La3Te4Br crystallizes in the orthorhombic Pnma space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent Te(2), two equivalent Te(3), three equivalent Te(4), and one Br(1) atom. In the second La site, La(2) is bonded in a 8-coordinate geometry to one Te(2), two equivalent Te(1), two equivalent Te(3), two equivalent Te(4), and one Br(1) atom. In the third La site, La(3) is bonded in a 8-coordinate geometry to one Te(3), two equivalent Te(2), three equivalent Te(1), and two equivalent Br(1) atoms. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent La(2) and three equivalent La(3) atoms to form distorted TeLa5 trigonal bipyramids that share corners with two equivalent Br(1)La4 tetrahedra, corners with two equivalent Te(4)La5 trigonal bipyramids, corners with five equivalent Te(3)La5 trigonal bipyramids, corners with six equivalent Te(2)La5 trigonal bipyramids, edges with three equivalent Br(1)La4 tetrahedra,  an edgeedge with one Te(2)La5 trigonal bipyramid,  an edgeedge with one Te(3)La5 trigonal bipyramid,  an edgeedge with one Te(4)La5 trigonal bipyramid, and edges with four equivalent Te(1)La5 trigonal bipyramids. In the second Te site, Te(2) is bonded to one La(2), two equivalent La(1), and two equivalent La(3) atoms to form distorted TeLa5 trigonal bipyramids that share corners with five equivalent Br(1)La4 tetrahedra, corners with two equivalent Te(3)La5 trigonal bipyramids, corners with two equivalent Te(4)La5 trigonal bipyramids, corners with six equivalent Te(1)La5 trigonal bipyramids,  an edgeedge with one Br(1)La4 tetrahedra,  an edgeedge with one Te(1)La5 trigonal bipyramid, edges with two equivalent Te(2)La5 trigonal bipyramids, edges with three equivalent Te(3)La5 trigonal bipyramids, and edges with three equivalent Te(4)La5 trigonal bipyramids. In the third Te site, Te(3) is bonded to one La(3), two equivalent La(1), and two equivalent La(2) atoms to form distorted TeLa5 trigonal bipyramids that share corners with two equivalent Br(1)La4 tetrahedra, corners with two equivalent Te(2)La5 trigonal bipyramids, corners with five equivalent Te(1)La5 trigonal bipyramids, corners with six equivalent Te(4)La5 trigonal bipyramids, edges with two equivalent Br(1)La4 tetrahedra,  an edgeedge with one Te(1)La5 trigonal bipyramid, edges with two equivalent Te(3)La5 trigonal bipyramids, edges with two equivalent Te(4)La5 trigonal bipyramids, and edges with three equivalent Te(2)La5 trigonal bipyramids. In the fourth Te site, Te(4) is bonded to two equivalent La(2) and three equivalent La(1) atoms to form distorted TeLa5 trigonal bipyramids that share  a cornercorner with one Br(1)La4 tetrahedra, corners with two equivalent Te(1)La5 trigonal bipyramids, corners with two equivalent Te(2)La5 trigonal bipyramids, corners with six equivalent Te(3)La5 trigonal bipyramids, edges with two equivalent Br(1)La4 tetrahedra,  an edgeedge with one Te(1)La5 trigonal bipyramid, edges with two equivalent Te(3)La5 trigonal bipyramids, edges with three equivalent Te(2)La5 trigonal bipyramids, and edges with four equivalent Te(4)La5 trigonal bipyramids. Br(1) is bonded to one La(1), one La(2), and two equivalent La(3) atoms to form distorted BrLa4 tetrahedra that share corners with two equivalent Br(1)La4 tetrahedra,  a cornercorner with one Te(4)La5 trigonal bipyramid, corners with two equivalent Te(1)La5 trigonal bipyramids, corners with two equivalent Te(3)La5 trigonal bipyramids, corners with five equivalent Te(2)La5 trigonal bipyramids,  an edgeedge with one Te(2)La5 trigonal bipyramid, edges with two equivalent Te(3)La5 trigonal bipyramids, edges with two equivalent Te(4)La5 trigonal bipyramids, and edges with three equivalent Te(1)La5 trigonal bipyramids.
