Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Ta”

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 667 records · Page 37
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ta2V3Cu by Materials Project

Ta2V3Cu crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta is bonded in a 3-coordinate geometry to four equivalent Ta, nine equivalent V, and three equivalent Cu atoms. There are three shorter (3.02 Å) and one longer (3.20 Å) Ta–Ta bond lengths. There are three shorter (2.93 Å) and six longer (2.95 Å) Ta–V bond lengths. All Ta–Cu bond lengths are 2.90 Å. V is bonded to six equivalent Ta, four equivalent V, and two equivalent Cu atoms to form distorted VTa6V4Cu2 cuboctahedra that share corners with four equivalent CuTa6V6 cuboctahedra, corners with fourteen equivalent VTa6V4Cu2 cuboctahedra, edges with six equivalent VTa6V4Cu2 cuboctahedra, faces with six equivalent CuTa6V6 cuboctahedra, and faces with twelve equivalent VTa6V4Cu2 cuboctahedra. There are two shorter (2.37 Å) and two longer (2.58 Å) V–V bond lengths. Both V–Cu bond lengths are 2.57 Å. Cu is bonded to six equivalent Ta and six equivalent V atoms to form CuTa6V6 cuboctahedra that share corners with twelve equivalent VTa6V4Cu2 cuboctahedra, edges with six equivalent CuTa6V6 cuboctahedra, faces with two equivalent CuTa6V6 cuboctahedra, and faces with eighteen equivalent VTa6V4Cu2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta4MoS8 by Materials Project

Ta2MoS4(TaS2)2 is Molybdenite-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one Ta2MoS4 sheet oriented in the (0, 0, 1) direction and two TaS2 sheets oriented in the (0, 0, 1) direction. In the Ta2MoS4 sheet, Ta+3.50+ is bonded to six S2- atoms to form distorted TaS6 pentagonal pyramids that share corners with six equivalent MoS6 octahedra, edges with six equivalent TaS6 pentagonal pyramids, and a faceface with one MoS6 octahedra. The corner-sharing octahedral tilt angles are 45°. There are three shorter (2.48 Å) and three longer (2.49 Å) Ta–S bond lengths. Mo2+ is bonded to six equivalent S2- atoms to form MoS6 octahedra that share corners with twelve equivalent TaS6 pentagonal pyramids, edges with six equivalent MoS6 octahedra, and faces with two equivalent TaS6 pentagonal pyramids. All Mo–S bond lengths are 2.51 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to three equivalent Ta+3.50+ atoms. In the second S2- site, S2- is bonded in a 6-coordinate geometry to three equivalent Ta+3.50+ and three equivalent Mo2+ atoms. In each TaS2 sheet, Ta+3.50+ is bonded to six S2- atoms to form distorted edge-sharing TaS6 pentagonal pyramids. There are three shorter (2.47 Å) and three longer (2.48 Å) Ta–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to three equivalent Ta+3.50+ atoms. In the second S2- site, S2- is bonded in a 3-coordinate geometry to three equivalent Ta+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2Co3Ge by Materials Project

Ta2Co3Ge crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta is bonded in a 12-coordinate geometry to four equivalent Ta, nine equivalent Co, and three equivalent Ge atoms. There are one shorter (2.91 Å) and three longer (2.97 Å) Ta–Ta bond lengths. There are three shorter (2.74 Å) and six longer (2.85 Å) Ta–Co bond lengths. All Ta–Ge bond lengths are 2.86 Å. Co is bonded to six equivalent Ta, four equivalent Co, and two equivalent Ge atoms to form distorted CoTa6Co4Ge2 cuboctahedra that share corners with four equivalent GeTa6Co6 cuboctahedra, corners with fourteen equivalent CoTa6Co4Ge2 cuboctahedra, edges with six equivalent CoTa6Co4Ge2 cuboctahedra, faces with six equivalent GeTa6Co6 cuboctahedra, and faces with twelve equivalent CoTa6Co4Ge2 cuboctahedra. There are two shorter (2.37 Å) and two longer (2.52 Å) Co–Co bond lengths. Both Co–Ge bond lengths are 2.40 Å. Ge is bonded to six equivalent Ta and six equivalent Co atoms to form GeTa6Co6 cuboctahedra that share corners with twelve equivalent CoTa6Co4Ge2 cuboctahedra, edges with six equivalent GeTa6Co6 cuboctahedra, faces with two equivalent GeTa6Co6 cuboctahedra, and faces with eighteen equivalent CoTa6Co4Ge2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2Ta2P7O24 by Materials Project

