Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Fe-Li-S”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

10 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Li14Fe2S9 by Materials Project

Li14Fe2S9 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are fourteen inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share a cornercorner with one FeS4 tetrahedra, corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.46–2.54 Å. In the second Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with twelve LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.46–2.51 Å. In the third Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with twelve LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.47–2.50 Å. In the fourth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with three equivalent FeS4 tetrahedra, corners with ten LiS4 tetrahedra, and edges with six LiS4 tetrahedra. There are two shorter (2.46 Å) and two longer (2.47 Å) Li–S bond lengths. In the fifth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with three equivalent FeS4 tetrahedra, corners with ten LiS4 tetrahedra, and edges with six LiS4 tetrahedra. There are one shorter (2.46 Å) and three longer (2.47 Å) Li–S bond lengths. In the sixth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share a cornercorner with one FeS4 tetrahedra, corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.46–2.54 Å. In the seventh Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share a cornercorner with one FeS4 tetrahedra, corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.47–2.55 Å. In the eighth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with twelve LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.44–2.51 Å. In the ninth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with twelve LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.45–2.50 Å. In the tenth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share a cornercorner with one FeS4 tetrahedra, corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.47–2.56 Å. In the eleventh Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share a cornercorner with one FeS4 tetrahedra, corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.47–2.55 Å. In the twelfth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with twelve LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.46–2.50 Å. In the thirteenth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with twelve LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.46–2.50 Å. In the fourteenth Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share a cornercorner with one FeS4 tetrahedra, corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with four LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.47–2.54 Å. There are two inequivalent Fe2+ sites. In the first Fe2+ site, Fe2+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with twelve LiS4 tetrahedra and edges with six LiS4 tetrahedra. There are one shorter (2.34 Å) and three longer (2.35 Å) Fe–S bond lengths. In the second Fe2+ site, Fe2+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with twelve LiS4 tetrahedra and edges with six LiS4 tetrahedra. There are one shorter (2.34 Å) and three longer (2.35 Å) Fe–S bond lengths. There are nine inequivalent S2- sites. In the first S2- site, S2- is bonded to six Li1+ and one Fe2+ atom to form a mixture of distorted edge and corner-sharing SLi6Fe hexagonal pyramids. In the second S2- site, S2- is bonded to six Li1+ and one Fe2+ atom to form a mixture of distorted edge and corner-sharing SLi6Fe hexagonal pyramids. In the third S2- site, S2- is bonded in a 7-coordinate geometry to six Li1+ and one Fe2+ atom. In the fourth S2- site, S2- is bonded in a body-centered cubic geometry to eight Li1+ atoms. In the fifth S2- site, S2- is bonded to six Li1+ and one Fe2+ atom to form a mixture of distorted edge and corner-sharing SLi6Fe hexagonal pyramids. In the sixth S2- site, S2- is bonded to six Li1+ and one Fe2+ atom to form a mixture of distorted edge and corner-sharing SLi6Fe hexagonal pyramids. In the seventh S2- site, S2- is bonded in a 7-coordinate geometry to six Li1+ and one Fe2+ atom. In the eighth S2- site, S2- is bonded to six Li1+ and one Fe2+ atom to form a mixture of distorted edge and corner-sharing SLi6Fe hexagonal pyramids. In the ninth S2- site, S2- is bonded to six Li1+ and one Fe2+ atom to form a mixture of distorted edge and corner-sharing SLi6Fe hexagonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2FeS2 by Materials Project

Li2FeS2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with six equivalent LiS6 octahedra, corners with six equivalent LiS4 tetrahedra, edges with three equivalent LiS6 octahedra, and edges with three equivalent FeS4 tetrahedra. The corner-sharing octahedra tilt angles range from 16–53°. There are three shorter (2.33 Å) and one longer (2.49 Å) Li–S bond lengths. In the second Li1+ site, Li1+ is bonded to six S2- atoms to form LiS6 octahedra that share corners with six equivalent LiS4 tetrahedra, corners with six equivalent FeS4 tetrahedra, edges with six equivalent LiS6 octahedra, edges with three equivalent LiS4 tetrahedra, and edges with three equivalent FeS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.62–2.93 Å. Fe2+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with six equivalent LiS6 octahedra, corners with six equivalent FeS4 tetrahedra, edges with three equivalent LiS6 octahedra, and edges with three equivalent LiS4 tetrahedra. The corner-sharing octahedra tilt angles range from 18–59°. There are a spread of Fe–S bond distances ranging from 2.34–2.38 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to four Li1+ and three equivalent Fe2+ atoms to form distorted edge-sharing SLi4Fe3 pentagonal bipyramids. In the second S2- site, S2- is bonded in a 7-coordinate geometry to six Li1+ and one Fe2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li3(Fe2S3)2 by Materials Project

