Search NASA⌕ Search

SEARCH · Search NASA

Results for “hexagonal geometry”

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.

At least 343 records · Page 19

Materials Data on Dy5(CoSn3)6 by Materials Project

Dy5(CoSn3)6 crystallizes in the tetragonal I4_1/acd space group. The structure is three-dimensional. there are two inequivalent Dy sites. In the first Dy site, Dy is bonded in a 12-coordinate geometry to six Co and twelve Sn atoms. There are two shorter (3.45 Å) and four longer (3.49 Å) Dy–Co bond lengths. There are a spread of Dy–Sn bond distances ranging from 3.32–3.38 Å. In the second Dy site, Dy is bonded in a 1-coordinate geometry to three Co and ten Sn atoms. There are two shorter (3.00 Å) and one longer (3.08 Å) Dy–Co bond lengths. There are a spread of Dy–Sn bond distances ranging from 3.11–3.32 Å. There are two inequivalent Co sites. In the first Co site, Co is bonded in a 9-coordinate geometry to three Dy and six Sn atoms. There are a spread of Co–Sn bond distances ranging from 2.61–2.78 Å. In the second Co site, Co is bonded in a 9-coordinate geometry to three Dy and six Sn atoms. There are a spread of Co–Sn bond distances ranging from 2.58–2.77 Å. There are six inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to three Dy, two equivalent Co, and one Sn atom. The Sn–Sn bond length is 2.99 Å. In the second Sn site, Sn is bonded in a 2-coordinate geometry to three Dy and two Co atoms. In the third Sn site, Sn is bonded in a 6-coordinate geometry to three Dy, two equivalent Co, and one Sn atom. In the fourth Sn site, Sn is bonded in a distorted hexagonal planar geometry to three equivalent Dy and three Co atoms. In the fifth Sn site, Sn is bonded in a 6-coordinate geometry to three Dy, two Co, and one Sn atom. The Sn–Sn bond length is 3.00 Å. In the sixth Sn site, Sn is bonded in a distorted L-shaped geometry to two equivalent Dy atoms.

36 MATERIALS SCIENCE↗

Materials Data on Ni3(PbS)2 by Materials Project

Ni3Pb2S2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ni is bonded in a distorted linear geometry to four Pb and two equivalent S atoms. There are two shorter (2.82 Å) and two longer (2.84 Å) Ni–Pb bond lengths. Both Ni–S bond lengths are 2.18 Å. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded in a hexagonal planar geometry to six equivalent Ni atoms. In the second Pb site, Pb is bonded to six equivalent Ni and two equivalent S atoms to form corner-sharing PbNi6S2 hexagonal bipyramids. Both Pb–S bond lengths are 3.16 Å. S is bonded in a 3-coordinate geometry to three equivalent Ni and one Pb atom.

36 MATERIALS SCIENCE↗

Materials Data on Ni3(PbSe)2 by Materials Project

Ni3(PbSe)2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ni is bonded in a 2-coordinate geometry to four Pb and two equivalent Se atoms. There are two shorter (2.86 Å) and two longer (2.93 Å) Ni–Pb bond lengths. Both Ni–Se bond lengths are 2.30 Å. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded in a distorted hexagonal planar geometry to six equivalent Ni atoms. In the second Pb site, Pb is bonded to six equivalent Ni and two equivalent Se atoms to form corner-sharing PbNi6Se2 hexagonal bipyramids. Both Pb–Se bond lengths are 3.24 Å. Se is bonded in a 3-coordinate geometry to three equivalent Ni and one Pb atom.

36 MATERIALS SCIENCE↗

Materials Data on Tl2Ni3S2 by Materials Project

Tl2Ni3S2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ni is bonded in a distorted linear geometry to four Tl and two equivalent S atoms. There are two shorter (2.77 Å) and two longer (2.81 Å) Ni–Tl bond lengths. Both Ni–S bond lengths are 2.17 Å. There are two inequivalent Tl sites. In the first Tl site, Tl is bonded in a distorted hexagonal planar geometry to six equivalent Ni atoms. In the second Tl site, Tl is bonded to six equivalent Ni and two equivalent S atoms to form corner-sharing TlNi6S2 hexagonal bipyramids. Both Tl–S bond lengths are 3.16 Å. S is bonded in a 3-coordinate geometry to three equivalent Ni and one Tl atom.

