Ba9In4 crystallizes in the tetragonal I4/m space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a square co-planar geometry to four equivalent In(1) atoms. In the second Ba site, Ba(2) is bonded in a 3-coordinate geometry to three equivalent In(1) atoms. In the third Ba site, Ba(3) is bonded in a distorted trigonal planar geometry to three equivalent In(1) atoms. In(1) is bonded in a 7-coordinate geometry to one Ba(1), three equivalent Ba(2), and three equivalent Ba(3) atoms.
Ba9In4 crystallizes in the tetragonal I4/m space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a square co-planar geometry to four equivalent In(1) atoms. All Ba(1)-In(1) bond lengths are 3.65 Å. In the second Ba site, Ba(2) is bonded in a 3-coordinate geometry to three equivalent In(1) atoms. There is one shorter (3.72 Å) and two longer (3.73 Å) Ba(2)-In(1) bond lengths. In the third Ba site, Ba(3) is bonded in a distorted trigonal planar geometry to three equivalent In(1) atoms. There is one shorter (3.57 Å) and two longer (3.68 Å) Ba(3)-In(1) bond lengths. In(1) is bonded in a 7-coordinate geometry to one Ba(1), three equivalent Ba(2), and three equivalent Ba(3) atoms.