Materials Data on CsCaTa6Cl18 by Materials Project

Abstract

CsCaTa6Cl18 crystallizes in the trigonal P-31c space group. The structure is three-dimensional. Cs is bonded in a 12-coordinate geometry to twelve Cl atoms. There are six shorter (3.86 Å) and six longer (3.97 Å) Cs–Cl bond lengths. Ca is bonded to six equivalent Cl atoms to form CaCl6 octahedra that share corners with six equivalent TaCl5 square pyramids. All Ca–Cl bond lengths are 2.82 Å. Ta is bonded to five Cl atoms to form distorted TaCl5 square pyramids that share a cornercorner with one CaCl6 octahedra and corners with four equivalent TaCl5 square pyramids. The corner-sharing octahedral tilt angles are 45°. There are four shorter (2.45 Å) and one longer (2.62 Å) Ta–Cl bond lengths. There are three inequivalent Cl sites. In the first Cl site, Cl is bonded in a 2-coordinate geometry to two equivalent Ta atoms. In the second Cl site, Cl is bonded in a 3-coordinate geometry to one Cs, one Ca, and one Ta atom. In the third Cl site, Cl is bonded in a 2-coordinate geometry to one Cs and two equivalent Ta atoms.