36 MATERIALS SCIENCE↗

A phase width for CaGaSn. Crystal structure of mixed intermetallic Ca{sub 4}Ga{sub 4+x}Sn{sub 4−x} and SmGa{sub x}Sn{sub 3−x}, stability, geometry and electronic structure

X-ray single-crystal structure has been established for new compositions in intermetallic systems of tin and gallium. Crystals were successfully obtained in alloys prepared from elements. The structure of SmGaSn{sub 2} (cubic Pm3̄m, a=4.5778(8) Å, Z=1, R1=0.012) is described with atomic disorder at all Sn/Ga positions and the structure of Ca{sub 4}Ga{sub 4.9}Sn{sub 3.1} (hexagonal, P6{sub 3}/mmc, a=4.2233(9), c=17.601(7) Å, Z=1, R1=0.062) raises an interesting question about existence of a composition domain for CaGaSn. Finally, Ca{sub 4}Ga{sub 4.9}Sn{sub 3.1} should be considered as a particular composition of Ca{sub 4}Ga{sub 4+x}Sn{sub 4−x}, a compound assumed to exist in the range x ~ 0−1. Partial atomic ordering characterizes the Sn/Ga puckered layers of hexagons whose geometries are analyzed and discussed comparatively with analogous arrangements in AlB{sub 2} related hexagonal compounds. The study is supported by rigid band model and DFT calculations performed for different experimental and hypothetic arrangements. - Graphical abstract: A phase width for Ca{sub 4}Ga{sub 4+x}Sn{sub 4−x} belonging to the hexagonal YPtAs structure-type. - Highlights: • Single crystals of mixed tin gallium ternary intermetallics were obtained. • Partial ordering at metal sites and phase width are evidenced for Ca{sub 4}Ga{sub 4+x}Sn{sub 4−x}. • Layer deviation to flatness is studied comparatively with related structures. • Geometry and stability analyses based on DFT calculations are provided.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗

