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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ta3Cr3N by Materials Project

Cr3Ta3N crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Ta is bonded in a distorted bent 150 degrees geometry to six Cr and two equivalent N atoms. There are two shorter (2.79 Å) and four longer (2.91 Å) Ta–Cr bond lengths. Both Ta–N bond lengths are 2.17 Å. There are two inequivalent Cr sites. In the first Cr site, Cr is bonded to six equivalent Ta and six equivalent Cr atoms to form CrTa6Cr6 cuboctahedra that share corners with six equivalent CrTa6Cr6 cuboctahedra, edges with six equivalent NTa6 octahedra, and faces with fourteen CrTa6Cr6 cuboctahedra. All Cr–Cr bond lengths are 2.45 Å. In the second Cr site, Cr is bonded to six equivalent Ta and six Cr atoms to form distorted CrTa6Cr6 cuboctahedra that share corners with nine CrTa6Cr6 cuboctahedra, corners with three equivalent NTa6 octahedra, faces with thirteen CrTa6Cr6 cuboctahedra, and faces with three equivalent NTa6 octahedra. The corner-sharing octahedral tilt angles are 43°. All Cr–Cr bond lengths are 2.55 Å. N is bonded to six equivalent Ta atoms to form NTa6 octahedra that share corners with six equivalent CrTa6Cr6 cuboctahedra, corners with six equivalent NTa6 octahedra, edges with six equivalent CrTa6Cr6 cuboctahedra, and faces with six equivalent CrTa6Cr6 cuboctahedra. The corner-sharing octahedral tilt angles are 42°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ta3Cr5N4 by Materials Project

(CrTaN)2TaCr3N2 crystallizes in the tetragonal P4mm space group. The structure is two-dimensional and consists of one CrTaN sheet oriented in the (0, 0, 1) direction and one TaCr3N2 sheet oriented in the (0, 0, 1) direction. In the CrTaN sheet, there are two inequivalent Ta sites. In the first Ta site, Ta is bonded to five N atoms to form a mixture of distorted corner and edge-sharing TaN5 square pyramids. There are four shorter (2.14 Å) and one longer (2.30 Å) Ta–N bond lengths. In the second Ta site, Ta is bonded to five N atoms to form a mixture of distorted corner and edge-sharing TaN5 square pyramids. There are four shorter (2.14 Å) and one longer (2.32 Å) Ta–N bond lengths. There are two inequivalent Cr sites. In the first Cr site, Cr is bonded in a single-bond geometry to one N atom. The Cr–N bond length is 2.10 Å. In the second Cr site, Cr is bonded in a single-bond geometry to one N atom. The Cr–N bond length is 2.08 Å. There are two inequivalent N sites. In the first N site, N is bonded to five Ta and one Cr atom to form a mixture of corner and edge-sharing NTa5Cr octahedra. The corner-sharing octahedral tilt angles are 19°. In the second N site, N is bonded to five Ta and one Cr atom to form a mixture of corner and edge-sharing NTa5Cr octahedra. The corner-sharing octahedral tilt angles are 18°. In the TaCr3N2 sheet, Ta is bonded to five N atoms to form TaN5 square pyramids that share corners with four equivalent TaN5 square pyramids, edges with four equivalent TaN5 square pyramids, and edges with four equivalent CrN5 square pyramids. There are four shorter (2.13 Å) and one longer (2.23 Å) Ta–N bond lengths. There are three inequivalent Cr sites. In the first Cr site, Cr is bonded in a single-bond geometry to one N atom. The Cr–N bond length is 2.06 Å. In the second Cr site, Cr is bonded in a single-bond geometry to one N atom. The Cr–N bond length is 1.87 Å. In the third Cr site, Cr is bonded to five N atoms to form CrN5 square pyramids that share corners with four equivalent CrN5 square pyramids, edges with four equivalent TaN5 square pyramids, and edges with four equivalent CrN5 square pyramids. There are four shorter (2.12 Å) and one longer (2.17 Å) Cr–N bond lengths. There are two inequivalent N sites. In the first N site, N is bonded to four equivalent Ta and two Cr atoms to form a mixture of corner and edge-sharing NTa4Cr2 octahedra. The corner-sharing octahedral tilt angles are 15°. In the second N site, N is bonded to one Ta and five Cr atoms to form NTaCr5 octahedra that share corners with four equivalent NTaCr5 octahedra and edges with eight NTa4Cr2 octahedra. The corner-sharing octahedral tilt angles are 12°.

36 MATERIALS SCIENCE↗