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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RbFeS2 by Materials Project

RbFeS2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Rb1+ is bonded to eight equivalent S2- atoms to form distorted RbS8 hexagonal bipyramids that share corners with four equivalent RbS8 hexagonal bipyramids, corners with six equivalent FeS4 tetrahedra, edges with six equivalent RbS8 hexagonal bipyramids, edges with five equivalent FeS4 tetrahedra, and faces with two equivalent RbS8 hexagonal bipyramids. There are a spread of Rb–S bond distances ranging from 3.49–3.57 Å. Fe3+ is bonded to four equivalent S2- atoms to form FeS4 tetrahedra that share corners with six equivalent RbS8 hexagonal bipyramids, edges with five equivalent RbS8 hexagonal bipyramids, and edges with two equivalent FeS4 tetrahedra. There are two shorter (2.18 Å) and two longer (2.19 Å) Fe–S bond lengths. S2- is bonded in a 2-coordinate geometry to four equivalent Rb1+ and two equivalent Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb3(FeS2)2 by Materials Project

Rb3Fe2S4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of Rb–S bond distances ranging from 3.27–3.94 Å. In the second Rb1+ site, Rb1+ is bonded to six S2- atoms to form distorted RbS6 octahedra that share corners with eight equivalent FeS4 tetrahedra, edges with two equivalent FeS4 tetrahedra, and faces with two equivalent RbS6 octahedra. There are a spread of Rb–S bond distances ranging from 3.25–3.46 Å. Fe+2.50+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with four equivalent RbS6 octahedra, an edgeedge with one RbS6 octahedra, and edges with two equivalent FeS4 tetrahedra. The corner-sharing octahedra tilt angles range from 21–64°. There are a spread of Fe–S bond distances ranging from 2.26–2.32 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a 6-coordinate geometry to four equivalent Rb1+ and two equivalent Fe+2.50+ atoms. In the second S2- site, S2- is bonded in a 7-coordinate geometry to five Rb1+ and two equivalent Fe+2.50+ atoms. In the third S2- site, S2- is bonded in a 6-coordinate geometry to six Rb1+ and two equivalent Fe+2.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbFeS2 by Materials Project

RbFeS2 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Rb1+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Rb–S bond distances ranging from 3.38–3.77 Å. Fe3+ is bonded to four S2- atoms to form edge-sharing FeS4 tetrahedra. There are two shorter (2.18 Å) and two longer (2.19 Å) Fe–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to four equivalent Rb1+ and two equivalent Fe3+ atoms to form a mixture of distorted corner and edge-sharing SRb4Fe2 octahedra. The corner-sharing octahedra tilt angles range from 11–75°. In the second S2- site, S2- is bonded in a 2-coordinate geometry to four equivalent Rb1+ and two equivalent Fe3+ atoms.

36 MATERIALS SCIENCE↗