Materials Data on CaSnS3 by Materials Project

CaSnS3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eighteen inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of Ca–S bond distances ranging from 2.72–3.34 Å. In the second Ca2+ site, Ca2+ is bonded to eight S2- atoms to form distorted CaS8 hexagonal bipyramids that share a cornercorner with one CaS6 octahedra, a cornercorner with one CaS5 trigonal bipyramid, edges with four CaS7 pentagonal bipyramids, an edgeedge with one SnS4 tetrahedra, and a faceface with one SnS4 trigonal pyramid. The corner-sharing octahedral tilt angles are 21°. There are a spread of Ca–S bond distances ranging from 2.78–3.46 Å. In the third Ca2+ site, Ca2+ is bonded to six S2- atoms to form distorted CaS6 octahedra that share corners with three CaS7 pentagonal bipyramids, a cornercorner with one SnS5 trigonal bipyramid, corners with two SnS4 trigonal pyramids, and edges with two CaS6 octahedra. There are a spread of Ca–S bond distances ranging from 2.77–3.21 Å. In the fourth Ca2+ site, Ca2+ is bonded to seven S2- atoms to form CaS7 pentagonal bipyramids that share a cornercorner with one CaS6 octahedra, corners with two SnS4 tetrahedra, a cornercorner with one SnS4 trigonal pyramid, an edgeedge with one CaS8 hexagonal bipyramid, an edgeedge with one CaS6 octahedra, edges with three CaS7 pentagonal bipyramids, and an edgeedge with one SnS5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 19°. There are a spread of Ca–S bond distances ranging from 2.83–3.11 Å. In the fifth Ca2+ site, Ca2+ is bonded in a distorted hexagonal planar geometry to six S2- atoms. There are a spread of Ca–S bond distances ranging from 2.74–2.86 Å. In the sixth Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six S2- atoms. There are a spread of Ca–S bond distances ranging from 2.80–3.20 Å. In the seventh Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six S2- atoms. There are a spread of Ca–S bond distances ranging from 2.73–3.31 Å. In the eighth Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of Ca–S bond distances ranging from 2.78–3.23 Å. In the ninth Ca2+ site, Ca2+ is bonded to seven S2- atoms to form distorted CaS7 pentagonal bipyramids that share a cornercorner with one SnS6 octahedra, a cornercorner with one SnS4 tetrahedra, a cornercorner with one SnS4 trigonal pyramid, edges with two CaS6 octahedra, edges with two CaS7 pentagonal bipyramids, and an edgeedge with one SnS5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 43°. There are a spread of Ca–S bond distances ranging from 2.73–3.38 Å. In the tenth Ca2+ site, Ca2+ is bonded to six S2- atoms to form distorted CaS6 octahedra that share a cornercorner with one CaS8 hexagonal bipyramid, a cornercorner with one SnS4 tetrahedra, a cornercorner with one SnS4 trigonal pyramid, an edgeedge with one CaS6 octahedra, edges with two CaS7 pentagonal bipyramids, and an edgeedge with one SnS4 trigonal pyramid. There are a spread of Ca–S bond distances ranging from 2.71–2.88 Å. In the eleventh Ca2+ site, Ca2+ is bonded to seven S2- atoms to form distorted CaS7 pentagonal bipyramids that share a cornercorner with one CaS6 octahedra, an edgeedge with one SnS6 octahedra, an edgeedge with one CaS7 pentagonal bipyramid, an edgeedge with one SnS4 tetrahedra, and an edgeedge with one SnS4 trigonal pyramid. The corner-sharing octahedral tilt angles are 58°. There are a spread of Ca–S bond distances ranging from 2.79–3.07 Å. In the twelfth Ca2+ site, Ca2+ is bonded to seven S2- atoms to form distorted CaS7 pentagonal bipyramids that share a cornercorner with one SnS4 tetrahedra, a cornercorner with one SnS5 trigonal bipyramid, an edgeedge with one CaS8 hexagonal bipyramid, and an edgeedge with one CaS5 trigonal bipyramid. There are a spread of Ca–S bond distances ranging from 2.85–3.08 Å. In the thirteenth Ca2+ site, Ca2+ is bonded to five S2- atoms to form distorted CaS5 trigonal bipyramids that share a cornercorner with one CaS7 pentagonal bipyramid, a cornercorner with one SnS4 tetrahedra, a cornercorner with one SnS5 trigonal bipyramid, and an edgeedge with one SnS6 octahedra. There are a spread of Ca–S bond distances ranging from 2.68–3.03 Å. In the fourteenth Ca2+ site, Ca2+ is bonded to seven S2- atoms to form distorted CaS7 pentagonal bipyramids that share a cornercorner with one SnS4 tetrahedra, a cornercorner with one SnS5 trigonal bipyramid, a cornercorner with one SnS4 trigonal pyramid, an edgeedge with one CaS8 hexagonal bipyramid, and edges with two CaS7 pentagonal bipyramids. There are a spread of Ca–S bond distances ranging from 2.78–2.86 Å. In the fifteenth Ca2+ site, Ca2+ is bonded to six S2- atoms to form distorted CaS6 octahedra that share a cornercorner with one SnS6 octahedra, corners with two SnS4 tetrahedra, a cornercorner with one CaS5 trigonal bipyramid, a cornercorner with one SnS5 trigonal bipyramid, an edgeedge with one CaS6 octahedra, and edges with two CaS7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 44°. There are a spread of Ca–S bond distances ranging from 2.78–3.16 Å. In the sixteenth Ca2+ site, Ca2+ is bonded to seven S2- atoms to form distorted CaS7 pentagonal bipyramids that share a cornercorner with one CaS6 octahedra, a cornercorner with one SnS4 tetrahedra, a cornercorner with one CaS5 trigonal bipyramid, corners with two SnS5 trigonal bipyramids, a cornercorner with one SnS4 trigonal pyramid, an edgeedge with one CaS8 hexagonal bipyramid, an edgeedge with one CaS6 octahedra, and edges with two CaS7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 71°. There are a spread of Ca–S bond distances ranging from 2.79–3.14 Å. In the seventeenth Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to six S2- atoms. There are a spread of Ca–S bond distances ranging from 2.75–3.19 Å. In