Ba10Cu5O17 crystallizes in the triclinic P-1 space group. There are five inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(2), one O(3), one O(9), two equivalent O(1), and two equivalent O(8) atoms to form distorted BaO7 pentagonal bipyramids that share corners with two equivalent Ba(1)O7 pentagonal bipyramids,  a cornercorner with one Cu(2)O5 square pyramid,  an edgeedge with one Ba(1)O7 pentagonal bipyramid, and edges with two equivalent Cu(1)O5 square pyramids. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(1), one O(5), one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), one O(9), and two equivalent O(3) atoms. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to one O(3), one O(5), one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms. In the fifth Ba site, Ba(5) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(8), and three equivalent O(9) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form distorted CuO5 square pyramids that share corners with two equivalent Cu(2)O5 square pyramids and edges with two equivalent Ba(1)O7 pentagonal bipyramids. In the second Cu site, Cu(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CuO5 square pyramids that share  a cornercorner with one Ba(1)O7 pentagonal bipyramid,  a cornercorner with one Cu(2)O5 square pyramid, and corners with two equivalent Cu(1)O5 square pyramids. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(8) atoms. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Ba(2), one Ba(3), one Ba(5), two equivalent Ba(1), and one Cu(3) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(3)Ba5Cu octahedra,  a cornercorner with one O(4)Ba5Cu octahedra, corners with two equivalent O(8)Ba4Cu2 octahedra, corners with three equivalent O(5)Ba4Cu2 octahedra, corners with three equivalent O(6)Ba4Cu2 octahedra, corners with three equivalent O(1)Ba5Cu octahedra,  an edgeedge with one O(4)Ba5Cu octahedra, edges with two equivalent O(2)Ba5Cu octahedra, edges with two equivalent O(3)Ba5Cu octahedra, edges with three equivalent O(9)Ba5Cu octahedra, and faces with two equivalent O(8)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the second O site, O(2) is bonded to one Ba(1), two equivalent Ba(2), two equivalent Ba(4), and one Cu(1) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(3)Ba5Cu octahedra, corners with two equivalent O(5)Ba4Cu2 octahedra, corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(7)Ba4Cu2 octahedra, corners with two equivalent O(8)Ba4Cu2 octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra,  an edgeedge with one O(2)Ba5Cu octahedra,  an edgeedge with one O(3)Ba5Cu octahedra, edges with two equivalent O(1)Ba5Cu octahedra, edges with four equivalent O(4)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(8)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-67°. In the third O site, O(3) is bonded to one Ba(1), one Ba(4), one Ba(5), two equivalent Ba(3), and one Cu(2) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(1)Ba5Cu octahedra,  a cornercorner with one O(2)Ba5Cu octahedra,  a cornercorner with one O(4)Ba5Cu octahedra, corners with two equivalent O(5)Ba4Cu2 octahedra, corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with three equivalent O(8)Ba4Cu2 octahedra,  an edgeedge with one O(2)Ba5Cu octahedra, edges with two equivalent O(1)Ba5Cu octahedra, edges with two equivalent O(4)Ba5Cu octahedra, edges with three equivalent O(9)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(7)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the fourth O site, O(4) is bonded to one Ba(3), two equivalent Ba(2), two equivalent Ba(4), and one Cu(2) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(1)Ba5Cu octahedra,  a cornercorner with one O(3)Ba5Cu octahedra,  a cornercorner with one O(9)Ba5Cu octahedra, corners with two equivalent O(8)Ba4Cu2 octahedra, corners with two equivalent O(4)Ba5Cu octahedra, corners with three equivalent O(5)Ba4Cu2 octahedra, corners with three equivalent O(6)Ba4Cu2 octahedra,  an edgeedge with one O(1)Ba5Cu octahedra,  an edgeedge with one O(4)Ba5Cu octahedra, edges with two equivalent O(3)Ba5Cu octahedra, edges with four equivalent O(2)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(7)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the fifth O site, O(5) is bonded to one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Cu(1), and