Be17Ti2 crystallizes in the hexagonal P6_3/mmc 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(2) atom. In the second Be site, Be(2) is bonded to two equivalent Be(1), four equivalent Be(3), four equivalent Be(4), and two equivalent Ti(2) atoms to form a mixture of distorted face, corner, and edge-sharing BeTi2Be10 cuboctahedra. 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), one Ti(1), and one Ti(2) atom to form a mixture of distorted face, corner, and edge-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), one Ti(2), and two equivalent Ti(1) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 18-coordinate geometry to six equivalent Be(3) and twelve equivalent Be(4) atoms. In the second Ti site, Ti(2) is bonded in a 20-coordinate geometry to two equivalent Be(1), six equivalent Be(2), six equivalent Be(3), and six equivalent Be(4) atoms.
Be17Ti2 crystallizes in the hexagonal P6_3/mmc 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(2) atom. The Be(1)-Be(1) bond length is 2.12 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(2) bond length is 2.52 Å. In the second Be site, Be(2) is bonded to two equivalent Be(1), four equivalent Be(3), four equivalent Be(4), and two equivalent Ti(2) atoms to form a mixture of distorted face, corner, and edge-sharing BeTi2Be10 cuboctahedra. All Be(2)-Be(3) bond lengths are 2.12 Å. All Be(2)-Be(4) bond lengths are 2.14 Å. Both Be(2)-Ti(2) bond lengths are 2.78 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), one Ti(1), and one Ti(2) atom to form a mixture of distorted face, corner, and edge-sharing BeTi2Be10 cuboctahedra. There is one shorter (2.14 Å) and one longer (2.20 Å) Be(3)-Be(3) bond length. There are two shorter (2.20 Å) and two longer (2.26 Å) Be(3)-Be(4) bond lengths. The Be(3)-Ti(1) bond length is 2.58 Å. The Be(3)-Ti(2) bond length is 2.61 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), one Ti(2), and two equivalent Ti(1) atoms. Both Be(4)-Be(4) bond lengths are 2.10 Å. The Be(4)-Ti(2) bond length is 2.73 Å. There is one shorter (2.68 Å) and one longer (2.82 Å) Be(4)-Ti(1) bond length. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 18-coordinate geometry to six equivalent Be(3) and twelve equivalent Be(4) atoms. In the second Ti site, Ti(2) is bonded in a 20-coordinate geometry to two equivalent Be(1), six equivalent Be(2), six equivalent Be(3), and six equivalent Be(4) atoms.