Li3(Fe2S3)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to six S2- atoms to form LiS6 octahedra that share corners with eight equivalent FeS4 tetrahedra, edges with six equivalent LiS6 octahedra, and edges with four equivalent FeS4 tetrahedra. There are two shorter (2.51 Å) and four longer (2.71 Å) Li–S bond lengths. In the second Li1+ site, Li1+ is bonded to six S2- atoms to form LiS6 octahedra that share corners with eight equivalent FeS4 tetrahedra, edges with six LiS6 octahedra, and edges with four equivalent FeS4 tetrahedra. There are two shorter (2.52 Å) and four longer (2.74 Å) Li–S bond lengths. Fe+2.25+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with six LiS6 octahedra, corners with three equivalent FeS4 tetrahedra, edges with three LiS6 octahedra, and edges with two equivalent FeS4 tetrahedra. The corner-sharing octahedra tilt angles range from 14–57°. There are a spread of Fe–S bond distances ranging from 2.21–2.27 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to three Li1+ and two equivalent Fe+2.25+ atoms to form SLi3Fe2 square pyramids that share corners with six equivalent SLi3Fe3 octahedra, a cornercorner with one SLi3Fe2 square pyramid, edges with six equivalent SLi3Fe3 octahedra, and an edgeedge with one SLi3Fe2 square pyramid. The corner-sharing octahedra tilt angles range from 7–84°. In the second S2- site, S2- is bonded to three Li1+ and three equivalent Fe+2.25+ atoms to form distorted SLi3Fe3 octahedra that share corners with three equivalent SLi3Fe3 octahedra, corners with three equivalent SLi3Fe2 square pyramids, edges with six equivalent SLi3Fe3 octahedra, and edges with three equivalent SLi3Fe2 square pyramids. The corner-sharing octahedra tilt angles range from 0–88°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2FeS2 by Materials Project

Li2FeS2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Li1+ is bonded to four equivalent S2- atoms to form LiS4 tetrahedra that share corners with six equivalent FeS6 octahedra, corners with six equivalent LiS4 tetrahedra, edges with three equivalent FeS6 octahedra, and edges with three equivalent LiS4 tetrahedra. The corner-sharing octahedra tilt angles range from 11–58°. There are three shorter (2.35 Å) and one longer (2.54 Å) Li–S bond lengths. Fe2+ is bonded to six equivalent S2- atoms to form FeS6 octahedra that share corners with twelve equivalent LiS4 tetrahedra, edges with six equivalent FeS6 octahedra, and edges with six equivalent LiS4 tetrahedra. All Fe–S bond lengths are 2.59 Å. S2- is bonded in a 7-coordinate geometry to four equivalent Li1+ and three equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2Fe2S3 by Materials Project

Li2Fe2S3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Li1+ is bonded to four S2- atoms to form LiS4 trigonal pyramids that share corners with six equivalent FeS4 tetrahedra, corners with six equivalent LiS4 trigonal pyramids, edges with two equivalent FeS4 tetrahedra, and an edgeedge with one LiS4 trigonal pyramid. There are a spread of Li–S bond distances ranging from 2.47–2.62 Å. Fe2+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with five equivalent FeS4 tetrahedra, corners with six equivalent LiS4 trigonal pyramids, an edgeedge with one FeS4 tetrahedra, and edges with two equivalent LiS4 trigonal pyramids. There are a spread of Fe–S bond distances ranging from 2.31–2.37 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to four equivalent Li1+ and two equivalent Fe2+ atoms to form corner-sharing SLi4Fe2 octahedra. The corner-sharing octahedral tilt angles are 44°. In the second S2- site, S2- is bonded in a distorted pentagonal planar geometry to two equivalent Li1+ and three equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2Fe2S3 by Materials Project