the eighteenth Ca2+ site, Ca2+ is bonded to five S2- atoms to form distorted CaS5 trigonal bipyramids that share a cornercorner with one CaS8 hexagonal bipyramid, a cornercorner with one CaS6 octahedra, a cornercorner with one SnS6 octahedra, a cornercorner with one SnS4 tetrahedra, a cornercorner with one SnS5 trigonal bipyramid, and an edgeedge with one CaS7 pentagonal bipyramid. The corner-sharing octahedra tilt angles range from 62–76°. There are a spread of Ca–S bond distances ranging from 2.82–2.96 Å. There are eighteen inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded in a distorted T-shaped geometry to three S2- atoms. There are two shorter (2.52 Å) and one longer (2.59 Å) Sn–S bond lengths. In the second Sn4+ site, Sn4+ is bonded to four S2- atoms to form distorted SnS4 tetrahedra that share corners with two CaS6 octahedra, corners with three CaS7 pentagonal bipyramids, a cornercorner with one SnS5 trigonal bipyramid, and a cornercorner with one SnS4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 33–64°. There are a spread of Sn–S bond distances ranging from 2.40–2.62 Å. In the third Sn4+ site, Sn4+ is bonded to six S2- atoms to form distorted SnS6 octahedra that share a cornercorner with one CaS6 octahedra, a cornercorner with one CaS7 pentagonal bipyramid, a cornercorner with one SnS4 tetrahedra, a cornercorner with one CaS5 trigonal bipyramid, an edgeedge with one CaS7 pentagonal bipyramid, and an edgeedge with one CaS5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 44°. There are a spread of Sn–S bond distances ranging from 2.54–2.84 Å. In the fourth Sn4+ site, Sn4+ is bonded to five S2- atoms to form SnS5 trigonal bipyramids that share corners with two CaS7 pentagonal bipyramids and corners with two CaS5 trigonal bipyramids. There are a spread of Sn–S bond distances ranging from 2.48–2.67 Å. In the fifth Sn4+ site, Sn4+ is bonded in a distorted T-shaped geometry to three S2- atoms. There are a spread of Sn–S bond distances ranging from 2.59–2.74 Å. In the sixth Sn4+ site, Sn4+ is bonded to four S2- atoms to form SnS4 tetrahedra that share a cornercorner with one CaS6 octahedra, a cornercorner with one CaS7 pentagonal bipyramid, a cornercorner with one CaS5 trigonal bipyramid, a cornercorner with one SnS4 trigonal pyramid, and an edgeedge with one CaS7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 50°. There are a spread of Sn–S bond distances ranging from 2.42–2.51 Å. In the seventh Sn4+ site, Sn4+ is bonded in a distorted T-shaped geometry to three S2- atoms. There are two shorter (2.61 Å) and one longer (2.68 Å) Sn–S bond lengths. In the eighth Sn4+ site, Sn4+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are a spread of Sn–S bond distances ranging from 2.60–2.67 Å. In the ninth Sn4+ site, Sn4+ is bonded in a distorted trigonal non-coplanar geometry to three S2- atoms. There are a spread of Sn–S bond distances ranging from 2.57–2.85 Å. In the tenth Sn4+ site, Sn4+ is bonded in a water-like geometry to two S2- atoms. There are one shorter (2.50 Å) and one longer (2.68 Å) Sn–S bond lengths. In the eleventh Sn4+ site, Sn4+ is bonded to four S2- atoms to form SnS4 trigonal pyramids that share corners with two CaS6 octahedra, a cornercorner with one CaS7 pentagonal bipyramid, corners with two SnS4 tetrahedra, a cornercorner with one SnS4 trigonal pyramid, and an edgeedge with one CaS7 pentagonal bipyramid. The corner-sharing octahedra tilt angles range from 23–77°. There are a spread of Sn–S bond distances ranging from 2.67–2.97 Å. In the twelfth Sn4+ site, Sn4+ is bonded in a distorted T-shaped geometry to three S2- atoms. There are a spread of Sn–S bond distances ranging from 2.45–2.65 Å. In the thirteenth Sn4+ site, Sn4+ is bonded in a distorted rectangular see-saw-like geometry to four S2- atoms. There are a spread of Sn–S bond distances ranging from 2.50–3.06 Å. In the fourteenth Sn4+ site, Sn4+ is bonded to four S2- atoms to form distorted SnS4 trigonal pyramids that share a cornercorner with one CaS6 octahedra, corners with three CaS7 pentagonal bipyramids, a cornercorner with one SnS4 trigonal pyramid, an edgeedge with one CaS6 octahedra, and a faceface with one CaS8 hexagonal bipyramid. The corner-sharing octahedral tilt angles are 70°. There are a spread of Sn–S bond distances ranging from 2.43–2.48 Å. In the fifteenth Sn4+ site, Sn4+ is bonded in a distorted see-saw-like geometry to four S2- atoms. There are a spread of Sn–S bond distances ranging from 2.39–2.60 Å. In the sixteenth Sn4+ site, Sn4+ is bonded to four S2- atoms to form SnS4 tetrahedra that share a cornercorner with one SnS6 octahedra, corners with two CaS7 pentagonal bipyramids, a cornercorner with one CaS5 trigonal bipyramid, and an edgeedge with one CaS8 hexagonal bipyramid. The corner-sharing octahedral tilt angles are 49°. There are a spread of Sn–S bond distances ranging from 2.38–2.51 Å. In the seventeenth Sn4+ site, Sn4+ is bonded to five S2- atoms to form SnS5 trigonal bipyramids that share corners with two CaS6 octahedra, corners with two CaS7 pentagonal bipyramids, a cornercorner with one SnS4 tetrahedra, and edges with two CaS7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 69–74°. There are a spread of Sn–S bond distances ranging from 2.46–2.85 Å. In the eighteenth Sn4+ site, Sn4+ is bonded in a distorted T-shaped geometry to three S2- atoms. There are a spread of Sn–S bond distances ranging from 2.50–2.75 Å. There are fifty-four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 2-coordinate geometry to two Ca2+ and one S2- atom. The S–S bond length is 2.06 Å. In the second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Sn4+ atom. In the third S2- site, S2- is bonded in a 4-coordinate geometry to three Ca2+, one Sn4+, and one S2- atom. The S–S b

