Li1+ is bonded to five O2- atoms to form distorted LiO5 square pyramids that share corners with three equivalent TiO6 octahedra, corners with five LiO5 square pyramids, a cornercorner with one LiO5 trigonal bipyramid, edges with three TiO6 octahedra, edges with four LiO5 square pyramids, and an edgeedge with one LiO5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 3–14°. There are a spread of Li–O bond distances ranging from 1.96–2.27 Å. In the fourth Li1+ site, Li1+ is bonded to five O2- atoms to form LiO5 square pyramids that share corners with three equivalent TiO6 octahedra, corners with five LiO5 square pyramids, a cornercorner with one LiO5 trigonal bipyramid, edges with three TiO6 octahedra, edges with four LiO5 square pyramids, and an edgeedge with one LiO5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 3–13°. There are a spread of Li–O bond distances ranging from 1.96–2.25 Å. In the fifth Li1+ site, Li1+ is bonded to five O2- atoms to form LiO5 square pyramids that share corners with eight LiO5 square pyramids, a cornercorner with one LiO5 trigonal bipyramid, edges with four TiO6 octahedra, edges with three LiO5 square pyramids, and an edgeedge with one LiO5 trigonal bipyramid. There are a spread of Li–O bond distances ranging from 1.99–2.09 Å. In the sixth Li1+ site, Li1+ is bonded to five O2- atoms to form LiO5 trigonal bipyramids that share corners with nine LiO5 square pyramids, edges with four TiO6 octahedra, and edges with four LiO5 square pyramids. There are a spread of Li–O bond distances ranging from 1.98–2.12 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with three equivalent TiO6 octahedra, corners with three equivalent LiO5 square pyramids, an edgeedge with one TiO6 octahedra, edges with nine LiO5 square pyramids, and edges with two equivalent LiO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 2–4°. There are a spread of Ti–O bond distances ranging from 1.86–2.12 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with three equivalent TiO6 octahedra, corners with three equivalent LiO5 square pyramids, an edgeedge with one TiO6 octahedra, edges with nine LiO5 square pyramids, and edges with two equivalent LiO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 2–4°. There are a spread of Ti–O bond distances ranging from 1.86–2.11 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded to four Li1+ and two Ti4+ atoms to form OLi4Ti2 octahedra that share corners with six OLi5Ti octahedra and edges with ten OLi4Ti2 octahedra. The corner-sharing octahedra tilt angles range from 1–18°. In the second O2- site, O2- is bonded to four Li1+ and two Ti4+ atoms to form a mixture of corner and edge-sharing OLi4Ti2 octahedra. The corner-sharing octahedra tilt angles range from 7–20°. In the third O2- site, O2- is bonded to five Li1+ and one Ti4+ atom to form a mixture of corner and edge-sharing OLi5Ti octahedra. The corner-sharing octahedra tilt angles range from 1–17°. In the fourth O2- site, O2- is bonded to four Li1+ and two Ti4+ atoms to form a mixture of corner and edge-sharing OLi4Ti2 octahedra. The corner-sharing octahedra tilt angles range from 6–20°. In the fifth O2- site, O2- is bonded to four Li1+ and two Ti4+ atoms to form a mixture of corner and edge-sharing OLi4Ti2 octahedra. The corner-sharing octahedra tilt angles range from 4–19°. In the sixth O2- site, O2- is bonded to five Li1+ and one Ti4+ atom to form a mixture of corner and edge-sharing OLi5Ti octahedra. The corner-sharing octahedra tilt angles range from 1–18°. In the seventh O2- site, O2- is bonded to four Li1+ and two Ti4+ atoms to form a mixture of corner and edge-sharing OLi4Ti2 octahedra. The corner-sharing octahedra tilt angles range from 4–18°.