La2(PbSn)3 crystallizes in the orthorhombic Pmmm space group. La(1) is bonded to two equivalent Pb(2), four equivalent Pb(1), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form LaSn6Pb6 cuboctahedra that share corners with twelve equivalent La(1)Sn6Pb6 cuboctahedra, edges with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)La4Pb8 cuboctahedra, edges with eight equivalent Pb(1)La4Sn6Pb2 cuboctahedra, faces with two equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)La4Pb8 cuboctahedra, faces with four equivalent Pb(1)La4Sn6Pb2 cuboctahedra, and faces with six equivalent La(1)Sn6Pb6 cuboctahedra. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to four equivalent La(1), two equivalent Pb(2), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form distorted PbLa4Sn6Pb2 cuboctahedra that share corners with twelve equivalent Pb(1)La4Sn6Pb2 cuboctahedra, edges with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)La4Pb8 cuboctahedra, edges with eight equivalent La(1)Sn6Pb6 cuboctahedra, faces with two equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)La4Pb8 cuboctahedra, faces with four equivalent La(1)Sn6Pb6 cuboctahedra, and faces with six equivalent Pb(1)La4Sn6Pb2 cuboctahedra. In the second Pb site, Pb(2) is bonded to four equivalent La(1), four equivalent Pb(1), and four equivalent Sn(2) atoms to form distorted PbLa4Sn4Pb4 cuboctahedra that share corners with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, edges with eight equivalent La(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)La4Sn6Pb2 cuboctahedra, faces with four equivalent La(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)La4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)La4Pb8 cuboctahedra. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Pb(1) atoms. In the second Sn site, Sn(2) is bonded to four equivalent La(1), four equivalent Pb(1), and four equivalent Pb(2) atoms to form SnLa4Pb8 cuboctahedra that share corners with four equivalent Sn(2)La4Pb8 cuboctahedra, edges with eight equivalent La(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)La4Sn6Pb2 cuboctahedra, faces with four equivalent La(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)La4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)La4Pb8 cuboctahedra. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Pb(1) atoms.
La2(PbSn)3 crystallizes in the orthorhombic Pmmm space group. La(1) is bonded to two equivalent Pb(2), four equivalent Pb(1), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form LaSn6Pb6 cuboctahedra that share corners with twelve equivalent La(1)Sn6Pb6 cuboctahedra, edges with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)La4Pb8 cuboctahedra, edges with eight equivalent Pb(1)La4Sn6Pb2 cuboctahedra, faces with two equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)La4Pb8 cuboctahedra, faces with four equivalent Pb(1)La4Sn6Pb2 cuboctahedra, and faces with six equivalent La(1)Sn6Pb6 cuboctahedra. Both La(1)-Pb(2) bond lengths are 3.49 Å. All La(1)-Pb(1) bond lengths are 3.45 Å. Both La(1)-Sn(1) bond lengths are 3.42 Å. Both La(1)-Sn(2) bond lengths are 3.48 Å. Both La(1)-Sn(3) bond lengths are 3.41 Å. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to four equivalent La(1), two equivalent Pb(2), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form distorted PbLa4Sn6Pb2 cuboctahedra that share corners with twelve equivalent Pb(1)La4Sn6Pb2 cuboctahedra, edges with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)La4Pb8 cuboctahedra, edges with eight equivalent La(1)Sn6Pb6 cuboctahedra, faces with two equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)La4Pb8 cuboctahedra, faces with four equivalent La(1)Sn6Pb6 cuboctahedra, and faces with six equivalent Pb(1)La4Sn6Pb2 cuboctahedra. Both Pb(1)-Pb(2) bond lengths are 3.46 Å. Both Pb(1)-Sn(1) bond lengths are 3.43 Å. Both Pb(1)-Sn(2) bond lengths are 3.47 Å. Both Pb(1)-Sn(3) bond lengths are 3.44 Å. In the second Pb site, Pb(2) is bonded to four equivalent La(1), four equivalent Pb(1), and four equivalent Sn(2) atoms to form distorted PbLa4Sn4Pb4 cuboctahedra that share corners with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, edges with eight equivalent La(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)La4Sn6Pb2 cuboctahedra, faces with four equivalent La(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)La4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)La4Pb8 cuboctahedra. All Pb(2)-Sn(2) bond lengths are 3.45 Å. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Pb(1) atoms. In the second Sn site, Sn(2) is bonded to four equivalent La(1), four equivalent Pb(1), and four equivalent Pb(2) atoms to form SnLa4Pb8 cuboctahedra that share corners with four equivalent Sn(2)La4Pb8 cuboctahedra, edges with eight equivalent La(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)La4Sn6Pb2 cuboctahedra, faces with four equivalent La(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)La4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)La4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)La4Pb8 cuboctahedra. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Pb(1) atoms.