Rb2Ta2P7O24 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a distorted body-centered cubic geometry to eight O atoms. There are a spread of Rb–O bond distances ranging from 2.90–3.21 Å. In the second Rb site, Rb is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Rb–O bond distances ranging from 2.94–3.17 Å. Ta is bonded to six O atoms to form TaO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Ta–O bond distances ranging from 1.96–1.99 Å. There are four inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with three equivalent TaO6 octahedra. The corner-sharing octahedra tilt angles range from 22–36°. There is one shorter (1.49 Å) and three longer (1.57 Å) P–O bond length. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with two equivalent TaO6 octahedra and a cornercorner with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 4–22°. There are a spread of P–O bond distances ranging from 1.49–1.63 Å. In the third P site, P is bonded to four O atoms to form PO4 tetrahedra that share a cornercorner with one TaO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedral tilt angles are 10°. There are a spread of P–O bond distances ranging from 1.47–1.62 Å. In the fourth P site, P is bonded to four O atoms to form corner-sharing PO4 tetrahedra. There is two shorter (1.51 Å) and two longer (1.60 Å) P–O bond length. There are thirteen inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to three Rb and one P atom. In the second O site, O is bonded in a distorted single-bond geometry to one Rb and one P atom. In the third O site, O is bonded in a linear geometry to one Ta and one P atom. In the fourth O site, O is bonded in a distorted single-bond geometry to one Rb and one P atom. In the fifth O site, O is bonded in a single-bond geometry to one P atom. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Ta and one P atom. In the seventh O site, O is bonded in a single-bond geometry to three Rb and one P atom. In the eighth O site, O is bonded in a bent 120 degrees geometry to two P atoms. In the ninth O site, O is bonded in a bent 150 degrees geometry to one Ta and one P atom. In the tenth O site, O is bonded in a linear geometry to one Ta and one P atom. In the eleventh O site, O is bonded in a bent 120 degrees geometry to two P atoms. In the twelfth O site, O is bonded in a bent 150 degrees geometry to one Ta and one P atom. In the thirteenth O site, O is bonded in a bent 150 degrees geometry to one Ta and one P atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta4NiS8 by Materials Project

Ta2NiS4(TaS2)2 crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one Ta2NiS4 sheet oriented in the (0, 0, 1) direction and two TaS2 sheets oriented in the (0, 0, 1) direction. In the Ta2NiS4 sheet, Ta+3.50+ is bonded to six S2- atoms to form distorted TaS6 pentagonal pyramids that share corners with six equivalent NiS6 octahedra, edges with six equivalent TaS6 pentagonal pyramids, and a faceface with one NiS6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are three shorter (2.49 Å) and three longer (2.51 Å) Ta–S bond lengths. Ni2+ is bonded to six equivalent S2- atoms to form NiS6 octahedra that share corners with twelve equivalent TaS6 pentagonal pyramids, edges with six equivalent NiS6 octahedra, and faces with two equivalent TaS6 pentagonal pyramids. All Ni–S bond lengths are 2.42 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to three equivalent Ta+3.50+ and three equivalent Ni2+ atoms to form a mixture of distorted edge and corner-sharing STa3Ni3 pentagonal pyramids. In the second S2- site, S2- is bonded in a 3-coordinate geometry to three equivalent Ta+3.50+ atoms. In each TaS2 sheet, Ta+3.50+ is bonded to six S2- atoms to form distorted edge-sharing TaS6 pentagonal pyramids. All Ta–S bond lengths are 2.49 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to three equivalent Ta+3.50+ atoms. In the second S2- site, S2- is bonded in a 3-coordinate geometry to three equivalent Ta+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2Co3Si by Materials Project