Li2Fe2S3 is Aluminum carbonitride-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Li1+ is bonded in a distorted see-saw-like geometry to four S2- atoms. There are a spread of Li–S bond distances ranging from 2.42–2.59 Å. Fe2+ is bonded to four S2- atoms to form a mixture of distorted edge and corner-sharing FeS4 tetrahedra. There are a spread of Fe–S bond distances ranging from 2.30–2.42 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to two equivalent Li1+ and four equivalent Fe2+ atoms to form SLi2Fe4 octahedra that share corners with four equivalent SLi2Fe4 octahedra, corners with six equivalent SLi3Fe2 square pyramids, and edges with four equivalent SLi3Fe2 square pyramids. The corner-sharing octahedral tilt angles are 49°. In the second S2- site, S2- is bonded to three equivalent Li1+ and two equivalent Fe2+ atoms to form distorted SLi3Fe2 square pyramids that share corners with three equivalent SLi2Fe4 octahedra, corners with four equivalent SLi3Fe2 square pyramids, edges with two equivalent SLi2Fe4 octahedra, and edges with two equivalent SLi3Fe2 square pyramids. The corner-sharing octahedra tilt angles range from 44–75°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li3(FeS2)2 by Materials Project

Li3Fe2S4 is Aluminum carbonitride-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to five S2- atoms to form distorted LiS5 trigonal bipyramids that share corners with six equivalent FeS4 tetrahedra, corners with two equivalent LiS5 trigonal bipyramids, corners with four equivalent LiS4 trigonal pyramids, edges with two equivalent FeS4 tetrahedra, and edges with two equivalent LiS4 trigonal pyramids. There are a spread of Li–S bond distances ranging from 2.45–3.01 Å. In the second Li1+ site, Li1+ is bonded to four S2- atoms to form distorted LiS4 trigonal pyramids that share corners with six equivalent FeS4 tetrahedra, corners with two equivalent LiS5 trigonal bipyramids, corners with five equivalent LiS4 trigonal pyramids, an edgeedge with one FeS4 tetrahedra, an edgeedge with one LiS5 trigonal bipyramid, and an edgeedge with one LiS4 trigonal pyramid. There are a spread of Li–S bond distances ranging from 2.46–2.64 Å. Fe+2.50+ is bonded to four S2- atoms to form FeS4 tetrahedra that share corners with three equivalent LiS5 trigonal bipyramids, corners with six equivalent LiS4 trigonal pyramids, edges with two equivalent FeS4 tetrahedra, an edgeedge with one LiS5 trigonal bipyramid, and an edgeedge with one LiS4 trigonal pyramid. There are a spread of Fe–S bond distances ranging from 2.24–2.29 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li1+ and two equivalent Fe+2.50+ atoms. In the second S2- site, S2- is bonded in a distorted pentagonal planar geometry to three Li1+ and two equivalent Fe+2.50+ atoms. In the third S2- site, S2- is bonded in a 6-coordinate geometry to four Li1+ and two equivalent Fe+2.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li8FeS6 by Materials Project

