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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on TaOs3 by Materials Project

TaOs3 is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta5+ is bonded to twelve Os+1.67- atoms to form TaOs12 cuboctahedra that share corners with six equivalent TaOs12 cuboctahedra, corners with twelve OsTa4Os8 cuboctahedra, edges with eighteen OsTa4Os8 cuboctahedra, faces with eight equivalent TaOs12 cuboctahedra, and faces with twelve OsTa4Os8 cuboctahedra. There are six shorter (2.76 Å) and six longer (2.81 Å) Ta–Os bond lengths. There are three inequivalent Os+1.67- sites. In the first Os+1.67- site, Os+1.67- is bonded to four equivalent Ta5+ and eight Os+1.67- atoms to form distorted OsTa4Os8 cuboctahedra that share corners with four equivalent TaOs12 cuboctahedra, corners with fourteen OsTa4Os8 cuboctahedra, edges with six equivalent TaOs12 cuboctahedra, edges with twelve OsTa4Os8 cuboctahedra, faces with four equivalent TaOs12 cuboctahedra, and faces with sixteen OsTa4Os8 cuboctahedra. There are a spread of Os–Os bond distances ranging from 2.75–2.82 Å. In the second Os+1.67- site, Os+1.67- is bonded to four equivalent Ta5+ and eight Os+1.67- atoms to form distorted OsTa4Os8 cuboctahedra that share corners with four equivalent TaOs12 cuboctahedra, corners with fourteen OsTa4Os8 cuboctahedra, edges with six equivalent TaOs12 cuboctahedra, edges with twelve OsTa4Os8 cuboctahedra, faces with four equivalent TaOs12 cuboctahedra, and faces with sixteen OsTa4Os8 cuboctahedra. Both Os–Os bond lengths are 2.75 Å. In the third Os+1.67- site, Os+1.67- is bonded to four equivalent Ta5+ and eight Os+1.67- atoms to form distorted OsTa4Os8 cuboctahedra that share corners with four equivalent TaOs12 cuboctahedra, corners with fourteen OsTa4Os8 cuboctahedra, edges with six equivalent TaOs12 cuboctahedra, edges with twelve OsTa4Os8 cuboctahedra, faces with four equivalent TaOs12 cuboctahedra, and faces with sixteen OsTa4Os8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta3Os2 by Materials Project

Ta3Os2 crystallizes in the orthorhombic Cmm2 space group. The structure is three-dimensional. there are seven inequivalent Ta sites. In the first Ta site, Ta is bonded in a 6-coordinate geometry to three Ta and seven Os atoms. There are two shorter (2.74 Å) and one longer (2.88 Å) Ta–Ta bond lengths. There are a spread of Ta–Os bond distances ranging from 2.92–3.29 Å. In the second Ta site, Ta is bonded in a 6-coordinate geometry to three Ta and eight Os atoms. There are two shorter (2.75 Å) and one longer (2.84 Å) Ta–Ta bond lengths. There are a spread of Ta–Os bond distances ranging from 2.85–3.19 Å. In the third Ta site, Ta is bonded in a 4-coordinate geometry to one Ta and four Os atoms. There are a spread of Ta–Os bond distances ranging from 2.79–2.86 Å. In the fourth Ta site, Ta is bonded in a 4-coordinate geometry to one Ta and four Os atoms. There are a spread of Ta–Os bond distances ranging from 2.79–2.85 Å. In the fifth Ta site, Ta is bonded in a 7-coordinate geometry to two equivalent Ta and five Os atoms. There are one shorter (2.53 Å) and one longer (2.54 Å) Ta–Ta bond lengths. There are a spread of Ta–Os bond distances ranging from 2.85–2.90 Å. In the sixth Ta site, Ta is bonded in a 2-coordinate geometry to seven Os atoms. There are a spread of Ta–Os bond distances ranging from 2.53–2.89 Å. In the seventh Ta site, Ta is bonded in a 7-coordinate geometry to two equivalent Ta and five Os atoms. There are a spread of Ta–Os bond distances ranging from 2.84–2.90 Å. There are five inequivalent Os sites. In the first Os site, Os is bonded to six Ta and six Os atoms to form distorted OsTa6Os6 cuboctahedra that share corners with sixteen OsTa9Os3 cuboctahedra, edges with two equivalent OsTa6Os6 cuboctahedra, and faces with four equivalent OsTa9Os3 cuboctahedra. There are four shorter (2.63 Å) and two longer (2.81 Å) Os–Os bond lengths. In the second Os site, Os is bonded to eight Ta and four equivalent Os atoms to form OsTa8Os4 cuboctahedra that share corners with sixteen OsTa9Os3 cuboctahedra, edges with two equivalent OsTa8Os4 cuboctahedra, and faces with four equivalent OsTa9Os3 cuboctahedra. All Os–Os bond lengths are 2.66 Å. In the third Os site, Os is bonded to nine Ta and three Os atoms to form distorted OsTa9Os3 cuboctahedra that share corners with eleven OsTa8Os4 cuboctahedra, edges with three equivalent OsTa9Os3 cuboctahedra, and faces with seven OsTa6Os6 cuboctahedra. There are one shorter (2.69 Å) and one longer (2.86 Å) Os–Os bond lengths. In the fourth Os site, Os is bonded to nine Ta and three Os atoms to form distorted OsTa9Os3 cuboctahedra that share corners with eleven OsTa6Os6 cuboctahedra, edges with three equivalent OsTa9Os3 cuboctahedra, and faces with seven OsTa8Os4 cuboctahedra. There are one shorter (2.65 Å) and one longer (2.84 Å) Os–Os bond lengths. In the fifth Os site, Os is bonded in a distorted linear geometry to five Ta and five Os atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta3Os by Materials Project

