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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na6Fe2B4SO16 by Materials Project

Na6Fe2B4SO16 crystallizes in the cubic Fd-3 space group. The structure is three-dimensional. Na is bonded in a distorted hexagonal planar geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.39–2.53 Å. Fe is bonded in an octahedral geometry to six equivalent O atoms. All Fe–O bond lengths are 2.02 Å. B is bonded in a trigonal planar geometry to three equivalent O atoms. All B–O bond lengths are 1.38 Å. S is bonded in a tetrahedral geometry to four equivalent O atoms. All S–O bond lengths are 1.50 Å. There are two inequivalent O sites. In the first O site, O is bonded to three equivalent Na and one S atom to form distorted edge-sharing ONa3S trigonal pyramids. In the second O site, O is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na, one Fe, and one B atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3FeBSO7 by Materials Project

Na3FeBSO7 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.34–2.87 Å. In the second Na1+ site, Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.25–3.01 Å. Fe2+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four equivalent SO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 2.08–2.32 Å. B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.36 Å) and two longer (1.41 Å) B–O bond length. S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with four equivalent FeO6 octahedra. The corner-sharing octahedra tilt angles range from 36–54°. There is one shorter (1.49 Å) and three longer (1.50 Å) S–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one B3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal bipyramidal geometry to three Na1+, one Fe2+, and one B3+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+, one Fe2+, and one B3+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Fe2+, and one S6+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+, one Fe2+, and one S6+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+, one Fe2+, and one S6+ atom.

36 MATERIALS SCIENCE↗