Ta2Co3Si is Hexagonal Laves-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta is bonded in a 12-coordinate geometry to four equivalent Ta, nine equivalent Co, and three equivalent Si atoms. There are one shorter (2.88 Å) and three longer (2.94 Å) Ta–Ta bond lengths. There are three shorter (2.72 Å) and six longer (2.82 Å) Ta–Co bond lengths. All Ta–Si bond lengths are 2.84 Å. Co is bonded to six equivalent Ta, four equivalent Co, and two equivalent Si atoms to form CoTa6Co4Si2 cuboctahedra that share corners with four equivalent SiTa6Co6 cuboctahedra, corners with fourteen equivalent CoTa6Co4Si2 cuboctahedra, edges with six equivalent CoTa6Co4Si2 cuboctahedra, faces with six equivalent SiTa6Co6 cuboctahedra, and faces with twelve equivalent CoTa6Co4Si2 cuboctahedra. There are two shorter (2.39 Å) and two longer (2.47 Å) Co–Co bond lengths. Both Co–Si bond lengths are 2.37 Å. Si is bonded to six equivalent Ta and six equivalent Co atoms to form SiTa6Co6 cuboctahedra that share corners with twelve equivalent CoTa6Co4Si2 cuboctahedra, edges with six equivalent SiTa6Co6 cuboctahedra, faces with two equivalent SiTa6Co6 cuboctahedra, and faces with eighteen equivalent CoTa6Co4Si2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta3CoS6 by Materials Project

Ta3CoS6 is Ilmenite-like structured and crystallizes in the hexagonal P6_322 space group. The structure is three-dimensional. there are two inequivalent Ta+3.67+ sites. In the first Ta+3.67+ site, Ta+3.67+ is bonded to six equivalent S2- atoms to form distorted TaS6 pentagonal pyramids that share corners with six equivalent CoS6 octahedra and edges with six equivalent TaS6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 46°. All Ta–S bond lengths are 2.47 Å. In the second Ta+3.67+ site, Ta+3.67+ is bonded to six equivalent S2- atoms to form distorted TaS6 pentagonal pyramids that share corners with three equivalent CoS6 octahedra, edges with six TaS6 pentagonal pyramids, and a faceface with one CoS6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are three shorter (2.47 Å) and three longer (2.49 Å) Ta–S bond lengths. Co1+ is bonded to six equivalent S2- atoms to form CoS6 octahedra that share corners with twelve TaS6 pentagonal pyramids and faces with two equivalent TaS6 pentagonal pyramids. All Co–S bond lengths are 2.38 Å. S2- is bonded in a distorted rectangular see-saw-like geometry to three Ta+3.67+ and one Co1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2MnV3 by Materials Project

Ta2V3Mn crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ta is bonded in a 12-coordinate geometry to four equivalent Ta, nine equivalent V, and three equivalent Mn atoms. There are one shorter (3.02 Å) and three longer (3.07 Å) Ta–Ta bond lengths. There are three shorter (2.90 Å) and six longer (2.93 Å) Ta–V bond lengths. All Ta–Mn bond lengths are 2.95 Å. V is bonded to six equivalent Ta, four equivalent V, and two equivalent Mn atoms to form VTa6Mn2V4 cuboctahedra that share corners with four equivalent MnTa6V6 cuboctahedra, corners with fourteen equivalent VTa6Mn2V4 cuboctahedra, edges with six equivalent VTa6Mn2V4 cuboctahedra, faces with six equivalent MnTa6V6 cuboctahedra, and faces with twelve equivalent VTa6Mn2V4 cuboctahedra. All V–V bond lengths are 2.52 Å. Both V–Mn bond lengths are 2.48 Å. Mn is bonded to six equivalent Ta and six equivalent V atoms to form distorted MnTa6V6 cuboctahedra that share corners with six equivalent MnTa6V6 cuboctahedra, corners with twelve equivalent VTa6Mn2V4 cuboctahedra, edges with six equivalent MnTa6V6 cuboctahedra, and faces with eighteen equivalent VTa6Mn2V4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2V3Ge by Materials Project