La3Te4Br crystallizes in the orthorhombic Pnma space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent Te(2), two equivalent Te(3), three equivalent Te(4), and one Br(1) atom. Both La(1)-Te(2) bond lengths are 3.33 Å. Both La(1)-Te(3) bond lengths are 3.42 Å. There are two shorter (3.33 Å) and one longer (3.37 Å) La(1)-Te(4) bond length. The La(1)-Br(1) bond length is 3.14 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one Te(2), two equivalent Te(1), two equivalent Te(3), two equivalent Te(4), and one Br(1) atom. The La(2)-Te(2) bond length is 3.33 Å. Both La(2)-Te(1) bond lengths are 3.38 Å. Both La(2)-Te(3) bond lengths are 3.32 Å. Both La(2)-Te(4) bond lengths are 3.36 Å. The La(2)-Br(1) bond length is 3.17 Å. In the third La site, La(3) is bonded in a 8-coordinate geometry to one Te(3), two equivalent Te(2), three equivalent Te(1), and two equivalent Br(1) atoms. The La(3)-Te(3) bond length is 3.35 Å. Both La(3)-Te(2) bond lengths are 3.35 Å. There are two shorter (3.30 Å) and one longer (3.38 Å) La(3)-Te(1) bond length. Both La(3)-Br(1) bond lengths are 3.07 Å. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent La(2) and three equivalent La(3) atoms to form distorted TeLa5 trigonal bipyramids that share corners with two equivalent Br(1)La4 tetrahedra, corners with two equivalent Te(4)La5 trigonal bipyramids, corners with five equivalent Te(3)La5 trigonal bipyramids, corners with six equivalent Te(2)La5 trigonal bipyramids, edges with three equivalent Br(1)La4 tetrahedra,  an edgeedge with one Te(2)La5 trigonal bipyramid,  an edgeedge with one Te(3)La5 trigonal bipyramid,  an edgeedge with one Te(4)La5 trigonal bipyramid, and edges with four equivalent Te(1)La5 trigonal bipyramids. In the second Te site, Te(2) is bonded to one La(2), two equivalent La(1), and two equivalent La(3) atoms to form distorted TeLa5 trigonal bipyramids that share corners with five equivalent Br(1)La4 tetrahedra, corners with two equivalent Te(3)La5 trigonal bipyramids, corners with two equivalent Te(4)La5 trigonal bipyramids, corners with six equivalent Te(1)La5 trigonal bipyramids,  an edgeedge with one Br(1)La4 tetrahedra,  an edgeedge with one Te(1)La5 trigonal bipyramid, edges with two equivalent Te(2)La5 trigonal bipyramids, edges with three equivalent Te(3)La5 trigonal bipyramids, and edges with three equivalent Te(4)La5 trigonal bipyramids. In the third Te site, Te(3) is bonded to one La(3), two equivalent La(1), and two equivalent La(2) atoms to form distorted TeLa5 trigonal bipyramids that share corners with two equivalent Br(1)La4 tetrahedra, corners with two equivalent Te(2)La5 trigonal bipyramids, corners with five equivalent Te(1)La5 trigonal bipyramids, corners with six equivalent Te(4)La5 trigonal bipyramids, edges with two equivalent Br(1)La4 tetrahedra,  an edgeedge with one Te(1)La5 trigonal bipyramid, edges with two equivalent Te(3)La5 trigonal bipyramids, edges with two equivalent Te(4)La5 trigonal bipyramids, and edges with three equivalent Te(2)La5 trigonal bipyramids. In the fourth Te site, Te(4) is bonded to two equivalent La(2) and three equivalent La(1) atoms to form distorted TeLa5 trigonal bipyramids that share  a cornercorner with one Br(1)La4 tetrahedra, corners with two equivalent Te(1)La5 trigonal bipyramids, corners with two equivalent Te(2)La5 trigonal bipyramids, corners with six equivalent Te(3)La5 trigonal bipyramids, edges with two equivalent Br(1)La4 tetrahedra,  an edgeedge with one Te(1)La5 trigonal bipyramid, edges with two equivalent Te(3)La5 trigonal bipyramids, edges with three equivalent Te(2)La5 trigonal bipyramids, and edges with four equivalent Te(4)La5 trigonal bipyramids. Br(1) is bonded to one La(1), one La(2), and two equivalent La(3) atoms to form distorted BrLa4 tetrahedra that share corners with two equivalent Br(1)La4 tetrahedra,  a cornercorner with one Te(4)La5 trigonal bipyramid, corners with two equivalent Te(1)La5 trigonal bipyramids, corners with two equivalent Te(3)La5 trigonal bipyramids, corners with five equivalent Te(2)La5 trigonal bipyramids,  an edgeedge with one Te(2)La5 trigonal bipyramid, edges with two equivalent Te(3)La5 trigonal bipyramids, edges with two equivalent Te(4)La5 trigonal bipyramids, and edges with three equivalent Te(1)La5 trigonal bipyramids.