Materials Data on CsMgI3 by Materials Project
CsMgI3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cs1+ is bonded to twelve equivalent I1- atoms to form CsI12 cuboctahedra that share corners with six equivalent CsI12 cuboctahedra, corners with six equivalent MgI6 octahedra, faces with eight equivalent CsI12 cuboctahedra, and faces with six equivalent MgI6 octahedra. The corner-sharing octahedral tilt angles are 18°. There are six shorter (4.19 Å) and six longer (4.34 Å) Cs–I bond lengths. Mg2+ is bonded to six equivalent I1- atoms to form MgI6 octahedra that share corners with six equivalent CsI12 cuboctahedra, faces with six equivalent CsI12 cuboctahedra, and faces with two equivalent MgI6 octahedra. All Mg–I bond lengths are 2.95 Å. I1- is bonded in a 6-coordinate geometry to four equivalent Cs1+ and two equivalent Mg2+ atoms.