Ta2V3Ge crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta is bonded in a 3-coordinate geometry to four equivalent Ta, nine equivalent V, and three equivalent Ge atoms. There are three shorter (3.07 Å) and one longer (3.16 Å) Ta–Ta bond lengths. There are six shorter (2.95 Å) and three longer (2.97 Å) Ta–V bond lengths. All Ta–Ge bond lengths are 2.93 Å. V is bonded to six equivalent Ta, four equivalent V, and two equivalent Ge atoms to form distorted VTa6V4Ge2 cuboctahedra that share corners with four equivalent GeTa6V6 cuboctahedra, corners with fourteen equivalent VTa6V4Ge2 cuboctahedra, edges with six equivalent VTa6V4Ge2 cuboctahedra, faces with six equivalent GeTa6V6 cuboctahedra, and faces with twelve equivalent VTa6V4Ge2 cuboctahedra. There are two shorter (2.40 Å) and two longer (2.59 Å) V–V bond lengths. Both V–Ge bond lengths are 2.58 Å. Ge is bonded to six equivalent Ta and six equivalent V atoms to form GeTa6V6 cuboctahedra that share corners with twelve equivalent VTa6V4Ge2 cuboctahedra, edges with six equivalent GeTa6V6 cuboctahedra, faces with two equivalent GeTa6V6 cuboctahedra, and faces with eighteen equivalent VTa6V4Ge2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2V3Si by Materials Project

Ta2V3Si crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta is bonded in a 3-coordinate geometry to four equivalent Ta, nine equivalent V, and three equivalent Si atoms. There are three shorter (3.04 Å) and one longer (3.15 Å) Ta–Ta bond lengths. There are six shorter (2.93 Å) and three longer (2.96 Å) Ta–V bond lengths. All Ta–Si bond lengths are 2.91 Å. V is bonded to six equivalent Ta, four equivalent V, and two equivalent Si atoms to form distorted VTa6V4Si2 cuboctahedra that share corners with four equivalent SiTa6V6 cuboctahedra, corners with fourteen equivalent VTa6V4Si2 cuboctahedra, edges with six equivalent VTa6V4Si2 cuboctahedra, faces with six equivalent SiTa6V6 cuboctahedra, and faces with twelve equivalent VTa6V4Si2 cuboctahedra. There are two shorter (2.42 Å) and two longer (2.53 Å) V–V bond lengths. Both V–Si bond lengths are 2.55 Å. Si is bonded to six equivalent Ta and six equivalent V atoms to form SiTa6V6 cuboctahedra that share corners with twelve equivalent VTa6V4Si2 cuboctahedra, edges with six equivalent SiTa6V6 cuboctahedra, faces with two equivalent SiTa6V6 cuboctahedra, and faces with eighteen equivalent VTa6V4Si2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta5(NiP)4 by Materials Project

Ta5(NiP)4 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. there are two inequivalent Ta sites. In the first Ta site, Ta is bonded in a 5-coordinate geometry to five equivalent P atoms. There are a spread of Ta–P bond distances ranging from 2.57–2.71 Å. In the second Ta site, Ta is bonded in a square co-planar geometry to four equivalent P atoms. All Ta–P bond lengths are 2.62 Å. Ni is bonded in a 3-coordinate geometry to three equivalent P atoms. There are two shorter (2.21 Å) and one longer (2.25 Å) Ni–P bond lengths. P is bonded in a 9-coordinate geometry to six Ta and three equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaVCu by Materials Project

TaVCu crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Ta is bonded in a 12-coordinate geometry to four equivalent Ta, six equivalent V, and six equivalent Cu atoms. There are two shorter (3.04 Å) and two longer (3.07 Å) Ta–Ta bond lengths. There are two shorter (2.93 Å) and four longer (2.95 Å) Ta–V bond lengths. There are four shorter (2.84 Å) and two longer (3.01 Å) Ta–Cu bond lengths. V is bonded to six equivalent Ta, two equivalent V, and four equivalent Cu atoms to form distorted VTa6V2Cu4 cuboctahedra that share corners with eight equivalent CuTa6V4Cu2 cuboctahedra, corners with ten equivalent VTa6V2Cu4 cuboctahedra, edges with six equivalent VTa6V2Cu4 cuboctahedra, faces with six equivalent VTa6V2Cu4 cuboctahedra, and faces with twelve equivalent CuTa6V4Cu2 cuboctahedra. Both V–V bond lengths are 2.40 Å. All V–Cu bond lengths are 2.51 Å. Cu is bonded to six equivalent Ta, four equivalent V, and two equivalent Cu atoms to form CuTa6V4Cu2 cuboctahedra that share corners with eight equivalent VTa6V2Cu4 cuboctahedra, corners with ten equivalent CuTa6V4Cu2 cuboctahedra, edges with six equivalent CuTa6V4Cu2 cuboctahedra, faces with six equivalent CuTa6V4Cu2 cuboctahedra, and faces with twelve equivalent VTa6V2Cu4 cuboctahedra. Both Cu–Cu bond lengths are 2.53 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta3(InS3)2 by Materials Project

