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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na2LiAlF6 by Materials Project

Na2LiAlF6 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Na1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Na–F bond distances ranging from 2.32–2.66 Å. Li1+ is bonded to six F1- atoms to form LiF6 octahedra that share corners with six equivalent AlF6 octahedra. The corner-sharing octahedra tilt angles range from 26–28°. There are a spread of Li–F bond distances ranging from 2.06–2.09 Å. Al3+ is bonded to six F1- atoms to form AlF6 octahedra that share corners with six equivalent LiF6 octahedra. The corner-sharing octahedra tilt angles range from 26–28°. There is four shorter (1.83 Å) and two longer (1.84 Å) Al–F bond length. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a 4-coordinate geometry to two equivalent Na1+, one Li1+, and one Al3+ atom. In the second F1- site, F1- is bonded in a 5-coordinate geometry to three equivalent Na1+, one Li1+, and one Al3+ atom. In the third F1- site, F1- is bonded in a 5-coordinate geometry to three equivalent Na1+, one Li1+, and one Al3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3Li3Al2F12 by Materials Project

Li3Na3Al2F12 is Esseneite-like structured and crystallizes in the cubic Ia-3d space group. The structure is three-dimensional. Na1+ is bonded in a distorted body-centered cubic geometry to eight equivalent F1- atoms. There are four shorter (2.39 Å) and four longer (2.58 Å) Na–F bond lengths. Li1+ is bonded to four equivalent F1- atoms to form LiF4 tetrahedra that share corners with four equivalent AlF6 octahedra. The corner-sharing octahedral tilt angles are 44°. All Li–F bond lengths are 1.88 Å. Al3+ is bonded to six equivalent F1- atoms to form AlF6 octahedra that share corners with six equivalent LiF4 tetrahedra. All Al–F bond lengths are 1.84 Å. F1- is bonded in a 4-coordinate geometry to two equivalent Na1+, one Li1+, and one Al3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaLi2AlF6 by Materials Project

NaLi2AlF6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Na1+ is bonded to six equivalent F1- atoms to form NaF6 octahedra that share corners with six equivalent AlF6 octahedra and faces with eight equivalent LiF12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Na–F bond lengths are 2.15 Å. Li1+ is bonded to twelve equivalent F1- atoms to form distorted LiF12 cuboctahedra that share corners with twelve equivalent LiF12 cuboctahedra, faces with six equivalent LiF12 cuboctahedra, faces with four equivalent NaF6 octahedra, and faces with four equivalent AlF6 octahedra. All Li–F bond lengths are 2.81 Å. Al3+ is bonded to six equivalent F1- atoms to form AlF6 octahedra that share corners with six equivalent NaF6 octahedra and faces with eight equivalent LiF12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Al–F bond lengths are 1.81 Å. F1- is bonded in a linear geometry to one Na1+, four equivalent Li1+, and one Al3+ atom.

36 MATERIALS SCIENCE↗