Ir3Pb is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ir(1), four equivalent Ir(2), and four equivalent Pb(1) atoms to form IrIr8Pb4 cuboctahedra that share corners with twelve equivalent Ir(1)Ir8Pb4 cuboctahedra, edges with eight equivalent Ir(1)Ir8Pb4 cuboctahedra, edges with eight equivalent Ir(2)Ir8Pb4 cuboctahedra, edges with eight equivalent Pb(1)Ir12 cuboctahedra, faces with four equivalent Ir(2)Ir8Pb4 cuboctahedra, faces with four equivalent Pb(1)Ir12 cuboctahedra, and faces with ten equivalent Ir(1)Ir8Pb4 cuboctahedra. In the second Ir site, Ir(2) is bonded to eight equivalent Ir(1) and four equivalent Pb(1) atoms to form IrIr8Pb4 cuboctahedra that share corners with four equivalent Ir(2)Ir8Pb4 cuboctahedra, corners with eight equivalent Pb(1)Ir12 cuboctahedra, edges with eight equivalent Ir(2)Ir8Pb4 cuboctahedra, edges with sixteen equivalent Ir(1)Ir8Pb4 cuboctahedra, faces with four equivalent Ir(2)Ir8Pb4 cuboctahedra, faces with six equivalent Pb(1)Ir12 cuboctahedra, and faces with eight equivalent Ir(1)Ir8Pb4 cuboctahedra. Pb(1) is bonded to four equivalent Ir(2) and eight equivalent Ir(1) atoms to form PbIr12 cuboctahedra that share corners with four equivalent Pb(1)Ir12 cuboctahedra, corners with eight equivalent Ir(2)Ir8Pb4 cuboctahedra, edges with eight equivalent Pb(1)Ir12 cuboctahedra, edges with sixteen equivalent Ir(1)Ir8Pb4 cuboctahedra, faces with four equivalent Pb(1)Ir12 cuboctahedra, faces with six equivalent Ir(2)Ir8Pb4 cuboctahedra, and faces with eight equivalent Ir(1)Ir8Pb4 cuboctahedra.
Ir3Pb is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four equivalent Ir(1), four equivalent Ir(2), and four equivalent Pb(1) atoms to form IrIr8Pb4 cuboctahedra that share corners with twelve equivalent Ir(1)Ir8Pb4 cuboctahedra, edges with eight equivalent Ir(1)Ir8Pb4 cuboctahedra, edges with eight equivalent Ir(2)Ir8Pb4 cuboctahedra, edges with eight equivalent Pb(1)Ir12 cuboctahedra, faces with four equivalent Ir(2)Ir8Pb4 cuboctahedra, faces with four equivalent Pb(1)Ir12 cuboctahedra, and faces with ten equivalent Ir(1)Ir8Pb4 cuboctahedra. All Ir(1)-Ir(1) bond lengths are 2.91 Å. All Ir(1)-Ir(2) bond lengths are 2.84 Å. All Ir(1)-Pb(1) bond lengths are 2.84 Å. In the second Ir site, Ir(2) is bonded to eight equivalent Ir(1) and four equivalent Pb(1) atoms to form IrIr8Pb4 cuboctahedra that share corners with four equivalent Ir(2)Ir8Pb4 cuboctahedra, corners with eight equivalent Pb(1)Ir12 cuboctahedra, edges with eight equivalent Ir(2)Ir8Pb4 cuboctahedra, edges with sixteen equivalent Ir(1)Ir8Pb4 cuboctahedra, faces with four equivalent Ir(2)Ir8Pb4 cuboctahedra, faces with six equivalent Pb(1)Ir12 cuboctahedra, and faces with eight equivalent Ir(1)Ir8Pb4 cuboctahedra. All Ir(2)-Pb(1) bond lengths are 2.91 Å. Pb(1) is bonded to four equivalent Ir(2) and eight equivalent Ir(1) atoms to form PbIr12 cuboctahedra that share corners with four equivalent Pb(1)Ir12 cuboctahedra, corners with eight equivalent Ir(2)Ir8Pb4 cuboctahedra, edges with eight equivalent Pb(1)Ir12 cuboctahedra, edges with sixteen equivalent Ir(1)Ir8Pb4 cuboctahedra, faces with four equivalent Pb(1)Ir12 cuboctahedra, faces with six equivalent Ir(2)Ir8Pb4 cuboctahedra, and faces with eight equivalent Ir(1)Ir8Pb4 cuboctahedra.