Materials Data on Li2AlNiO4 by Materials Project
Li2NiAlO4 is Stannite-like structured and crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with four equivalent LiO4 tetrahedra, corners with four equivalent NiO4 tetrahedra, and corners with four equivalent AlO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.97–2.00 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with four equivalent LiO4 tetrahedra, corners with four equivalent NiO4 tetrahedra, and corners with four equivalent AlO4 tetrahedra. There are a spread of Li–O bond distances ranging from 2.00–2.02 Å. Ni3+ is bonded to four O2- atoms to form NiO4 tetrahedra that share corners with four equivalent AlO4 tetrahedra and corners with eight LiO4 tetrahedra. There are a spread of Ni–O bond distances ranging from 1.85–1.87 Å. Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with four equivalent NiO4 tetrahedra and corners with eight LiO4 tetrahedra. There is one shorter (1.78 Å) and three longer (1.79 Å) Al–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two Li1+, one Ni3+, and one Al3+ atom to form corner-sharing OLi2AlNi tetrahedra. In the second O2- site, O2- is bonded to two Li1+, one Ni3+, and one Al3+ atom to form corner-sharing OLi2AlNi tetrahedra. In the third O2- site, O2- is bonded to two Li1+, one Ni3+, and one Al3+ atom to form corner-sharing OLi2AlNi tetrahedra. In the fourth O2- site, O2- is bonded to two Li1+, one Ni3+, and one Al3+ atom to form corner-sharing OLi2AlNi tetrahedra.