Materials Data on KTmI3 by Materials Project
KTmI3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. K is bonded in a 8-coordinate geometry to eight I atoms. There are six shorter (3.60 Å) and two longer (3.96 Å) K–I bond lengths. Tm is bonded to six I atoms to form a mixture of edge and corner-sharing TmI6 octahedra. The corner-sharing octahedral tilt angles are 40°. There are four shorter (3.06 Å) and two longer (3.07 Å) Tm–I bond lengths. There are two inequivalent I sites. In the first I site, I is bonded in a 5-coordinate geometry to three equivalent K and two equivalent Tm atoms. In the second I site, I is bonded to two equivalent K and two equivalent Tm atoms to form distorted corner-sharing IK2Tm2 tetrahedra.
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