Materials Data on Ba9Pr6Br34 by Materials Project

Abstract

Ba9Pr6Br34 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded in a body-centered cubic geometry to eight equivalent Br atoms. All Ba–Br bond lengths are 3.31 Å. In the second Ba site, Ba is bonded in a 10-coordinate geometry to ten Br atoms. There are a spread of Ba–Br bond distances ranging from 3.31–3.80 Å. There are two inequivalent Pr sites. In the first Pr site, Pr is bonded in a 8-coordinate geometry to eight Br atoms. All Pr–Br bond lengths are 3.08 Å. In the second Pr site, Pr is bonded in a 8-coordinate geometry to eight Br atoms. There are a spread of Pr–Br bond distances ranging from 3.00–3.15 Å. There are six inequivalent Br sites. In the first Br site, Br is bonded to four equivalent Ba atoms to form a mixture of edge and corner-sharing BrBa4 tetrahedra. In the second Br site, Br is bonded to three Ba and one Pr atom to form BrBa3Pr tetrahedra that share corners with twelve BrBa4 tetrahedra and edges with five BrBa3Pr tetrahedra. In the third Br site, Br is bonded to three equivalent Ba and one Pr atom to form a mixture of edge and corner-sharing BrBa3Pr tetrahedra. In the fourth Br site, Br is bonded in a distorted bent 150 degrees geometry to two equivalent Ba and two equivalent Pr atoms. In the fifth Br site, Br is bonded in a 4-coordinate geometry to two equivalent Ba and two Pr atoms. In the sixth Br site, Br is bonded to two equivalent Ba and two equivalent Pr atoms to form BrBa2Pr2 tetrahedra that share corners with ten BrBa3Pr tetrahedra and edges with four BrBa4 tetrahedra.