Be12Ag crystallizes in the tetragonal I4/mmm space group. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded to two equivalent Be(1), four equivalent Be(2), four equivalent Be(3), and two equivalent Ag(1) atoms to form a mixture of edge, face, and corner-sharing BeBe10Ag2 cuboctahedra. In the second Be site, Be(3) is bonded to two equivalent Be(3), four equivalent Be(1), four equivalent Be(2), and two equivalent Ag(1) atoms to form a mixture of distorted edge, face, and corner-sharing BeBe10Ag2 cuboctahedra. In the third Be site, Be(2) is bonded in a 10-coordinate geometry to one Be(2), four equivalent Be(1), four equivalent Be(3), and one Ag(1) atom. Ag(1) is bonded in a 20-coordinate geometry to four equivalent Be(2), eight equivalent Be(1), and eight equivalent Be(3) atoms.
Be12Ag crystallizes in the tetragonal I4/mmm space group. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded to two equivalent Be(1), four equivalent Be(2), four equivalent Be(3), and two equivalent Ag(1) atoms to form a mixture of edge, face, and corner-sharing BeBe10Ag2 cuboctahedra. Both Be(1)-Be(1) bond lengths are 2.13 Å. All Be(1)-Be(2) bond lengths are 2.26 Å. All Be(1)-Be(3) bond lengths are 2.13 Å. Both Be(1)-Ag(1) bond lengths are 2.81 Å. In the second Be site, Be(3) is bonded to two equivalent Be(3), four equivalent Be(1), four equivalent Be(2), and two equivalent Ag(1) atoms to form a mixture of distorted edge, face, and corner-sharing BeBe10Ag2 cuboctahedra. Both Be(3)-Be(3) bond lengths are 2.44 Å. There are two shorter (2.23 Å) and two longer (2.30 Å) Be(3)-Be(2) bond lengths. Both Be(3)-Ag(1) bond lengths are 2.74 Å. In the third Be site, Be(2) is bonded in a 10-coordinate geometry to one Be(2), four equivalent Be(1), four equivalent Be(3), and one Ag(1) atom. The Be(2)-Be(2) bond length is 2.16 Å. The Be(2)-Ag(1) bond length is 2.60 Å. Ag(1) is bonded in a 20-coordinate geometry to four equivalent Be(2), eight equivalent Be(1), and eight equivalent Be(3) atoms.