Ta3(InS3)2 crystallizes in the trigonal R32 space group. The structure is three-dimensional. there are two inequivalent Ta+3.33+ sites. In the first Ta+3.33+ site, Ta+3.33+ is bonded to six equivalent S2- atoms to form distorted edge-sharing TaS6 pentagonal pyramids. All Ta–S bond lengths are 2.49 Å. In the second Ta+3.33+ site, Ta+3.33+ is bonded to six equivalent S2- atoms to form distorted edge-sharing TaS6 pentagonal pyramids. All Ta–S bond lengths are 2.49 Å. In1+ is bonded in a 6-coordinate geometry to six equivalent S2- atoms. All In–S bond lengths are 3.15 Å. S2- is bonded in a 5-coordinate geometry to three Ta+3.33+ and two equivalent In1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2(PdRu)3 by Materials Project

Ta2(RuPd)3 is Uranium Silicide-derived structured and crystallizes in the orthorhombic Pmmm space group. The structure is three-dimensional. Ta is bonded to six Ru and six Pd atoms to form TaPd6Ru6 cuboctahedra that share corners with four equivalent RuTa4Pd4 cuboctahedra, corners with twelve equivalent TaPd6Ru6 cuboctahedra, edges with two equivalent RuTa4Pd4 cuboctahedra, edges with twelve PdTa4Pd2Ru6 cuboctahedra, faces with six equivalent TaPd6Ru6 cuboctahedra, and faces with six PdTa4Pd2Ru6 cuboctahedra. There are a spread of Ta–Ru bond distances ranging from 2.71–2.78 Å. All Ta–Pd bond lengths are 2.81 Å. There are three inequivalent Ru sites. In the first Ru site, Ru is bonded to four equivalent Ta and four equivalent Pd atoms to form distorted RuTa4Pd4 cuboctahedra that share corners with eight equivalent TaPd6Ru6 cuboctahedra, corners with sixteen PdTa4Pd2Ru6 cuboctahedra, edges with four equivalent TaPd6Ru6 cuboctahedra, edges with four equivalent RuTa4Pd4 cuboctahedra, edges with four equivalent PdTa4Pd2Ru6 cuboctahedra, and faces with two equivalent PdTa4Pd4Ru4 cuboctahedra. All Ru–Pd bond lengths are 2.74 Å. In the second Ru site, Ru is bonded in a distorted square co-planar geometry to four equivalent Ta and eight Pd atoms. There are four shorter (2.78 Å) and four longer (2.81 Å) Ru–Pd bond lengths. In the third Ru site, Ru is bonded in a distorted square co-planar geometry to four equivalent Ta and four equivalent Pd atoms. All Ru–Pd bond lengths are 2.78 Å. There are two inequivalent Pd sites. In the first Pd site, Pd is bonded to four equivalent Ta, six Ru, and two equivalent Pd atoms to form distorted PdTa4Pd2Ru6 cuboctahedra that share corners with four equivalent RuTa4Pd4 cuboctahedra, corners with twelve equivalent PdTa4Pd2Ru6 cuboctahedra, edges with two equivalent RuTa4Pd4 cuboctahedra, edges with four equivalent PdTa4Pd4Ru4 cuboctahedra, edges with eight equivalent TaPd6Ru6 cuboctahedra, faces with four equivalent TaPd6Ru6 cuboctahedra, and faces with eight PdTa4Pd2Ru6 cuboctahedra. Both Pd–Pd bond lengths are 2.75 Å. In the second Pd site, Pd is bonded to four equivalent Ta, four equivalent Ru, and four equivalent Pd atoms to form distorted PdTa4Pd4Ru4 cuboctahedra that share corners with four equivalent PdTa4Pd4Ru4 cuboctahedra, corners with eight equivalent RuTa4Pd4 cuboctahedra, edges with eight equivalent TaPd6Ru6 cuboctahedra, edges with eight equivalent PdTa4Pd2Ru6 cuboctahedra, faces with two equivalent RuTa4Pd4 cuboctahedra, faces with four equivalent TaPd6Ru6 cuboctahedra, and faces with eight PdTa4Pd2Ru6 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2Cr3Si by Materials Project

