Materials Data on Li6Ge2O7 by Materials Project
Li6Ge2O7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are six inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share corners with four GeO4 tetrahedra, corners with six LiO4 tetrahedra, and an edgeedge with one GeO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.90–2.32 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with four GeO4 tetrahedra, corners with five LiO4 tetrahedra, and edges with three LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.89–2.03 Å. In the third Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with four GeO4 tetrahedra, corners with nine LiO4 tetrahedra, and an edgeedge with one LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.96–2.13 Å. In the fourth Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share corners with four GeO4 tetrahedra, corners with seven LiO4 tetrahedra, and edges with two LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.91–2.10 Å. In the fifth Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share corners with four GeO4 tetrahedra, corners with seven LiO4 tetrahedra, and edges with two LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.94–2.05 Å. In the sixth Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share corners with four GeO4 tetrahedra, corners with six LiO4 tetrahedra, and edges with three LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 2.00–2.17 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share a cornercorner with one GeO4 tetrahedra, corners with eleven LiO4 tetrahedra, and an edgeedge with one LiO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.75–1.87 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share a cornercorner with one GeO4 tetrahedra and corners with thirteen LiO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.75–1.86 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to four Li1+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to four Li1+ and one Ge4+ atom. In the third O2- site, O2- is bonded to three Li1+ and one Ge4+ atom to form a mixture of corner and edge-sharing OLi3Ge tetrahedra. In the fourth O2- site, O2- is bonded to two equivalent Li1+ and two Ge4+ atoms to form a mixture of distorted corner and edge-sharing OLi2Ge2 tetrahedra. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to four Li1+ and one Ge4+ atom. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to four Li1+ and one Ge4+ atom. In the seventh O2- site, O2- is bonded to three Li1+ and one Ge4+ atom to form corner-sharing OLi3Ge tetrahedra.