one Cu(2) atom to form distorted OBa4Cu2 octahedra that share corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with three equivalent O(1)Ba5Cu octahedra, corners with three equivalent O(4)Ba5Cu octahedra,  a faceface with one O(7)Ba4Cu2 octahedra,  a faceface with one O(8)Ba4Cu2 octahedra,  a faceface with one O(2)Ba5Cu octahedra,  a faceface with one O(3)Ba5Cu octahedra,  a faceface with one O(4)Ba5Cu octahedra,  a faceface with one O(9)Ba5Cu octahedra, and faces with two equivalent O(6)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. In the sixth O site, O(6) is bonded to one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Cu(1), and one Cu(2) atom to form distorted OBa4Cu2 octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(8)Ba4Cu2 octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with three equivalent O(1)Ba5Cu octahedra, corners with three equivalent O(4)Ba5Cu octahedra,  an edgeedge with one O(7)Ba4Cu2 octahedra,  an edgeedge with one O(8)Ba4Cu2 octahedra,  a faceface with one O(2)Ba5Cu octahedra,  a faceface with one O(3)Ba5Cu octahedra,  a faceface with one O(4)Ba5Cu octahedra,  a faceface with one O(9)Ba5Cu octahedra, and faces with two equivalent O(5)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-64°. In the seventh O site, O(7) is bonded to two equivalent Ba(3), two equivalent Ba(4), and two equivalent Cu(2) atoms to form OBa4Cu2 octahedra that share corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(1)Ba5Cu octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with two equivalent O(4)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with four equivalent O(2)Ba5Cu octahedra, edges with two equivalent O(6)Ba4Cu2 octahedra, faces with two equivalent O(5)Ba4Cu2 octahedra, faces with two equivalent O(3)Ba5Cu octahedra, and faces with two equivalent O(4)Ba5Cu octahedra. The corner-sharing octahedral tilt angles range from 3-61°. In the eighth O site, O(8) is bonded to one Ba(2), one Ba(5), two equivalent Ba(1), one Cu(1), and one Cu(3) atom to form distorted OBa4Cu2 octahedra that share  a cornercorner with one O(6)Ba4Cu2 octahedra,  a cornercorner with one O(8)Ba4Cu2 octahedra, corners with two equivalent O(1)Ba5Cu octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(4)Ba5Cu octahedra, corners with three equivalent O(3)Ba5Cu octahedra, corners with three equivalent O(9)Ba5Cu octahedra,  an edgeedge with one O(6)Ba4Cu2 octahedra,  an edgeedge with one O(8)Ba4Cu2 octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(2)Ba5Cu octahedra,  a faceface with one O(9)Ba5Cu octahedra, and faces with two equivalent O(1)Ba5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-67°. In the ninth O site, O(9) is bonded to one Ba(1), one Ba(3), three equivalent Ba(5), and one Cu(1) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(4)Ba5Cu octahedra, corners with two equivalent O(5)Ba4Cu2 octahedra, corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with three equivalent O(8)Ba4Cu2 octahedra, edges with two equivalent O(9)Ba5Cu octahedra, edges with three equivalent O(1)Ba5Cu octahedra, edges with three equivalent O(3)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(8)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-67°.
Ba10Cu5O17 crystallizes in the triclinic P-1 space group. There are five inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(2), one O(3), one O(9), two equivalent O(1), and two equivalent O(8) atoms to form distorted BaO7 pentagonal bipyramids that share corners with two equivalent Ba(1)O7 pentagonal bipyramids,  a cornercorner with one Cu(2)O5 square pyramid,  an edgeedge with one Ba(1)O7 pentagonal bipyramid, and edges with two equivalent Cu(1)O5 square pyramids. The Ba(1)-O(2) bond length is 2.77 Å. The Ba(1)-O(3) bond length is 2.67 Å. The Ba(1)-O(9) bond length is 2.79 Å. There is one shorter (2.87 Å) and one longer (2.88 Å) Ba(1)-O(1) bond length. There is one shorter (2.68 Å) and one longer (2.70 Å) Ba(1)-O(8) bond length. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(1), one O(5), one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms. The Ba(2)-O(1) bond length is 2.90 Å. The Ba(2)-O(5) bond length is 2.70 Å. The Ba(2)-O(6) bond length is 2.76 Å. The Ba(2)-O(8) bond length is 2.75 Å. There is one shorter (2.79 Å) and one longer (2.96 Å) Ba(2)-O(2) bond length. There is one shorter (2.71 Å) and one longer (2.93 Å) Ba(2)-O(4) bond length. