BaRuO5 crystallizes in the trigonal R-3c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to six equivalent O(2) and six equivalent O(3) atoms to form BaO12 cuboctahedra that share edges with six equivalent Ru(1)O5 trigonal bipyramids. In the second Ba site, Ba(2) is bonded in a distorted q6 geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. Ru(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form RuO5 trigonal bipyramids that share edges with two equivalent Ba(1)O12 cuboctahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Ba(2) and one Ru(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Ru(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ru(1) atom.
BaRuO5 crystallizes in the trigonal R-3c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to six equivalent O(2) and six equivalent O(3) atoms to form BaO12 cuboctahedra that share edges with six equivalent Ru(1)O5 trigonal bipyramids. All Ba(1)-O(2) bond lengths are 2.93 Å. All Ba(1)-O(3) bond lengths are 2.75 Å. In the second Ba site, Ba(2) is bonded in a distorted q6 geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. All Ba(2)-O(1) bond lengths are 2.80 Å. All Ba(2)-O(2) bond lengths are 2.86 Å. All Ba(2)-O(3) bond lengths are 2.72 Å. Ru(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form RuO5 trigonal bipyramids that share edges with two equivalent Ba(1)O12 cuboctahedra. The Ru(1)-O(1) bond length is 1.76 Å. Both Ru(1)-O(2) bond lengths are 1.76 Å. Both Ru(1)-O(3) bond lengths are 1.80 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Ba(2) and one Ru(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Ru(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ru(1) atom.