36 MATERIALS SCIENCE↗

Materials Data on Nb3B2 by Materials Project

Nb3B2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are two inequivalent Nb2+ sites. In the first Nb2+ site, Nb2+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Nb–B bond lengths are 2.55 Å. In the second Nb2+ site, Nb2+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. There are four shorter (2.47 Å) and two longer (2.52 Å) Nb–B bond lengths. B3- is bonded in a 9-coordinate geometry to eight Nb2+ and one B3- atom. The B–B bond length is 1.86 Å.

36 MATERIALS SCIENCE↗

Materials Data on SiNiW by Materials Project

NiWSi crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are two inequivalent W2+ sites. In the first W2+ site, W2+ is bonded in a 7-coordinate geometry to seven Si4- atoms. There are a spread of W–Si bond distances ranging from 2.70–2.85 Å. In the second W2+ site, W2+ is bonded in a 5-coordinate geometry to five Si4- atoms. There are a spread of W–Si bond distances ranging from 2.68–2.79 Å. There are three inequivalent Ni2+ sites. In the first Ni2+ site, Ni2+ is bonded in a water-like geometry to two equivalent Si4- atoms. Both Ni–Si bond lengths are 2.26 Å. In the second Ni2+ site, Ni2+ is bonded in a water-like geometry to two equivalent Si4- atoms. Both Ni–Si bond lengths are 2.25 Å. In the third Ni2+ site, Ni2+ is bonded in a hexagonal planar geometry to six Si4- atoms. There are a spread of Ni–Si bond distances ranging from 2.34–2.37 Å. There are two inequivalent Si4- sites. In the first Si4- site, Si4- is bonded to six W2+, two equivalent Ni2+, and four Si4- atoms to form a mixture of edge, corner, and face-sharing SiSi4Ni2W6 cuboctahedra. There are a spread of Si–Si bond distances ranging from 2.37–2.54 Å. In the second Si4- site, Si4- is bonded to six W2+, four Ni2+, and two equivalent Si4- atoms to form distorted SiSi2Ni4W6 cuboctahedra that share corners with four equivalent SiSi4Ni2W6 cuboctahedra, edges with six equivalent SiSi2Ni4W6 cuboctahedra, and faces with eight SiSi4Ni2W6 cuboctahedra.

