Be17Ti2 crystallizes in the trigonal R-3m space group. There are four inequivalent Be sites. In the first Be site, Be(1) is bonded in a 14-coordinate geometry to one Be(1), three equivalent Be(2), three equivalent Be(4), six equivalent Be(3), and one Ti(1) atom. In the second Be site, Be(2) is bonded in a 10-coordinate geometry to two equivalent Be(1), four equivalent Be(3), four equivalent Be(4), and two equivalent Ti(1) atoms. In the third Be site, Be(3) is bonded to two equivalent Be(1), two equivalent Be(2), two equivalent Be(3), four equivalent Be(4), and two equivalent Ti(1) atoms to form a mixture of distorted edge, face, and corner-sharing BeTi2Be10 cuboctahedra. In the fourth Be site, Be(4) is bonded in a 12-coordinate geometry to one Be(1), two equivalent Be(2), two equivalent Be(4), four equivalent Be(3), and three equivalent Ti(1) atoms. Ti(1) is bonded in a 19-coordinate geometry to one Be(1), three equivalent Be(2), six equivalent Be(3), and nine equivalent Be(4) atoms.
Be17Ti2 crystallizes in the trigonal R-3m space group. There are four inequivalent Be sites. In the first Be site, Be(1) is bonded in a 14-coordinate geometry to one Be(1), three equivalent Be(2), three equivalent Be(4), six equivalent Be(3), and one Ti(1) atom. The Be(1)-Be(1) bond length is 2.13 Å. All Be(1)-Be(2) bond lengths are 2.24 Å. All Be(1)-Be(4) bond lengths are 2.31 Å. All Be(1)-Be(3) bond lengths are 2.42 Å. The Be(1)-Ti(1) bond length is 2.55 Å. In the second Be site, Be(2) is bonded in a 10-coordinate geometry to two equivalent Be(1), four equivalent Be(3), four equivalent Be(4), and two equivalent Ti(1) atoms. All Be(2)-Be(3) bond lengths are 2.11 Å. All Be(2)-Be(4) bond lengths are 2.14 Å. Both Be(2)-Ti(1) bond lengths are 2.80 Å. In the third Be site, Be(3) is bonded to two equivalent Be(1), two equivalent Be(2), two equivalent Be(3), four equivalent Be(4), and two equivalent Ti(1) atoms to form a mixture of distorted edge, face, and corner-sharing BeTi2Be10 cuboctahedra. Both Be(3)-Be(3) bond lengths are 2.17 Å. There are two shorter (2.21 Å) and two longer (2.24 Å) Be(3)-Be(4) bond lengths. Both Be(3)-Ti(1) bond lengths are 2.60 Å. In the fourth Be site, Be(4) is bonded in a 12-coordinate geometry to one Be(1), two equivalent Be(2), two equivalent Be(4), four equivalent Be(3), and three equivalent Ti(1) atoms. Both Be(4)-Be(4) bond lengths are 2.10 Å. There are a spread of Be(4)-Ti(1) bond distances ranging from 2.65-2.81 Å. Ti(1) is bonded in a 19-coordinate geometry to one Be(1), three equivalent Be(2), six equivalent Be(3), and nine equivalent Be(4) atoms.