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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Cs2TaCl6 by Materials Project

Cs2TaCl6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Cs1+ is bonded to twelve equivalent Cl1- atoms to form CsCl12 cuboctahedra that share corners with twelve equivalent CsCl12 cuboctahedra, faces with six equivalent CsCl12 cuboctahedra, and faces with four equivalent TaCl6 octahedra. All Cs–Cl bond lengths are 3.79 Å. Ta4+ is bonded to six equivalent Cl1- atoms to form TaCl6 octahedra that share faces with eight equivalent CsCl12 cuboctahedra. All Ta–Cl bond lengths are 2.43 Å. Cl1- is bonded in a distorted single-bond geometry to four equivalent Cs1+ and one Ta4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CsTaCl6 by Materials Project

CsTaCl6 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Cs1+ is bonded to twelve Cl1- atoms to form CsCl12 cuboctahedra that share corners with four equivalent CsCl12 cuboctahedra, corners with two equivalent TaCl6 octahedra, edges with four equivalent CsCl12 cuboctahedra, edges with two equivalent TaCl6 octahedra, and faces with two equivalent TaCl6 octahedra. The corner-sharing octahedral tilt angles are 46°. There are a spread of Cs–Cl bond distances ranging from 3.76–3.89 Å. Ta5+ is bonded to six Cl1- atoms to form TaCl6 octahedra that share corners with two equivalent CsCl12 cuboctahedra, edges with two equivalent CsCl12 cuboctahedra, and faces with two equivalent CsCl12 cuboctahedra. There are four shorter (2.37 Å) and two longer (2.38 Å) Ta–Cl bond lengths. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to two equivalent Cs1+ and one Ta5+ atom. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two equivalent Cs1+ and one Ta5+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to two equivalent Cs1+ and one Ta5+ atom.

36 MATERIALS SCIENCE↗