36 MATERIALS SCIENCE↗

Materials Data on Na3V3O8 by Materials Project

Na3V3O8 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a distorted single-bond geometry to one O2- atom. The Na–O bond length is 2.21 Å. In the second Na1+ site, Na1+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All Na–O bond lengths are 2.80 Å. There are two inequivalent V+4.33+ sites. In the first V+4.33+ site, V+4.33+ is bonded to four O2- atoms to form corner-sharing VO4 tetrahedra. The corner-sharing octahedral tilt angles are 16°. There is one shorter (1.68 Å) and three longer (1.76 Å) V–O bond length. In the second V+4.33+ site, V+4.33+ is bonded to six equivalent O2- atoms to form corner-sharing VO6 octahedra. All V–O bond lengths are 2.02 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+ and two V+4.33+ atoms. In the second O2- site, O2- is bonded in a linear geometry to one Na1+ and one V+4.33+ atom.

36 MATERIALS SCIENCE↗

Materials Data on SiNiMo by Materials Project

MoNiSi crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are two inequivalent Mo2+ sites. In the first Mo2+ site, Mo2+ is bonded in a 7-coordinate geometry to seven Si4- atoms. There are a spread of Mo–Si bond distances ranging from 2.72–2.86 Å. In the second Mo2+ site, Mo2+ is bonded in a 5-coordinate geometry to five Si4- atoms. There are three shorter (2.70 Å) and two longer (2.80 Å) Mo–Si bond lengths. There are three inequivalent Ni2+ sites. In the first Ni2+ site, Ni2+ is bonded in a water-like geometry to two equivalent Si4- atoms. Both Ni–Si bond lengths are 2.29 Å. In the second Ni2+ site, Ni2+ is bonded in a water-like geometry to two equivalent Si4- atoms. Both Ni–Si bond lengths are 2.27 Å. In the third Ni2+ site, Ni2+ is bonded in a hexagonal planar geometry to six Si4- atoms. There are a spread of Ni–Si bond distances ranging from 2.35–2.38 Å. There are two inequivalent Si4- sites. In the first Si4- site, Si4- is bonded to six Mo2+, two equivalent Ni2+, and four Si4- atoms to form a mixture of edge, corner, and face-sharing SiSi4Ni2Mo6 cuboctahedra. There are a spread of Si–Si bond distances ranging from 2.39–2.56 Å. In the second Si4- site, Si4- is bonded to six Mo2+, four Ni2+, and two equivalent Si4- atoms to form distorted SiSi2Ni4Mo6 cuboctahedra that share corners with four equivalent SiSi4Ni2Mo6 cuboctahedra, edges with six equivalent SiSi2Ni4Mo6 cuboctahedra, and faces with eight SiSi4Ni2Mo6 cuboctahedra.

