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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on LaTcN3 by Materials Project

LaTcN3 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. La3+ is bonded in a distorted body-centered cubic geometry to eight N3- atoms. There are a spread of La–N bond distances ranging from 2.61–3.03 Å. Tc6+ is bonded in a rectangular see-saw-like geometry to four N3- atoms. There are a spread of Tc–N bond distances ranging from 1.85–2.20 Å. There are four inequivalent N3- sites. In the first N3- site, N3- is bonded in a rectangular see-saw-like geometry to two equivalent La3+, one Tc6+, and one N3- atom. The N–N bond length is 1.25 Å. In the second N3- site, N3- is bonded in a 1-coordinate geometry to two equivalent La3+, one Tc6+, and one N3- atom. In the third N3- site, N3- is bonded to four equivalent La3+ and two equivalent Tc6+ atoms to form a mixture of distorted face, edge, and corner-sharing NLa4Tc2 octahedra. The corner-sharing octahedral tilt angles are 61°. In the fourth N3- site, N3- is bonded to four equivalent La3+ and two equivalent Tc6+ atoms to form a mixture of face, edge, and corner-sharing NLa4Tc2 octahedra. The corner-sharing octahedral tilt angles are 61°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaTcN3 by Materials Project

LaTcN3 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. La3+ is bonded to twelve equivalent N3- atoms to form distorted LaN12 cuboctahedra that share corners with twelve equivalent LaN12 cuboctahedra, faces with six equivalent LaN12 cuboctahedra, and faces with eight equivalent TcN6 octahedra. There are a spread of La–N bond distances ranging from 2.55–3.07 Å. Tc6+ is bonded to six equivalent N3- atoms to form TcN6 octahedra that share corners with six equivalent TcN6 octahedra and faces with eight equivalent LaN12 cuboctahedra. The corner-sharing octahedral tilt angles are 15°. All Tc–N bond lengths are 2.00 Å. N3- is bonded in a 5-coordinate geometry to four equivalent La3+ and two equivalent Tc6+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaTcN3 by Materials Project

LaTcN3 is Esseneite-derived structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to six N3- atoms to form LaN6 octahedra that share corners with six equivalent TcN4 tetrahedra and edges with two equivalent LaN6 octahedra. There are a spread of La–N bond distances ranging from 2.38–2.64 Å. In the second La3+ site, La3+ is bonded in a 8-coordinate geometry to six N3- atoms. There are a spread of La–N bond distances ranging from 2.47–2.71 Å. Tc6+ is bonded to four N3- atoms to form TcN4 tetrahedra that share corners with three equivalent LaN6 octahedra and corners with two equivalent TcN4 tetrahedra. The corner-sharing octahedra tilt angles range from 39–71°. There are a spread of Tc–N bond distances ranging from 1.80–1.92 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a 4-coordinate geometry to three La3+ and one Tc6+ atom. In the second N3- site, N3- is bonded in a distorted trigonal non-coplanar geometry to two La3+ and one Tc6+ atom. In the third N3- site, N3- is bonded in a 2-coordinate geometry to one La3+ and two equivalent Tc6+ atoms.

36 MATERIALS SCIENCE↗