Materials Data on Cs2KNiF6 by Materials Project

Abstract

Cs2KNiF6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Cs1+ is bonded to twelve equivalent F1- atoms to form CsF12 cuboctahedra that share corners with twelve equivalent CsF12 cuboctahedra, faces with six equivalent CsF12 cuboctahedra, faces with four equivalent KF6 octahedra, and faces with four equivalent NiF6 octahedra. All Cs–F bond lengths are 3.23 Å. K1+ is bonded to six equivalent F1- atoms to form KF6 octahedra that share corners with six equivalent NiF6 octahedra and faces with eight equivalent CsF12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All K–F bond lengths are 2.61 Å. Ni3+ is bonded to six equivalent F1- atoms to form NiF6 octahedra that share corners with six equivalent KF6 octahedra and faces with eight equivalent CsF12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Ni–F bond lengths are 1.93 Å. F1- is bonded in a 2-coordinate geometry to four equivalent Cs1+, one K1+, and one Ni3+ atom.