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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on TiNbB2 by Materials Project

TiNbB2 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Ti4+ is bonded in a 7-coordinate geometry to seven B3- atoms. There are a spread of Ti–B bond distances ranging from 2.39–2.60 Å. Nb2+ is bonded in a 7-coordinate geometry to seven B3- atoms. There are a spread of Nb–B bond distances ranging from 2.40–2.57 Å. There are two inequivalent B3- sites. In the first B3- site, B3- is bonded in a 9-coordinate geometry to four equivalent Ti4+, three equivalent Nb2+, and two equivalent B3- atoms. Both B–B bond lengths are 1.84 Å. In the second B3- site, B3- is bonded in a 9-coordinate geometry to three equivalent Ti4+, four equivalent Nb2+, and two equivalent B3- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiNbB4 by Materials Project

TiNbB4 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ti4+ is bonded to twelve equivalent B+1.50- atoms to form TiB12 cuboctahedra that share edges with twelve equivalent NbB12 cuboctahedra, faces with two equivalent NbB12 cuboctahedra, and faces with six equivalent TiB12 cuboctahedra. All Ti–B bond lengths are 2.38 Å. Nb2+ is bonded to twelve equivalent B+1.50- atoms to form NbB12 cuboctahedra that share edges with twelve equivalent TiB12 cuboctahedra, faces with two equivalent TiB12 cuboctahedra, and faces with six equivalent NbB12 cuboctahedra. All Nb–B bond lengths are 2.45 Å. B+1.50- is bonded in a 9-coordinate geometry to three equivalent Ti4+, three equivalent Nb2+, and three equivalent B+1.50- atoms. All B–B bond lengths are 1.78 Å.

36 MATERIALS SCIENCE↗