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), one O(9), and two equivalent O(3) atoms. The Ba(3)-O(1) bond length is 2.72 Å. The Ba(3)-O(4) bond length is 2.80 Å. The Ba(3)-O(5) bond length is 2.75 Å. The Ba(3)-O(6) bond length is 2.73 Å. The Ba(3)-O(7) bond length is 2.72 Å. The Ba(3)-O(9) bond length is 2.94 Å. There is one shorter (2.83 Å) and one longer (2.92 Å) Ba(3)-O(3) bond length. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to one O(3), one O(5), one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms. The Ba(4)-O(3) bond length is 2.80 Å. The Ba(4)-O(5) bond length is 2.73 Å. The Ba(4)-O(6) bond length is 2.74 Å. The Ba(4)-O(7) bond length is 2.70 Å. There is one shorter (2.76 Å) and one longer (2.92 Å) Ba(4)-O(2) bond length. There is one shorter (2.84 Å) and one longer (2.91 Å) Ba(4)-O(4) bond length. In the fifth Ba site, Ba(5) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(8), and three equivalent O(9) atoms. The Ba(5)-O(1) bond length is 2.89 Å. The Ba(5)-O(3) bond length is 2.92 Å. The Ba(5)-O(5) bond length is 2.71 Å. The Ba(5)-O(6) bond length is 2.72 Å. The Ba(5)-O(8) bond length is 2.77 Å. There are a spread of Ba(5)-O(9) bond distances ranging from 2.75-2.96 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form distorted CuO5 square pyramids that share corners with two equivalent Cu(2)O5 square pyramids and edges with two equivalent Ba(1)O7 pentagonal bipyramids. The Cu(1)-O(2) bond length is 1.88 Å. The Cu(1)-O(5) bond length is 1.90 Å. The Cu(1)-O(6) bond length is 2.10 Å. The Cu(1)-O(8) bond length is 2.39 Å. The Cu(1)-O(9) bond length is 1.88 Å. In the second Cu site, Cu(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CuO5 square pyramids that share  a cornercorner with one Ba(1)O7 pentagonal bipyramid,  a cornercorner with one Cu(2)O5 square pyramid, and corners with two equivalent Cu(1)O5 square pyramids. The Cu(2)-O(3) bond length is 1.91 Å. The Cu(2)-O(4) bond length is 1.92 Å. The Cu(2)-O(5) bond length is 2.02 Å. The Cu(2)-O(6) bond length is 1.93 Å. The Cu(2)-O(7) bond length is 2.04 Å. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(8) atoms. Both Cu(3)-O(1) bond lengths are 1.88 Å. Both Cu(3)-O(8) bond lengths are 1.85 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded to one Ba(2), one Ba(3), one Ba(5), two equivalent Ba(1), and one Cu(3) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(3)Ba5Cu octahedra,  a cornercorner with one O(4)Ba5Cu octahedra, corners with two equivalent O(8)Ba4Cu2 octahedra, corners with three equivalent O(5)Ba4Cu2 octahedra, corners with three equivalent O(6)Ba4Cu2 octahedra, corners with three equivalent O(1)Ba5Cu octahedra,  an edgeedge with one O(4)Ba5Cu octahedra, edges with two equivalent O(2)Ba5Cu octahedra, edges with two equivalent O(3)Ba5Cu octahedra, edges with three equivalent O(9)Ba5Cu octahedra, and faces with two equivalent O(8)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the second O site, O(2) is bonded to one Ba(1), two equivalent Ba(2), two equivalent Ba(4), and one Cu(1) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(3)Ba5Cu octahedra, corners with two equivalent O(5)Ba4Cu2 octahedra, corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(7)Ba4Cu2 octahedra, corners with two equivalent O(8)Ba4Cu2 octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra,  an edgeedge with one O(2)Ba5Cu octahedra,  an edgeedge with one O(3)Ba5Cu octahedra, edges with two equivalent O(1)Ba5Cu octahedra, edges with four equivalent O(4)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(8)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-67°. In the third O site, O(3) is bonded to one Ba(1), one Ba(4), one Ba(5), two equivalent Ba(3), and one Cu(2) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(1)Ba5Cu octahedra,  a cornercorner with one O(2)Ba5Cu octahedra,  a cornercorner with one O(4)Ba5Cu octahedra, corners with two equivalent O(5)Ba4Cu2 octahedra, corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with three equivalent O(8)Ba4Cu2 octahedra,  an edgeedge with one O(2)Ba5Cu octahedra, edges with two equivalent O(1)Ba5Cu octahedra, edges with two equivalent O(4)Ba5Cu octahedra, edges with three equivalent O(9)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(7)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the