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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on FeTe2 by Materials Project

FeTe2 is Marcasite structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Fe3+ is bonded to six equivalent Te+1.50- atoms to form a mixture of corner and edge-sharing FeTe6 octahedra. The corner-sharing octahedral tilt angles are 56°. There are two shorter (2.56 Å) and four longer (2.57 Å) Fe–Te bond lengths. Te+1.50- is bonded in a 3-coordinate geometry to three equivalent Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K7(FeTe2)4 by Materials Project

K7(FeTe2)4 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Te2- atoms. There are four shorter (3.59 Å) and four longer (3.82 Å) K–Te bond lengths. In the second K1+ site, K1+ is bonded to four equivalent Te2- atoms to form KTe4 tetrahedra that share corners with four equivalent FeTe4 tetrahedra and edges with two equivalent KTe4 tetrahedra. There are two shorter (3.50 Å) and two longer (3.56 Å) K–Te bond lengths. In the third K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Te2- atoms. There are a spread of K–Te bond distances ranging from 3.51–4.16 Å. Fe+2.25+ is bonded to four Te2- atoms to form FeTe4 tetrahedra that share corners with two equivalent KTe4 tetrahedra and edges with three equivalent FeTe4 tetrahedra. There are a spread of Fe–Te bond distances ranging from 2.59–2.63 Å. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 6-coordinate geometry to five K1+ and three equivalent Fe+2.25+ atoms. In the second Te2- site, Te2- is bonded in a 8-coordinate geometry to seven K1+ and one Fe+2.25+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K7(FeTe2)4 by Materials Project

K7(FeTe2)4 crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. there are four inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six Te2- atoms. There are a spread of K–Te bond distances ranging from 3.48–4.00 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six Te2- atoms. There are a spread of K–Te bond distances ranging from 3.50–3.90 Å. In the third K1+ site, K1+ is bonded in a 4-coordinate geometry to six Te2- atoms. There are a spread of K–Te bond distances ranging from 3.53–4.31 Å. In the fourth K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Te2- atoms. There are a spread of K–Te bond distances ranging from 3.62–3.82 Å. There are two inequivalent Fe+2.25+ sites. In the first Fe+2.25+ site, Fe+2.25+ is bonded to four Te2- atoms to form edge-sharing FeTe4 tetrahedra. There are one shorter (2.60 Å) and three longer (2.63 Å) Fe–Te bond lengths. In the second Fe+2.25+ site, Fe+2.25+ is bonded to four Te2- atoms to form edge-sharing FeTe4 tetrahedra. There are a spread of Fe–Te bond distances ranging from 2.59–2.64 Å. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 7-coordinate geometry to six K1+ and one Fe+2.25+ atom. In the second Te2- site, Te2- is bonded in a 9-coordinate geometry to five K1+ and three Fe+2.25+ atoms. In the third Te2- site, Te2- is bonded in a 7-coordinate geometry to six K1+ and one Fe+2.25+ atom. In the fourth Te2- site, Te2- is bonded in a 8-coordinate geometry to five K1+ and three Fe+2.25+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb7(FeTe2)4 by Materials Project

Rb7(FeTe2)4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are four inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 8-coordinate geometry to eight Te2- atoms. There are a spread of Rb–Te bond distances ranging from 3.69–3.98 Å. In the second Rb1+ site, Rb1+ is bonded in a 8-coordinate geometry to eight Te2- atoms. There are a spread of Rb–Te bond distances ranging from 3.69–4.33 Å. In the third Rb1+ site, Rb1+ is bonded in a 7-coordinate geometry to seven Te2- atoms. There are a spread of Rb–Te bond distances ranging from 3.65–4.16 Å. In the fourth Rb1+ site, Rb1+ is bonded in a 5-coordinate geometry to five Te2- atoms. There are a spread of Rb–Te bond distances ranging from 3.70–4.17 Å. There are two inequivalent Fe+2.25+ sites. In the first Fe+2.25+ site, Fe+2.25+ is bonded to four Te2- atoms to form edge-sharing FeTe4 tetrahedra. There are a spread of Fe–Te bond distances ranging from 2.59–2.63 Å. In the second Fe+2.25+ site, Fe+2.25+ is bonded to four Te2- atoms to form edge-sharing FeTe4 tetrahedra. There are a spread of Fe–Te bond distances ranging from 2.59–2.63 Å. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 8-coordinate geometry to five Rb1+ and three Fe+2.25+ atoms. In the second Te2- site, Te2- is bonded in a 8-coordinate geometry to five Rb1+ and three Fe+2.25+ atoms. In the third Te2- site, Te2- is bonded in a 8-coordinate geometry to seven Rb1+ and one Fe+2.25+ atom. In the fourth Te2- site, Te2- is bonded in a distorted body-centered cubic geometry to seven Rb1+ and one Fe+2.25+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cr(FeTe2)2 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