Materials Data on Ba5Sb4 by Materials Project

Ba5Sb4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are three inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to six Sb+2.50- atoms to form a mixture of distorted face, edge, and corner-sharing BaSb6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 38–46°. There are a spread of Ba–Sb bond distances ranging from 3.52–3.87 Å. In the second Ba2+ site, Ba2+ is bonded to six Sb+2.50- atoms to form a mixture of distorted face, edge, and corner-sharing BaSb6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 37–45°. There are a spread of Ba–Sb bond distances ranging from 3.52–3.91 Å. In the third Ba2+ site, Ba2+ is bonded to six Sb+2.50- atoms to form a mixture of face and corner-sharing BaSb6 octahedra. The corner-sharing octahedra tilt angles range from 57–58°. There are a spread of Ba–Sb bond distances ranging from 3.57–3.72 Å. There are three inequivalent Sb+2.50- sites. In the first Sb+2.50- site, Sb+2.50- is bonded in a 9-coordinate geometry to eight Ba2+ and one Sb+2.50- atom. The Sb–Sb bond length is 2.93 Å. In the second Sb+2.50- site, Sb+2.50- is bonded to seven Ba2+ atoms to form a mixture of distorted edge and corner-sharing SbBa7 pentagonal bipyramids. In the third Sb+2.50- site, Sb+2.50- is bonded in a 9-coordinate geometry to eight Ba2+ and one Sb+2.50- atom.