fourth O site, O(4) is bonded to one Ba(3), two equivalent Ba(2), two equivalent Ba(4), and one Cu(2) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(1)Ba5Cu octahedra,  a cornercorner with one O(3)Ba5Cu octahedra,  a cornercorner with one O(9)Ba5Cu octahedra, corners with two equivalent O(8)Ba4Cu2 octahedra, corners with two equivalent O(4)Ba5Cu octahedra, corners with three equivalent O(5)Ba4Cu2 octahedra, corners with three equivalent O(6)Ba4Cu2 octahedra,  an edgeedge with one O(1)Ba5Cu octahedra,  an edgeedge with one O(4)Ba5Cu octahedra, edges with two equivalent O(3)Ba5Cu octahedra, edges with four equivalent O(2)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(7)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 5-64°. In the fifth O site, O(5) is bonded to one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Cu(1), and one Cu(2) atom to form distorted OBa4Cu2 octahedra that share corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with three equivalent O(1)Ba5Cu octahedra, corners with three equivalent O(4)Ba5Cu octahedra,  a faceface with one O(7)Ba4Cu2 octahedra,  a faceface with one O(8)Ba4Cu2 octahedra,  a faceface with one O(2)Ba5Cu octahedra,  a faceface with one O(3)Ba5Cu octahedra,  a faceface with one O(4)Ba5Cu octahedra,  a faceface with one O(9)Ba5Cu octahedra, and faces with two equivalent O(6)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. In the sixth O site, O(6) is bonded to one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Cu(1), and one Cu(2) atom to form distorted OBa4Cu2 octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(8)Ba4Cu2 octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with three equivalent O(1)Ba5Cu octahedra, corners with three equivalent O(4)Ba5Cu octahedra,  an edgeedge with one O(7)Ba4Cu2 octahedra,  an edgeedge with one O(8)Ba4Cu2 octahedra,  a faceface with one O(2)Ba5Cu octahedra,  a faceface with one O(3)Ba5Cu octahedra,  a faceface with one O(4)Ba5Cu octahedra,  a faceface with one O(9)Ba5Cu octahedra, and faces with two equivalent O(5)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-64°. In the seventh O site, O(7) is bonded to two equivalent Ba(3), two equivalent Ba(4), and two equivalent Cu(2) atoms to form OBa4Cu2 octahedra that share corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(1)Ba5Cu octahedra, corners with two equivalent O(3)Ba5Cu octahedra, corners with two equivalent O(4)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with four equivalent O(2)Ba5Cu octahedra, edges with two equivalent O(6)Ba4Cu2 octahedra, faces with two equivalent O(5)Ba4Cu2 octahedra, faces with two equivalent O(3)Ba5Cu octahedra, and faces with two equivalent O(4)Ba5Cu octahedra. The corner-sharing octahedral tilt angles range from 3-61°. In the eighth O site, O(8) is bonded to one Ba(2), one Ba(5), two equivalent Ba(1), one Cu(1), and one Cu(3) atom to form distorted OBa4Cu2 octahedra that share  a cornercorner with one O(6)Ba4Cu2 octahedra,  a cornercorner with one O(8)Ba4Cu2 octahedra, corners with two equivalent O(1)Ba5Cu octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(4)Ba5Cu octahedra, corners with three equivalent O(3)Ba5Cu octahedra, corners with three equivalent O(9)Ba5Cu octahedra,  an edgeedge with one O(6)Ba4Cu2 octahedra,  an edgeedge with one O(8)Ba4Cu2 octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(2)Ba5Cu octahedra,  a faceface with one O(9)Ba5Cu octahedra, and faces with two equivalent O(1)Ba5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-67°. In the ninth O site, O(9) is bonded to one Ba(1), one Ba(3), three equivalent Ba(5), and one Cu(1) atom to form distorted OBa5Cu octahedra that share  a cornercorner with one O(7)Ba4Cu2 octahedra,  a cornercorner with one O(4)Ba5Cu octahedra, corners with two equivalent O(5)Ba4Cu2 octahedra, corners with two equivalent O(6)Ba4Cu2 octahedra, corners with two equivalent O(2)Ba5Cu octahedra, corners with two equivalent O(9)Ba5Cu octahedra, corners with three equivalent O(8)Ba4Cu2 octahedra, edges with two equivalent O(9)Ba5Cu octahedra, edges with three equivalent O(1)Ba5Cu octahedra, edges with three equivalent O(3)Ba5Cu octahedra,  a faceface with one O(5)Ba4Cu2 octahedra,  a faceface with one O(6)Ba4Cu2 octahedra, and  a faceface with one O(8)Ba4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-67°.