36 MATERIALS SCIENCE↗

Materials Data on Ti3VCr2(PO4)6 by Materials Project

Ti3VCr2(PO4)6 crystallizes in the trigonal R3 space group. The structure is three-dimensional. there are three inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six PO4 tetrahedra. There is three shorter (1.90 Å) and three longer (2.01 Å) Ti–O bond length. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six PO4 tetrahedra. There is three shorter (1.91 Å) and three longer (2.07 Å) Ti–O bond length. In the third Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six PO4 tetrahedra. There is three shorter (1.89 Å) and three longer (2.06 Å) Ti–O bond length. V2+ is bonded to six O2- atoms to form VO6 octahedra that share corners with six PO4 tetrahedra. There are three shorter (2.00 Å) and three longer (2.08 Å) V–O bond lengths. There are two inequivalent Cr2+ sites. In the first Cr2+ site, Cr2+ is bonded in a 6-coordinate geometry to six O2- atoms. All Cr–O bond lengths are 2.27 Å. In the second Cr2+ site, Cr2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are three shorter (2.32 Å) and three longer (2.34 Å) Cr–O bond lengths. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one VO6 octahedra and corners with three TiO6 octahedra. The corner-sharing octahedra tilt angles range from 24–47°. There is one shorter (1.50 Å) and three longer (1.56 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one VO6 octahedra and corners with three TiO6 octahedra. The corner-sharing octahedra tilt angles range from 22–46°. There are a spread of P–O bond distances ranging from 1.53–1.56 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Ti4+ and one P5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ti4+, one Cr2+, and one P5+ atom. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to one V2+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Ti4+, one Cr2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one Ti4+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one V2+, one Cr2+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to one Ti4+, one Cr2+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a bent 150 degrees geometry to one Ti4+ and one P5+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Na3GdV2O8 by Materials Project

Na3Gd(VO4)2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a distorted single-bond geometry to one O2- atom. The Na–O bond length is 2.18 Å. In the second Na1+ site, Na1+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All Na–O bond lengths are 2.88 Å. Gd3+ is bonded to six equivalent O2- atoms to form GdO6 octahedra that share corners with six equivalent VO4 tetrahedra. All Gd–O bond lengths are 2.27 Å. V5+ is bonded to four O2- atoms to form VO4 tetrahedra that share corners with three equivalent GdO6 octahedra. The corner-sharing octahedral tilt angles are 17°. There is one shorter (1.68 Å) and three longer (1.76 Å) V–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to one Na1+ and one V5+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to one Na1+, one Gd3+, and one V5+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Na3TbV2O8 by Materials Project

Na3TbV2O8 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a distorted single-bond geometry to one O2- atom. The Na–O bond length is 2.18 Å. In the second Na1+ site, Na1+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All Na–O bond lengths are 2.84 Å. Tb3+ is bonded to six equivalent O2- atoms to form TbO6 octahedra that share corners with six equivalent VO4 tetrahedra. All Tb–O bond lengths are 2.25 Å. V5+ is bonded to four O2- atoms to form VO4 tetrahedra that share corners with three equivalent TbO6 octahedra. The corner-sharing octahedral tilt angles are 16°. There is one shorter (1.68 Å) and three longer (1.76 Å) V–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to one Na1+ and one V5+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+, one Tb3+, and one V5+ atom.

36 MATERIALS SCIENCE↗

Materials Data on Li2PrGe by Materials Project

Li2PrGe crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Li is bonded in a distorted trigonal non-coplanar geometry to four equivalent Pr and three equivalent Ge atoms. There are a spread of Li–Pr bond distances ranging from 3.03–3.11 Å. All Li–Ge bond lengths are 2.61 Å. Pr is bonded in a 8-coordinate geometry to eight equivalent Li and six equivalent Ge atoms. All Pr–Ge bond lengths are 3.50 Å. Ge is bonded in a distorted hexagonal planar geometry to six equivalent Li and six equivalent Pr atoms.

