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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ta4FeTe4 by Materials Project

Ta4FeTe4 crystallizes in the orthorhombic Pbam space group. The structure is one-dimensional and consists of two Ta4FeTe4 ribbons oriented in the (1, 0, 0) direction. there are three inequivalent Ta sites. In the first Ta site, Ta is bonded in a 6-coordinate geometry to two equivalent Fe and four Te atoms. Both Ta–Fe bond lengths are 2.59 Å. There are two shorter (2.86 Å) and two longer (2.95 Å) Ta–Te bond lengths. In the second Ta site, Ta is bonded in a 6-coordinate geometry to two equivalent Fe and four Te atoms. Both Ta–Fe bond lengths are 2.60 Å. There are two shorter (2.86 Å) and two longer (2.96 Å) Ta–Te bond lengths. In the third Ta site, Ta is bonded in a 6-coordinate geometry to two equivalent Fe and four Te atoms. Both Ta–Fe bond lengths are 2.60 Å. There are two shorter (2.86 Å) and two longer (2.96 Å) Ta–Te bond lengths. Fe is bonded in a 10-coordinate geometry to eight Ta and two equivalent Fe atoms. Both Fe–Fe bond lengths are 2.43 Å. There are three inequivalent Te sites. In the first Te site, Te is bonded in a 4-coordinate geometry to four Ta atoms. The Te–Ta bond length is 2.86 Å. In the second Te site, Te is bonded in a 4-coordinate geometry to four Ta atoms. In the third Te site, Te is bonded in a 4-coordinate geometry to four Ta atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaFeTe3 by Materials Project

FeTaTe3 crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one FeTaTe3 sheet oriented in the (1, 0, 0) direction. Ta3+ is bonded to six Te2- atoms to form distorted TaTe6 octahedra that share a cornercorner with one FeTe4 tetrahedra, edges with four equivalent TaTe6 octahedra, and edges with two equivalent FeTe4 tetrahedra. There are a spread of Ta–Te bond distances ranging from 2.76–2.94 Å. Fe3+ is bonded to four Te2- atoms to form distorted FeTe4 tetrahedra that share a cornercorner with one TaTe6 octahedra, corners with two equivalent FeTe4 tetrahedra, edges with two equivalent TaTe6 octahedra, and edges with two equivalent FeTe4 tetrahedra. The corner-sharing octahedral tilt angles are 80°. There are a spread of Fe–Te bond distances ranging from 2.59–2.62 Å. There are three inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 3-coordinate geometry to three equivalent Ta3+ atoms. In the second Te2- site, Te2- is bonded in a 4-coordinate geometry to one Ta3+ and three equivalent Fe3+ atoms. In the third Te2- site, Te2- is bonded in a 3-coordinate geometry to two equivalent Ta3+ and one Fe3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta4Fe5Te12 by Materials Project

Ta4Fe5Te12 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are four inequivalent Ta+3.50+ sites. In the first Ta+3.50+ site, Ta+3.50+ is bonded to six Te2- atoms to form distorted TaTe6 octahedra that share a cornercorner with one FeTe4 tetrahedra, edges with four TaTe6 octahedra, and edges with two equivalent FeTe4 tetrahedra. There are a spread of Ta–Te bond distances ranging from 2.76–2.92 Å. In the second Ta+3.50+ site, Ta+3.50+ is bonded to six Te2- atoms to form distorted edge-sharing TaTe6 octahedra. There are a spread of Ta–Te bond distances ranging from 2.78–2.94 Å. In the third Ta+3.50+ site, Ta+3.50+ is bonded to six Te2- atoms to form distorted edge-sharing TaTe6 octahedra. There are a spread of Ta–Te bond distances ranging from 2.77–2.91 Å. In the fourth Ta+3.50+ site, Ta+3.50+ is bonded to six Te2- atoms to form distorted TaTe6 octahedra that share a cornercorner with one FeTe4 tetrahedra, edges with four TaTe6 octahedra, and edges with two equivalent FeTe4 tetrahedra. There are a spread of Ta–Te bond distances ranging from 2.76–2.94 Å. There are five inequivalent Fe2+ sites. In the first Fe2+ site, Fe2+ is bonded to four Te2- atoms to form distorted FeTe4 tetrahedra that share a cornercorner with one TaTe6 octahedra, corners with two equivalent FeTe4 tetrahedra, edges with two equivalent TaTe6 octahedra, and edges with two equivalent FeTe4 tetrahedra. The corner-sharing octahedral tilt angles are 78°. All Fe–Te bond lengths are 2.60 Å. In the second Fe2+ site, Fe2+ is bonded in a 6-coordinate geometry to two equivalent Fe2+ and four Te2- atoms. Both Fe–Fe bond lengths are 2.43 Å. There are a spread of Fe–Te bond distances ranging from 2.65–2.79 Å. In the third Fe2+ site, Fe2+ is bonded in a 4-coordinate geometry to four Te2- atoms. There are a spread of Fe–Te bond distances ranging from 2.61–2.71 Å. In the fourth Fe2+ site, Fe2+ is bonded to four Te2- atoms to form distorted FeTe4 tetrahedra that share a cornercorner with one TaTe6 octahedra, corners with two equivalent FeTe4 tetrahedra, edges with two equivalent TaTe6 octahedra, and edges with two equivalent FeTe4 tetrahedra. The corner-sharing octahedral tilt angles are 79°. There are one shorter (2.59 Å) and three longer (2.60 Å) Fe–Te bond lengths. In the fifth Fe2+ site, Fe2+ is bonded in a 7-coordinate geometry to two equivalent Fe2+ and five Te2- atoms. There are a spread of Fe–Te bond distances ranging from 2.74–2.98 Å. There are twelve inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 3-coordinate geometry to two equivalent Ta+3.50+ and one Fe2+ atom. In the second Te2- site, Te2- is bonded in a 5-coordinate geometry to two equivalent Ta+3.50+ and three Fe2+ atoms. In the third Te2- site, Te2- is bonded in a 4-coordinate geometry to two equivalent Ta+3.50+ and two Fe2+ atoms. In the fourth Te2- site, Te2- is bonded in a 3-coordinate geometry to two equivalent Ta+3.50+ and one Fe2+ atom. In the fifth Te2- site, Te2- is bonded in a 4-coordinate geometry to one Ta+3.50+ and three Fe2+ atoms. In the sixth Te2- site, Te2- is bonded in a 4-coordinate geometry to one Ta+3.50+ and three Fe2+ atoms. In the seventh Te2- site, Te2- is bonded in a 6-coordinate geometry to one Ta+3.50+ and five Fe2+ atoms. In the eighth Te2- site, Te2- is bonded in a 4-coordinate geometry to one Ta+3.50+ and three Fe2+ atoms. In the ninth Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ta+3.50+ atoms. In the tenth Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ta+3.50+ atoms. In the eleventh Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ta+3.50+ atoms. In the twelfth Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ta+3.50+ atoms.

36 MATERIALS SCIENCE↗