Ta2Cr3Si crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta is bonded in a 12-coordinate geometry to four equivalent Ta, nine equivalent Cr, and three equivalent Si atoms. All Ta–Ta bond lengths are 3.00 Å. There are six shorter (2.86 Å) and three longer (2.89 Å) Ta–Cr bond lengths. All Ta–Si bond lengths are 2.86 Å. Cr is bonded to six equivalent Ta, four equivalent Cr, and two equivalent Si atoms to form distorted CrTa6Cr4Si2 cuboctahedra that share corners with four equivalent SiTa6Cr6 cuboctahedra, corners with fourteen equivalent CrTa6Cr4Si2 cuboctahedra, edges with six equivalent CrTa6Cr4Si2 cuboctahedra, faces with six equivalent SiTa6Cr6 cuboctahedra, and faces with twelve equivalent CrTa6Cr4Si2 cuboctahedra. There are two shorter (2.36 Å) and two longer (2.51 Å) Cr–Cr bond lengths. Both Cr–Si bond lengths are 2.49 Å. Si is bonded to six equivalent Ta and six equivalent Cr atoms to form SiTa6Cr6 cuboctahedra that share corners with twelve equivalent CrTa6Cr4Si2 cuboctahedra, edges with six equivalent SiTa6Cr6 cuboctahedra, faces with two equivalent SiTa6Cr6 cuboctahedra, and faces with eighteen equivalent CrTa6Cr4Si2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2GaCo3 by Materials Project

Ta2Co3Ga crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ta is bonded in a 12-coordinate geometry to four equivalent Ta, nine equivalent Co, and three equivalent Ga atoms. There are one shorter (2.89 Å) and three longer (2.98 Å) Ta–Ta bond lengths. There are three shorter (2.73 Å) and six longer (2.85 Å) Ta–Co bond lengths. All Ta–Ga bond lengths are 2.87 Å. Co is bonded to six equivalent Ta, four equivalent Co, and two equivalent Ga atoms to form CoTa6Ga2Co4 cuboctahedra that share corners with four equivalent GaTa6Co6 cuboctahedra, corners with fourteen equivalent CoTa6Ga2Co4 cuboctahedra, edges with six equivalent CoTa6Ga2Co4 cuboctahedra, faces with six equivalent GaTa6Co6 cuboctahedra, and faces with twelve equivalent CoTa6Ga2Co4 cuboctahedra. There are two shorter (2.36 Å) and two longer (2.54 Å) Co–Co bond lengths. Both Co–Ga bond lengths are 2.41 Å. Ga is bonded to six equivalent Ta and six equivalent Co atoms to form GaTa6Co6 cuboctahedra that share corners with twelve equivalent CoTa6Ga2Co4 cuboctahedra, edges with six equivalent GaTa6Co6 cuboctahedra, faces with two equivalent GaTa6Co6 cuboctahedra, and faces with eighteen equivalent CoTa6Ga2Co4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta2Co4O9 by Materials Project

