RbTlF3 is (Cubic) Perovskite-like structured and crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent F(1) atoms to form RbF12 cuboctahedra that share corners with twelve equivalent Rb(1)F12 cuboctahedra, faces with six equivalent Rb(1)F12 cuboctahedra, faces with four equivalent Tl(1)F6 octahedra, and faces with four equivalent Tl(2)F6 octahedra. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded to six equivalent F(1) atoms to form TlF6 octahedra that share corners with six equivalent Tl(2)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. In the second Tl site, Tl(2) is bonded to six equivalent F(1) atoms to form TlF6 octahedra that share corners with six equivalent Tl(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. F(1) is bonded in a distorted linear geometry to four equivalent Rb(1), one Tl(1), and one Tl(2) atom.
RbTlF3 is (Cubic) Perovskite-like structured and crystallizes in the cubic Fm-3m space group. Rb(1) is bonded to twelve equivalent F(1) atoms to form RbF12 cuboctahedra that share corners with twelve equivalent Rb(1)F12 cuboctahedra, faces with six equivalent Rb(1)F12 cuboctahedra, faces with four equivalent Tl(1)F6 octahedra, and faces with four equivalent Tl(2)F6 octahedra. All Rb(1)-F(1) bond lengths are 3.35 Å. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded to six equivalent F(1) atoms to form TlF6 octahedra that share corners with six equivalent Tl(2)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Tl(1)-F(1) bond lengths are 2.56 Å. In the second Tl site, Tl(2) is bonded to six equivalent F(1) atoms to form TlF6 octahedra that share corners with six equivalent Tl(1)F6 octahedra and faces with eight equivalent Rb(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. All Tl(2)-F(1) bond lengths are 2.17 Å. F(1) is bonded in a distorted linear geometry to four equivalent Rb(1), one Tl(1), and one Tl(2) atom.