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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ta2Fe by Materials Project

Ta2Fe crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are six inequivalent Ta sites. In the first Ta site, Ta is bonded to six Ta and six equivalent Fe atoms to form distorted TaTa6Fe6 cuboctahedra that share corners with eighteen equivalent FeTa9Fe3 cuboctahedra, edges with eighteen TaTa6Fe6 cuboctahedra, faces with six equivalent FeTa9Fe3 cuboctahedra, and faces with fourteen TaTa6Fe6 cuboctahedra. There are two shorter (2.91 Å) and four longer (2.92 Å) Ta–Ta bond lengths. There are four shorter (2.80 Å) and two longer (2.82 Å) Ta–Fe bond lengths. In the second Ta site, Ta is bonded to eight Ta and four equivalent Fe atoms to form distorted TaTa8Fe4 cuboctahedra that share corners with twelve TaTa8Fe4 cuboctahedra, edges with eight equivalent FeTa9Fe3 cuboctahedra, edges with sixteen TaTa6Fe6 cuboctahedra, faces with eight equivalent FeTa9Fe3 cuboctahedra, and faces with ten TaTa6Fe6 cuboctahedra. There are a spread of Ta–Ta bond distances ranging from 2.76–2.88 Å. All Ta–Fe bond lengths are 2.88 Å. In the third Ta site, Ta is bonded to eight Ta and four equivalent Fe atoms to form distorted TaTa8Fe4 cuboctahedra that share corners with twelve TaTa8Fe4 cuboctahedra, edges with eight equivalent FeTa9Fe3 cuboctahedra, edges with sixteen TaTa6Fe6 cuboctahedra, faces with eight equivalent FeTa9Fe3 cuboctahedra, and faces with ten TaTa6Fe6 cuboctahedra. There are a spread of Ta–Ta bond distances ranging from 2.76–2.92 Å. All Ta–Fe bond lengths are 2.88 Å. In the fourth Ta site, Ta is bonded to eight Ta and four equivalent Fe atoms to form distorted TaTa8Fe4 cuboctahedra that share corners with twelve TaTa8Fe4 cuboctahedra, edges with eight equivalent FeTa9Fe3 cuboctahedra, edges with sixteen TaTa6Fe6 cuboctahedra, faces with eight equivalent FeTa9Fe3 cuboctahedra, and faces with ten TaTa6Fe6 cuboctahedra. The Ta–Ta bond length is 2.90 Å. All Ta–Fe bond lengths are 2.88 Å. In the fifth Ta site, Ta is bonded to eight Ta and four equivalent Fe atoms to form distorted TaTa8Fe4 cuboctahedra that share corners with twelve TaTa8Fe4 cuboctahedra, edges with eight equivalent FeTa9Fe3 cuboctahedra, edges with sixteen TaTa6Fe6 cuboctahedra, faces with eight equivalent FeTa9Fe3 cuboctahedra, and faces with ten TaTa6Fe6 cuboctahedra. There are two shorter (2.76 Å) and one longer (2.90 Å) Ta–Ta bond lengths. All Ta–Fe bond lengths are 2.88 Å. In the sixth Ta site, Ta is bonded to eight Ta and four equivalent Fe atoms to form distorted TaTa8Fe4 cuboctahedra that share corners with twelve TaTa8Fe4 cuboctahedra, edges with eight equivalent FeTa9Fe3 cuboctahedra, edges with sixteen TaTa6Fe6 cuboctahedra, faces with eight equivalent FeTa9Fe3 cuboctahedra, and faces with ten TaTa6Fe6 cuboctahedra. There are a spread of Ta–Ta bond distances ranging from 2.76–2.92 Å. All Ta–Fe bond lengths are 2.88 Å. Fe is bonded to nine Ta and three equivalent Fe atoms to form distorted FeTa9Fe3 cuboctahedra that share corners with nine equivalent TaTa6Fe6 cuboctahedra, corners with nine equivalent FeTa9Fe3 cuboctahedra, edges with six equivalent FeTa9Fe3 cuboctahedra, edges with twelve TaTa8Fe4 cuboctahedra, faces with five equivalent FeTa9Fe3 cuboctahedra, and faces with fifteen TaTa6Fe6 cuboctahedra. There are two shorter (2.80 Å) and one longer (2.83 Å) Fe–Fe bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2Fe(NF2)6 by Materials Project

(TaF6)2FeN6 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of four FeN6 clusters and eight TaF6 clusters. In each FeN6 cluster, Fe3+ is bonded in an octahedral geometry to six equivalent N+0.17- atoms. All Fe–N bond lengths are 2.01 Å. N+0.17- is bonded in a single-bond geometry to one Fe3+ atom. In each TaF6 cluster, Ta5+ is bonded in an octahedral geometry to six equivalent F1- atoms. All Ta–F bond lengths are 1.92 Å. F1- is bonded in a single-bond geometry to one Ta5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2Fe(ReSe4)2 by Materials Project

TaReFeSe4TaSe2ReSe2 crystallizes in the trigonal P3m1 space group. The structure is two-dimensional and consists of one ReSe2 sheet oriented in the (0, 0, 1) direction; one TaReFeSe4 sheet oriented in the (0, 0, 1) direction; and one TaSe2 sheet oriented in the (0, 0, 1) direction. In the ReSe2 sheet, Re3+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing ReSe6 pentagonal pyramids. All Re–Se bond lengths are 2.54 Å. Se2- is bonded in a distorted T-shaped geometry to three equivalent Re3+ atoms. In the TaReFeSe4 sheet, Ta4+ is bonded to six Se2- atoms to form distorted TaSe6 pentagonal pyramids that share corners with six equivalent FeSe6 octahedra, edges with six equivalent TaSe6 pentagonal pyramids, and a faceface with one FeSe6 octahedra. The corner-sharing octahedral tilt angles are 45°. There are three shorter (2.61 Å) and three longer (2.63 Å) Ta–Se bond lengths. Re3+ is bonded to six Se2- atoms to form distorted ReSe6 pentagonal pyramids that share corners with six equivalent FeSe6 octahedra, edges with six equivalent ReSe6 pentagonal pyramids, and a faceface with one FeSe6 octahedra. The corner-sharing octahedral tilt angles are 45°. There are three shorter (2.51 Å) and three longer (2.65 Å) Re–Se bond lengths. Fe2+ is bonded to six Se2- atoms to form FeSe6 octahedra that share corners with six equivalent TaSe6 pentagonal pyramids, corners with six equivalent ReSe6 pentagonal pyramids, edges with six equivalent FeSe6 octahedra, a faceface with one TaSe6 pentagonal pyramid, and a faceface with one ReSe6 pentagonal pyramid. There are three shorter (2.55 Å) and three longer (2.57 Å) Fe–Se bond lengths. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three equivalent Re3+ and three equivalent Fe2+ atoms to form distorted SeFe3Re3 pentagonal pyramids that share corners with three equivalent SeTa3Fe3 pentagonal pyramids and edges with nine SeFe3Re3 pentagonal pyramids. In the second Se2- site, Se2- is bonded to three equivalent Ta4+ and three equivalent Fe2+ atoms to form a mixture of distorted corner and edge-sharing SeTa3Fe3 pentagonal pyramids. In the third Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms. In the fourth Se2- site, Se2- is bonded in a distorted T-shaped geometry to three equivalent Re3+ atoms. In the TaSe2 sheet, Ta4+ is bonded to six equivalent Se2- atoms to form distorted edge-sharing TaSe6 pentagonal pyramids. All Ta–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ta4+ atoms.

36 MATERIALS SCIENCE↗