Ag3Tb is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. Tb(1) is bonded to four equivalent Ag(2) and eight equivalent Ag(1) atoms to form TbAg12 cuboctahedra that share corners with four equivalent Tb(1)Ag12 cuboctahedra, corners with eight equivalent Ag(2)Tb4Ag8 cuboctahedra, edges with eight equivalent Tb(1)Ag12 cuboctahedra, faces with four equivalent Tb(1)Ag12 cuboctahedra, and faces with six equivalent Ag(2)Tb4Ag8 cuboctahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to four equivalent Tb(1) and four equivalent Ag(2) atoms. In the second Ag site, Ag(2) is bonded to four equivalent Tb(1) and eight equivalent Ag(1) atoms to form distorted AgTb4Ag8 cuboctahedra that share corners with four equivalent Ag(2)Tb4Ag8 cuboctahedra, corners with eight equivalent Tb(1)Ag12 cuboctahedra, edges with eight equivalent Ag(2)Tb4Ag8 cuboctahedra, faces with four equivalent Ag(2)Tb4Ag8 cuboctahedra, and faces with six equivalent Tb(1)Ag12 cuboctahedra.
Ag3Tb is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. Tb(1) is bonded to four equivalent Ag(2) and eight equivalent Ag(1) atoms to form TbAg12 cuboctahedra that share corners with four equivalent Tb(1)Ag12 cuboctahedra, corners with eight equivalent Ag(2)Tb4Ag8 cuboctahedra, edges with eight equivalent Tb(1)Ag12 cuboctahedra, faces with four equivalent Tb(1)Ag12 cuboctahedra, and faces with six equivalent Ag(2)Tb4Ag8 cuboctahedra. All Tb(1)-Ag(2) bond lengths are 3.13 Å. All Tb(1)-Ag(1) bond lengths are 3.02 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to four equivalent Tb(1) and four equivalent Ag(2) atoms. All Ag(1)-Ag(2) bond lengths are 3.02 Å. In the second Ag site, Ag(2) is bonded to four equivalent Tb(1) and eight equivalent Ag(1) atoms to form distorted AgTb4Ag8 cuboctahedra that share corners with four equivalent Ag(2)Tb4Ag8 cuboctahedra, corners with eight equivalent Tb(1)Ag12 cuboctahedra, edges with eight equivalent Ag(2)Tb4Ag8 cuboctahedra, faces with four equivalent Ag(2)Tb4Ag8 cuboctahedra, and faces with six equivalent Tb(1)Ag12 cuboctahedra.