Ta2Co4O9 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.87–2.27 Å. In the second Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.87–2.28 Å. In the third Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.87–2.28 Å. In the fourth Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.87–2.27 Å. In the fifth Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.86–2.28 Å. In the sixth Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.87–2.27 Å. In the seventh Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.87–2.28 Å. In the eighth Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.87–2.28 Å. There are sixteen inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of distorted edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 47–67°. There are a spread of Co–O bond distances ranging from 2.03–2.29 Å. In the second Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of distorted edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–67°. There are a spread of Co–O bond distances ranging from 2.03–2.29 Å. In the third Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 47–48°. There are a spread of Co–O bond distances ranging from 2.02–2.32 Å. In the fourth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–48°. There are a spread of Co–O bond distances ranging from 2.01–2.32 Å. In the fifth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 47–48°. There are a spread of Co–O bond distances ranging from 2.02–2.32 Å. In the sixth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–48°. There are a spread of Co–O bond distances ranging from 2.01–2.32 Å. In the seventh Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 47–66°. There are a spread of Co–O bond distances ranging from 2.03–2.27 Å. In the eighth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–66°. There are a spread of Co–O bond distances ranging from 2.03–2.27 Å. In the ninth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of distorted edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–67°. There are a spread of Co–O bond distances ranging from 2.03–2.29 Å. In the tenth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of distorted edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–67°. There are a spread of Co–O bond distances ranging from 2.03–2.30 Å. In the eleventh Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 47–48°. There are a spread of Co–O bond distances ranging from 2.01–2.32 Å. In the twelfth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–48°. There are a spread of Co–O bond distances ranging from 2.01–2.32 Å. In the thirteenth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–48°. There are a spread of Co–O bond distances ranging from 2.02–2.31 Å. In the fourteenth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–48°. There are a spread of Co–O bond distances ranging from 2.01–2.31 Å. In the fifteenth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 46–66°. There are a spread of Co–O bond distances ranging from 2.03–2.27 Å. In the sixteenth Co2+ site, Co2+ is bonded to six O2- atoms to form a mixture of edge, corner, and face-sharing CoO6 octahedra. The corner-sharing octahedra tilt angles range from 47–66°. There are a spread of Co–O bond distances ranging from 2.04–2.27 Å. There are thirty-six inequivalent O2- sites. In the first O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the second O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the seventh O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the eighth O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the ninth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the tenth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the eleventh O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the twelfth O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the thirteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the fourteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the fifteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the sixteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the seventeenth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the eighteenth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the nineteenth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the twentieth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the twenty-first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the twenty-second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the twenty-third O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the twenty-fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the twenty-fifth O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the twenty-sixth O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the twenty-seventh O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the twenty-eighth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the twenty-ninth O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the thirtieth O2- site, O2- is bonded in a 5-coordinate geometry to one Ta5+ and four Co2+ atoms. In the thirty-first O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the thirty-second O2- site, O2- is bonded in a 4-coordinate geometry to one Ta5+ and three Co2+ atoms. In the thirty-third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the thirty-fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ta5+ and two Co2+ atoms. In the thirty-fifth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids. In the thirty-sixth O2- site, O2- is bonded to two Ta5+ and two Co2+ atoms to form a mixture of distorted edge and corner-sharing OTa2Co2 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3TaO2F7 by Materials Project

K3TaO2F7 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 4-coordinate geometry to four equivalent F atoms. There are two shorter (2.63 Å) and two longer (2.71 Å) K–F bond lengths. In the second K site, K is bonded in a 8-coordinate geometry to one O and seven F atoms. The K–O bond length is 3.00 Å. There are a spread of K–F bond distances ranging from 2.51–3.19 Å. Ta is bonded in a distorted pentagonal bipyramidal geometry to two equivalent O and five F atoms. Both Ta–O bond lengths are 2.12 Å. There are a spread of Ta–F bond distances ranging from 1.92–1.95 Å. O is bonded in a 3-coordinate geometry to one K, one Ta, and one O atom. The O–O bond length is 1.35 Å. There are five inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to two equivalent K and one Ta atom. In the second F site, F is bonded in a distorted single-bond geometry to two equivalent K and one Ta atom. In the third F site, F is bonded to four K atoms to form a mixture of distorted edge and corner-sharing FK4 trigonal pyramids. In the fourth F site, F is bonded in a distorted trigonal planar geometry to two equivalent K and one Ta atom. In the fifth F site, F is bonded in a distorted single-bond geometry to two equivalent K and one Ta atom.

36 MATERIALS SCIENCE↗