36 MATERIALS SCIENCE↗

Materials Data on K7Na(TeO8)4 by Materials Project

K7Na(TeO8)4 crystallizes in the orthorhombic Immm space group. The structure is two-dimensional and consists of two K7Na(TeO8)4 sheets oriented in the (0, 1, 0) direction. there are four inequivalent K sites. In the first K site, K is bonded in a 8-coordinate geometry to eight O atoms. There are four shorter (2.69 Å) and four longer (3.10 Å) K–O bond lengths. In the second K site, K is bonded in a 8-coordinate geometry to eight O atoms. There are four shorter (2.67 Å) and four longer (2.75 Å) K–O bond lengths. In the third K site, K is bonded in a 6-coordinate geometry to two equivalent O atoms. Both K–O bond lengths are 2.72 Å. In the fourth K site, K is bonded in a hexagonal bipyramidal geometry to eight equivalent O atoms. All K–O bond lengths are 2.80 Å. Na is bonded in a linear geometry to two equivalent O atoms. Both Na–O bond lengths are 2.28 Å. Te is bonded to six O atoms to form edge-sharing TeO6 octahedra. There are a spread of Te–O bond distances ranging from 1.89–2.06 Å. There are seven inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Te atom. In the second O site, O is bonded in a 1-coordinate geometry to two K and one Te atom. In the third O site, O is bonded in a 4-coordinate geometry to three K and one O atom. The O–O bond length is 1.29 Å. In the fourth O site, O is bonded in a 1-coordinate geometry to two K and one O atom. The O–O bond length is 1.27 Å. In the fifth O site, O is bonded in a water-like geometry to two equivalent Te atoms. In the sixth O site, O is bonded in a distorted trigonal planar geometry to one Na and two equivalent Te atoms. In the seventh O site, O is bonded in a single-bond geometry to one Te atom.

36 MATERIALS SCIENCE↗

Materials Data on Bi2Pd3S2 by Materials Project

Pd3Bi2S2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Pd is bonded in a 2-coordinate geometry to four Bi and two equivalent S atoms. There are two shorter (2.88 Å) and two longer (3.11 Å) Pd–Bi bond lengths. Both Pd–S bond lengths are 2.36 Å. There are two inequivalent Bi sites. In the first Bi site, Bi is bonded in a distorted hexagonal planar geometry to six equivalent Pd atoms. In the second Bi site, Bi is bonded to six equivalent Pd and two equivalent S atoms to form corner-sharing BiPd6S2 hexagonal bipyramids. Both Bi–S bond lengths are 2.97 Å. S is bonded in a distorted rectangular see-saw-like geometry to three equivalent Pd and one Bi atom.

36 MATERIALS SCIENCE↗

Materials Data on Ta3B2 by Materials Project

Ta3B2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are two inequivalent Ta sites. In the first Ta site, Ta is bonded in a square co-planar geometry to four equivalent B atoms. All Ta–B bond lengths are 2.53 Å. In the second Ta site, Ta is bonded in a distorted hexagonal planar geometry to six equivalent B atoms. There are four shorter (2.46 Å) and two longer (2.51 Å) Ta–B bond lengths. B is bonded in a 9-coordinate geometry to eight Ta and one B atom. The B–B bond length is 1.90 Å.

36 MATERIALS SCIENCE↗

Materials Data on CeMg2Ni9 by Materials Project

CeMg2Ni9 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Mg is bonded in a 12-coordinate geometry to twelve Ni atoms. There are a spread of Mg–Ni bond distances ranging from 2.80–2.84 Å. Ce is bonded in a distorted hexagonal planar geometry to eighteen Ni atoms. There are six shorter (2.80 Å) and twelve longer (3.15 Å) Ce–Ni bond lengths. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded to three equivalent Mg, two equivalent Ce, and seven Ni atoms to form NiCe2Mg3Ni7 cuboctahedra that share corners with seventeen NiMg6Ni6 cuboctahedra, edges with eight equivalent NiCe2Mg3Ni7 cuboctahedra, and faces with fourteen NiCe2Mg3Ni7 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.39–2.46 Å. In the second Ni site, Ni is bonded in a 12-coordinate geometry to three equivalent Ce and nine Ni atoms. All Ni–Ni bond lengths are 2.80 Å. In the third Ni site, Ni is bonded to six equivalent Mg and six equivalent Ni atoms to form NiMg6Ni6 cuboctahedra that share corners with twelve equivalent NiCe2Mg3Ni7 cuboctahedra, edges with six equivalent NiMg6Ni6 cuboctahedra, and faces with eighteen equivalent NiCe2Mg3Ni7 cuboctahedra.

36 MATERIALS SCIENCE↗