DOI: 10.17188/1654361
title: Materials Data on Ba4Re2NiO12 by Materials Project

description: Ba4Re2NiO12 crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with nine BaO12 cuboctahedra, corners with three equivalent ReO6 octahedra, faces with seven BaO12 cuboctahedra, a faceface with one NiO6 octahedra, and faces with three equivalent ReO6 octahedra. The corner-sharing octahedral tilt angles are 22°. There are a spread of Ba–O bond distances ranging from 2.91–3.05 Å. In the second Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with nine BaO12 cuboctahedra, corners with three equivalent ReO6 octahedra, faces with seven BaO12 cuboctahedra, faces with three equivalent ReO6 octahedra, and faces with three equivalent NiO6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are a spread of Ba–O bond distances ranging from 2.93–3.01 Å. In the third Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with nine BaO12 cuboctahedra, faces with seven BaO12 cuboctahedra, faces with three equivalent NiO6 octahedra, and faces with four ReO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.90–2.93 Å. In the fourth Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with nine BaO12 cuboctahedra, corners with three equivalent NiO6 octahedra, faces with seven BaO12 cuboctahedra, and faces with four ReO6 octahedra. The corner-sharing octahedral tilt angles are 6°. There are a spread of Ba–O bond distances ranging from 2.90–2.98 Å. There are two inequivalent Re7+ sites. In the first Re7+ site, Re7+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with three equivalent NiO6 octahedra and faces with eight BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 6°. There is three shorter (1.84 Å) and three longer (1.97 Å) Re–O bond length. In the second Re7+ site, Re7+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with six BaO12 cuboctahedra, faces with six BaO12 cuboctahedra, and a faceface with one NiO6 octahedra. There is three shorter (1.84 Å) and three longer (1.99 Å) Re–O bond length. Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three equivalent BaO12 cuboctahedra, corners with three equivalent ReO6 octahedra, faces with seven BaO12 cuboctahedra, and a faceface with one ReO6 octahedra. The corner-sharing octahedral tilt angles are 6°. There are three shorter (2.07 Å) and three longer (2.12 Å) Ni–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Re7+, and one Ni2+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to four Ba2+ and one Re7+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to four Ba2+ and one Re7+ atom. In the fourth O2- site, O2- is bonded in a distorted linear geometry to four Ba2+, one Re7+, and one Ni2+ atom.