Materials Data on Ta3N by Materials Project
Ta3N is H-Phase-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent Ta sites. In the first Ta site, Ta is bonded to twelve Ta atoms to form TaTa12 cuboctahedra that share corners with six equivalent TaTa12 cuboctahedra, corners with twelve equivalent NTa6 octahedra, edges with six equivalent TaTa12 cuboctahedra, faces with six equivalent TaTa12 cuboctahedra, and faces with two equivalent NTa6 octahedra. The corner-sharing octahedral tilt angles are 44°. There are six shorter (3.01 Å) and six longer (3.03 Å) Ta–Ta bond lengths. In the second Ta site, Ta is bonded in a distorted T-shaped geometry to three equivalent Ta and three equivalent N atoms. All Ta–N bond lengths are 2.19 Å. N is bonded to six equivalent Ta atoms to form NTa6 octahedra that share corners with twelve equivalent TaTa12 cuboctahedra, edges with six equivalent NTa6 octahedra, and faces with two equivalent TaTa12 cuboctahedra.