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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba(FeS2)2 by Materials Project

BaFe2S4 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Ba2+ is bonded to twelve equivalent S2- atoms to form BaS12 cuboctahedra that share corners with eight equivalent FeS4 tetrahedra, edges with eight equivalent BaS12 cuboctahedra, edges with eight equivalent FeS4 tetrahedra, and faces with two equivalent BaS12 cuboctahedra. There are four shorter (3.30 Å) and eight longer (3.57 Å) Ba–S bond lengths. Fe3+ is bonded to four equivalent S2- atoms to form FeS4 tetrahedra that share corners with four equivalent BaS12 cuboctahedra, edges with four equivalent BaS12 cuboctahedra, and edges with two equivalent FeS4 tetrahedra. All Fe–S bond lengths are 2.14 Å. S2- is bonded in a 2-coordinate geometry to three equivalent Ba2+ and two equivalent Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(FeS2)2 by Materials Project

BaFe2S4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Ba2+ is bonded in a 12-coordinate geometry to twelve S2- atoms. There are a spread of Ba–S bond distances ranging from 3.30–3.88 Å. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to four S2- atoms to form edge-sharing FeS4 tetrahedra. There are two shorter (2.13 Å) and two longer (2.14 Å) Fe–S bond lengths. In the second Fe3+ site, Fe3+ is bonded to four S2- atoms to form edge-sharing FeS4 tetrahedra. There are one shorter (2.13 Å) and three longer (2.14 Å) Fe–S bond lengths. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to three equivalent Ba2+ and two Fe3+ atoms. In the second S2- site, S2- is bonded in a 4-coordinate geometry to three equivalent Ba2+ and two Fe3+ atoms. In the third S2- site, S2- is bonded in a 4-coordinate geometry to three equivalent Ba2+ and two Fe3+ atoms. In the fourth S2- site, S2- is bonded in a 4-coordinate geometry to three equivalent Ba2+ and two Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(FeS2)2 by Materials Project

BaFe2S4 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are four shorter (3.25 Å) and four longer (3.27 Å) Ba–S bond lengths. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to four S2- atoms to form edge-sharing FeS4 tetrahedra. There are two shorter (2.14 Å) and two longer (2.15 Å) Fe–S bond lengths. In the second Fe3+ site, Fe3+ is bonded to four S2- atoms to form edge-sharing FeS4 tetrahedra. All Fe–S bond lengths are 2.15 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to two equivalent Ba2+ and two Fe3+ atoms. In the second S2- site, S2- is bonded in a 4-coordinate geometry to two equivalent Ba2+ and two Fe3+ atoms.

36 MATERIALS SCIENCE↗