Tl9LaTe6 crystallizes in the tetragonal I4/m space group. La(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form LaTe6 octahedra that share corners with six equivalent Tl(2)Te6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 1-coordinate geometry to three equivalent Te(1) atoms. In the second Tl site, Tl(2) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form TlTe6 octahedra that share corners with six equivalent La(1)Te6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to one La(1), one Tl(2), and six equivalent Tl(1) atoms. In the second Te site, Te(2) is bonded in a distorted single-bond geometry to one La(1) and one Tl(2) atom.
Tl9LaTe6 crystallizes in the tetragonal I4/m space group. La(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form LaTe6 octahedra that share corners with six equivalent Tl(2)Te6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. Both La(1)-Te(2) bond lengths are 3.23 Å. All La(1)-Te(1) bond lengths are 3.27 Å. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 1-coordinate geometry to three equivalent Te(1) atoms. There are a spread of Tl(1)-Te(1) bond distances ranging from 3.24-3.57 Å. In the second Tl site, Tl(2) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form TlTe6 octahedra that share corners with six equivalent La(1)Te6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. Both Tl(2)-Te(2) bond lengths are 3.51 Å. All Tl(2)-Te(1) bond lengths are 3.50 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to one La(1), one Tl(2), and six equivalent Tl(1) atoms. In the second Te site, Te(2) is bonded in a distorted single-bond geometry to one La(1) and one Tl(2) atom.