Ta3Os is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Ta sites. In the first Ta site, Ta is bonded to four equivalent Ta and four equivalent Os atoms to form a mixture of distorted edge, face, and corner-sharing TaTa4Os4 tetrahedra. All Ta–Ta bond lengths are 2.80 Å. All Ta–Os bond lengths are 2.80 Å. In the second Ta site, Ta is bonded in a 8-coordinate geometry to eight equivalent Ta and six equivalent Os atoms. All Ta–Os bond lengths are 3.24 Å. Os is bonded in a distorted body-centered cubic geometry to fourteen Ta atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaOs3 by Materials Project

TaOs3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ta5+ is bonded to twelve equivalent Os+1.67- atoms to form TaOs12 cuboctahedra that share corners with twelve equivalent TaOs12 cuboctahedra, edges with twenty-four equivalent OsTa4Os8 cuboctahedra, faces with six equivalent TaOs12 cuboctahedra, and faces with twelve equivalent OsTa4Os8 cuboctahedra. All Ta–Os bond lengths are 2.78 Å. Os+1.67- is bonded to four equivalent Ta5+ and eight equivalent Os+1.67- atoms to form distorted OsTa4Os8 cuboctahedra that share corners with twelve equivalent OsTa4Os8 cuboctahedra, edges with eight equivalent TaOs12 cuboctahedra, edges with sixteen equivalent OsTa4Os8 cuboctahedra, faces with four equivalent TaOs12 cuboctahedra, and faces with fourteen equivalent OsTa4Os8 cuboctahedra. All Os–Os bond lengths are 2.78 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaOs3 by Materials Project

TaOs3 crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Ta5+ is bonded in a 6-coordinate geometry to six equivalent Os+1.67- atoms. All Ta–Os bond lengths are 2.89 Å. There are two inequivalent Os+1.67- sites. In the first Os+1.67- site, Os+1.67- is bonded to twelve Os+1.67- atoms to form a mixture of corner, edge, and face-sharing OsOs12 cuboctahedra. There are six shorter (2.68 Å) and six longer (2.79 Å) Os–Os bond lengths. In the second Os+1.67- site, Os+1.67- is bonded to three equivalent Ta5+ and nine Os+1.67- atoms to form distorted OsTa3Os9 cuboctahedra that share corners with eighteen equivalent OsTa3Os9 cuboctahedra, edges with twelve OsOs12 cuboctahedra, and faces with fourteen OsOs12 cuboctahedra. All Os–Os bond lengths are 2.79 Å.

36 MATERIALS SCIENCE↗