Materials Data on NaLiB4O7 by Materials Project
LiNaB4O7 crystallizes in the orthorhombic Fdd2 space group. The structure is three-dimensional. Na1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.31–2.50 Å. Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share a cornercorner with one LiO4 tetrahedra and corners with five BO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.96–2.29 Å. There are four inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share a cornercorner with one BO4 tetrahedra and corners with three equivalent LiO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.46–1.51 Å. In the second B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share a cornercorner with one BO4 tetrahedra and corners with two equivalent LiO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.47–1.52 Å. In the third B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.36–1.39 Å. In the fourth B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.36 Å) and two longer (1.39 Å) B–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+ and two B3+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to one Li1+ and two B3+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Li1+, and two B3+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Li1+, and two B3+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+ and two B3+ atoms. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two B3+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Li1+ and two equivalent B3+ atoms. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Na1+ and two equivalent B3+ atoms.