Materials Data on KSb4F13 by Materials Project
KSb4F13 crystallizes in the tetragonal I4/m space group. The structure is one-dimensional and consists of two KSb4F13 ribbons oriented in the (0, 0, 1) direction. K1+ is bonded in a distorted q6 geometry to ten F1- atoms. There are eight shorter (2.81 Å) and two longer (2.98 Å) K–F bond lengths. Sb3+ is bonded in a 3-coordinate geometry to four F1- atoms. There are a spread of Sb–F bond distances ranging from 1.96–2.75 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 120 degrees geometry to one K1+, one Sb3+, and one F1- atom. The F–F bond length is 2.75 Å. In the second F1- site, F1- is bonded in a single-bond geometry to one Sb3+ atom. In the third F1- site, F1- is bonded to two equivalent K1+, four equivalent Sb3+, and eight equivalent F1- atoms to form distorted corner-sharing FK2Sb4F8 octahedra. The corner-sharing octahedral tilt angles are 0°.