La8(BiSb)3 crystallizes in the monoclinic C2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. In the second La site, La(2) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. In the third La site, La(3) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. In the fourth La site, La(4) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted BiLa8 hexagonal bipyramids that share corners with two equivalent Bi(2)La8 hexagonal bipyramids, corners with two equivalent Sb(1)La8 hexagonal bipyramids, corners with four equivalent Sb(2)La8 hexagonal bipyramids, edges with four equivalent Bi(1)La8 hexagonal bipyramids, faces with two equivalent Bi(2)La8 hexagonal bipyramids, faces with two equivalent Sb(1)La8 hexagonal bipyramids, and faces with four equivalent Sb(2)La8 hexagonal bipyramids. In the second Bi site, Bi(2) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted BiLa8 hexagonal bipyramids that share corners with four equivalent Bi(1)La8 hexagonal bipyramids, corners with four equivalent Sb(2)La8 hexagonal bipyramids, edges with four equivalent Sb(1)La8 hexagonal bipyramids, faces with four equivalent Bi(1)La8 hexagonal bipyramids, and faces with four equivalent Sb(2)La8 hexagonal bipyramids. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted SbLa8 hexagonal bipyramids that share corners with four equivalent Bi(1)La8 hexagonal bipyramids, corners with four equivalent Sb(2)La8 hexagonal bipyramids, edges with four equivalent Bi(2)La8 hexagonal bipyramids, faces with four equivalent Bi(1)La8 hexagonal bipyramids, and faces with four equivalent Sb(2)La8 hexagonal bipyramids. In the second Sb site, Sb(2) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted SbLa8 hexagonal bipyramids that share corners with two equivalent Bi(2)La8 hexagonal bipyramids, corners with two equivalent Sb(1)La8 hexagonal bipyramids, corners with four equivalent Bi(1)La8 hexagonal bipyramids, edges with four equivalent Sb(2)La8 hexagonal bipyramids, faces with two equivalent Bi(2)La8 hexagonal bipyramids, faces with two equivalent Sb(1)La8 hexagonal bipyramids, and faces with four equivalent Bi(1)La8 hexagonal bipyramids.
La8(BiSb)3 crystallizes in the monoclinic C2 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. The La(1)-Bi(2) bond length is 3.30 Å. There is one shorter (3.29 Å) and one longer (3.55 Å) La(1)-Bi(1) bond length. The La(1)-Sb(1) bond length is 3.50 Å. There is one shorter (3.23 Å) and one longer (3.51 Å) La(1)-Sb(2) bond length. In the second La site, La(2) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. The La(2)-Bi(2) bond length is 3.55 Å. There is one shorter (3.28 Å) and one longer (3.53 Å) La(2)-Bi(1) bond length. The La(2)-Sb(1) bond length is 3.25 Å. There is one shorter (3.23 Å) and one longer (3.54 Å) La(2)-Sb(2) bond length. In the third La site, La(3) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. The La(3)-Bi(2) bond length is 3.28 Å. There is one shorter (3.30 Å) and one longer (3.52 Å) La(3)-Bi(1) bond length. The La(3)-Sb(1) bond length is 3.51 Å. There is one shorter (3.24 Å) and one longer (3.53 Å) La(3)-Sb(2) bond length. In the fourth La site, La(4) is bonded in a 6-coordinate geometry to one Bi(2), two equivalent Bi(1), one Sb(1), and two equivalent Sb(2) atoms. The La(4)-Bi(2) bond length is 3.55 Å. There is one shorter (3.29 Å) and one longer (3.55 Å) La(4)-Bi(1) bond length. The La(4)-Sb(1) bond length is 3.23 Å. There is one shorter (3.23 Å) and one longer (3.51 Å) La(4)-Sb(2) bond length. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted BiLa8 hexagonal bipyramids that share corners with two equivalent Bi(2)La8 hexagonal bipyramids, corners with two equivalent Sb(1)La8 hexagonal bipyramids, corners with four equivalent Sb(2)La8 hexagonal bipyramids, edges with four equivalent Bi(1)La8 hexagonal bipyramids, faces with two equivalent Bi(2)La8 hexagonal bipyramids, faces with two equivalent Sb(1)La8 hexagonal bipyramids, and faces with four equivalent Sb(2)La8 hexagonal bipyramids. In the second Bi site, Bi(2) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted BiLa8 hexagonal bipyramids that share corners with four equivalent Bi(1)La8 hexagonal bipyramids, corners with four equivalent Sb(2)La8 hexagonal bipyramids, edges with four equivalent Sb(1)La8 hexagonal bipyramids, faces with four equivalent Bi(1)La8 hexagonal bipyramids, and faces with four equivalent Sb(2)La8 hexagonal bipyramids. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted SbLa8 hexagonal bipyramids that share corners with four equivalent Bi(1)La8 hexagonal bipyramids, corners with four equivalent Sb(2)La8 hexagonal bipyramids, edges with four equivalent Bi(2)La8 hexagonal bipyramids, faces with four equivalent Bi(1)La8 hexagonal bipyramids, and faces with four equivalent Sb(2)La8 hexagonal bipyramids. In the second Sb site, Sb(2) is bonded to two equivalent La(1), two equivalent La(2), two equivalent La(3), and two equivalent La(4) atoms to form distorted SbLa8 hexagonal bipyramids that share corners with two equivalent Bi(2)La8 hexagonal bipyramids, corners with two equivalent Sb(1)La8 hexagonal bipyramids, corners with four equivalent Bi(1)La8 hexagonal bipyramids, edges with four equivalent Sb(2)La8 hexagonal bipyramids, faces with two equivalent Bi(2)La8 hexagonal bipyramids, faces with two equivalent Sb(1)La8 hexagonal bipyramids, and faces with four equivalent Bi(1)La8 hexagonal bipyramids.