Li8FeS6 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are ten inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with ten LiS4 tetrahedra, and edges with five LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.43–2.50 Å. In the second Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with three LiS4 tetrahedra. There are three shorter (2.45 Å) and one longer (2.59 Å) Li–S bond lengths. In the third Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with three LiS4 tetrahedra. There are three shorter (2.45 Å) and one longer (2.59 Å) Li–S bond lengths. In the fourth Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with ten LiS4 tetrahedra, and edges with five LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.44–2.50 Å. In the fifth Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with three equivalent FeS4 tetrahedra, corners with nine LiS4 tetrahedra, and edges with three LiS4 tetrahedra. There are three shorter (2.46 Å) and one longer (2.47 Å) Li–S bond lengths. In the sixth Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with three equivalent FeS4 tetrahedra, corners with nine LiS4 tetrahedra, and edges with three LiS4 tetrahedra. There are one shorter (2.46 Å) and three longer (2.47 Å) Li–S bond lengths. In the seventh Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with ten LiS4 tetrahedra, and edges with five LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.44–2.50 Å. In the eighth Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with three LiS4 tetrahedra. There are three shorter (2.45 Å) and one longer (2.59 Å) Li–S bond lengths. In the ninth Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with fourteen LiS4 tetrahedra, an edgeedge with one FeS4 tetrahedra, and edges with three LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.45–2.59 Å. In the tenth Li1+ site, Li1+ is bonded to four S+1.83- atoms to form LiS4 tetrahedra that share corners with two FeS4 tetrahedra, corners with ten LiS4 tetrahedra, and edges with five LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.43–2.50 Å. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to four S+1.83- atoms to form FeS4 tetrahedra that share corners with twelve LiS4 tetrahedra and edges with three LiS4 tetrahedra. There are three shorter (2.19 Å) and one longer (2.28 Å) Fe–S bond lengths. In the second Fe3+ site, Fe3+ is bonded to four S+1.83- atoms to form FeS4 tetrahedra that share corners with twelve LiS4 tetrahedra and edges with three LiS4 tetrahedra. There are a spread of Fe–S bond distances ranging from 2.19–2.27 Å. There are eight inequivalent S+1.83- sites. In the first S+1.83- site, S+1.83- is bonded to four Li1+ and one Fe3+ atom to form corner-sharing SLi4Fe trigonal bipyramids. In the second S+1.83- site, S+1.83- is bonded to four Li1+ and one Fe3+ atom to form corner-sharing SLi4Fe trigonal bipyramids. In the third S+1.83- site, S+1.83- is bonded in a 7-coordinate geometry to seven Li1+ atoms. In the fourth S+1.83- site, S+1.83- is bonded in a 7-coordinate geometry to six Li1+ and one Fe3+ atom. In the fifth S+1.83- site, S+1.83- is bonded in a 7-coordinate geometry to six Li1+ and one Fe3+ atom. In the sixth S+1.83- site, S+1.83- is bonded in a 7-coordinate geometry to seven Li1+ atoms. In the seventh S+1.83- site, S+1.83- is bonded to four Li1+ and one Fe3+ atom to form corner-sharing SLi4Fe trigonal bipyramids. In the eighth S+1.83- site, S+1.83- is bonded to four Li1+ and one Fe3+ atom to form corner-sharing SLi4Fe trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li6FeS4 by Materials Project

Li6FeS4 crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. there are three inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a 5-coordinate geometry to five S2- atoms. There are a spread of Li–S bond distances ranging from 2.44–2.94 Å. In the second Li1+ site, Li1+ is bonded to five S2- atoms to form distorted LiS5 square pyramids that share corners with six equivalent LiS5 square pyramids, corners with three equivalent LiS4 tetrahedra, edges with three equivalent LiS5 square pyramids, and edges with three equivalent LiS4 tetrahedra. There are a spread of Li–S bond distances ranging from 2.50–2.72 Å. In the third Li1+ site, Li1+ is bonded to four S2- atoms to form LiS4 tetrahedra that share corners with three equivalent LiS5 square pyramids, corners with seven equivalent LiS4 tetrahedra, and edges with three equivalent LiS5 square pyramids. There are a spread of Li–S bond distances ranging from 2.33–2.40 Å. Fe2+ is bonded in a distorted trigonal planar geometry to five S2- atoms. There are a spread of Fe–S bond distances ranging from 2.18–2.99 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded to six Li1+ and one Fe2+ atom to form distorted edge-sharing SLi6Fe pentagonal bipyramids. In the second S2- site, S2- is bonded in a 9-coordinate geometry to eight Li1+ and one Fe2+ atom. In the third S2- site, S2- is bonded in a 4-coordinate geometry to six Li1+ and two equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li2FeS2 by Materials Project

Li2FeS2 crystallizes in the orthorhombic Ibam space group. The structure is three-dimensional. Li1+ is bonded to five equivalent S2- atoms to form distorted LiS5 trigonal bipyramids that share corners with six equivalent FeS4 tetrahedra, corners with six equivalent LiS5 trigonal bipyramids, edges with two equivalent FeS4 tetrahedra, and edges with seven equivalent LiS5 trigonal bipyramids. There are a spread of Li–S bond distances ranging from 2.50–2.66 Å. Fe2+ is bonded to four equivalent S2- atoms to form FeS4 tetrahedra that share corners with twelve equivalent LiS5 trigonal bipyramids, edges with two equivalent FeS4 tetrahedra, and edges with four equivalent LiS5 trigonal bipyramids. All Fe–S bond lengths are 2.17 Å. S2- is bonded to five equivalent Li1+ and two equivalent Fe2+ atoms to form a mixture of distorted edge, face, and corner-sharing SLi5Fe2 pentagonal bipyramids.

36 MATERIALS SCIENCE↗