Materials Data on K2NaTlI6 by Materials Project
K2NaTlI6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. K1+ is bonded to twelve equivalent I1- atoms to form distorted KI12 cuboctahedra that share corners with twelve equivalent KI12 cuboctahedra, faces with six equivalent KI12 cuboctahedra, faces with four equivalent NaI6 octahedra, and faces with four equivalent TlI6 octahedra. All K–I bond lengths are 4.34 Å. Na1+ is bonded to six equivalent I1- atoms to form NaI6 octahedra that share corners with six equivalent TlI6 octahedra and faces with eight equivalent KI12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Na–I bond lengths are 3.13 Å. Tl3+ is bonded to six equivalent I1- atoms to form TlI6 octahedra that share corners with six equivalent NaI6 octahedra and faces with eight equivalent KI12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Tl–I bond lengths are 3.01 Å. I1- is bonded in a linear geometry to four equivalent K1+, one Na1+, and one Tl3+ atom.