The material structure described by Sr4CuIr2O9 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are twelve inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(14), one O(16), one O(2), one O(20), one O(22), one O(26), one O(3), one O(8), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(15), one O(17), one O(21), one O(23), one O(27), one O(3), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(1), one O(13), one O(18), one O(19), one O(2), one O(24), one O(25), one O(7), and one O(8) atom. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(18), one O(19), one O(24), one O(25), one O(5), and one O(6) atom. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(14), one O(16), one O(20), one O(22), one O(26), one O(4), and one O(6) atom. In the sixth Sr site, Sr(6) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(15), one O(17), one O(21), one O(23), one O(27), one O(4), and one O(5) atom. In the seventh Sr site, Sr(7) is bonded in a 10-coordinate geometry to one O(11), one O(13), one O(15), one O(16), one O(18), one O(26), one O(27), one O(3), one O(4), and one O(8) atom. In the eighth Sr site, Sr(8) is bonded in a 10-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(16), one O(17), one O(25), one O(27), one O(5), and one O(9) atom. In the ninth Sr site, Sr(9) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(15), one O(17), one O(18), one O(2), one O(25), one O(26), one O(6), and one O(7) atom. In the tenth Sr site, Sr(10) is bonded in a 8-coordinate geometry to one O(11), one O(19), one O(21), one O(22), one O(24), one O(3), one O(4), and one O(8) atom. In the eleventh Sr site, Sr(11) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(19), one O(20), one O(22), one O(23), one O(5), and one O(9) atom. In the twelfth Sr site, Sr(12) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(20), one O(21), one O(23), one O(24), one O(6), and one O(7) atom. There are six inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to one O(16), one O(17), one O(18), one O(7), one O(8), and one O(9) atom to form face-sharing IrO6 octahedra. In the second Ir site, Ir(2) is bonded to one O(10), one O(11), one O(12), one O(13), one O(14), and one O(15) atom to form face-sharing IrO6 octahedra. In the third Ir site, Ir(3) is bonded to one O(1), one O(2), one O(25), one O(26), one O(27), and one O(3) atom to form face-sharing IrO6 octahedra. In the fourth Ir site, Ir(4) is bonded to one O(25), one O(26), one O(27), one O(4), one O(5), and one O(6) atom to form face-sharing IrO6 octahedra. In the fifth Ir site, Ir(5) is bonded to one O(22), one O(23), one O(24), one O(7), one O(8), and one O(9) atom to form face-sharing IrO6 octahedra. In the sixth Ir site, Ir(6) is bonded to one O(10), one O(11), one O(12), one O(19), one O(20), and one O(21) atom to form face-sharing IrO6 octahedra. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(2), one O(5), and one O(6) atom. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(16), one O(18), one O(22), and one O(24) atom. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to one O(14), one O(15), one O(20), and one O(21) atom. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded to one Sr(11), one Sr(2), one Sr(3), one Sr(8), one Ir(3), and one Cu(1) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(12)Sr4Ir2 octahedra, corners with two equivalent O(7)Sr4Ir2 octahedra,  an edgeedge with one O(5)Sr4CuIr octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  an edgeedge with one O(3)Sr4Ir square pyramid,  a faceface with one O(25)Sr4Ir2 octahedra,  a faceface with one O(27)Sr4Ir2 octahedra, and  a faceface with one O(9)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 2-69°. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(12), one Sr(3), one Sr(9), one Ir(3), and one Cu(1) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(10), one Sr(2), one Sr(7), and one Ir(3) atom to form distorted OSr4Ir square pyramids that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with two equivalent O(11)Sr4Ir2 octahedra, corners with two equivalent O(9)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(4)Sr4Ir square pyramids,  an edgeedge with one O(1)Sr4CuIr octahedra,  an edgeedge with one O(21)Sr4CuIr octahedra,  an edgeedge with one O(22)Sr4CuIr octahedra,  a faceface with one O(26)Sr4Ir2 octahedra,  a faceface with one O(27)Sr4Ir2 octahedra, and  a faceface with one O(8)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 4-57°. In the fourth O site, O(4) is bonded to one Sr(10), one Sr(5), one Sr(6), one Sr(7), and one Ir(4) atom to form distorted OSr4Ir square pyramids that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra, corners with two equivalent O(10)Sr4Ir2 octahedra, corners with two equivalent O(8)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(3)Sr4Ir square pyramids,  an edgeedge with one O(21)Sr4CuIr octahedra,  an edgeedge with one O(22)Sr4CuIr octahedra,  an edgeedge with one O(5)Sr4CuIr octahedra,  a faceface with one O(11)Sr4Ir2 octahedra,  a faceface with one O(26)Sr4Ir2 octahedra, and  a faceface with one O(27)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 4-65°. In the fifth O site, O(5) is bonded to one Sr(11), one Sr(4), one Sr(6), one Sr(8), one Ir(4), and one Cu(1) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra, corners with two equivalent O(11)Sr4Ir2 octahedra, corners with two equivalent O(9)Sr4Ir2 octahedra,  an edgeedge with one O(1)Sr4CuIr octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  an edgeedge with one O(4)Sr4Ir square pyramid,  a faceface with one O(12)Sr4Ir2 octahedra,  a faceface with one O(25)Sr4Ir2 octahedra, and  a faceface with one O(27)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 0-67°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(12), one Sr(4), one Sr(5), one Sr(9), one Ir(4), and one Cu(1) atom. In the seventh O site, O(7) is bonded to one Sr(12), one Sr(2), one Sr(3), one Sr(9), one Ir(1), and one Ir(5) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(1)Sr4CuIr octahedra, corners with two equivalent O(10)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  an edgeedge with one O(21)Sr4CuIr octahedra,  an edgeedge with one O(25)Sr4Ir2 octahedra,  a faceface with one O(24)Sr4CuIr octahedra,  a faceface with one O(8)Sr4Ir2 octahedra,  a faceface with one O(9)Sr4Ir2 octahedra, and  a faceface with one O(23)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 1-67°. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(10), one Sr(3), one Sr(7), one Ir(1), and one Ir(5) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(11)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(4)Sr4Ir square pyramids,  an edgeedge with one O(26)Sr4Ir2 octahedra,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(24)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra,  a faceface with one O(9)Sr4Ir2 octahedra, and  a faceface with one O(3)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 7-65°. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(11), one Sr(2), one Sr(8), one Ir(1), and one Ir(5) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra, corners with two equivalent O(5)Sr4CuIr octahedra, corners with two equivalent O(12)Sr4Ir2 octahedra, corners with two equivalent O(3)Sr4Ir square pyramids,  an edgeedge with one O(20)Sr4CuIr octahedra,  an edgeedge with one O(27)Sr4Ir2 octahedra,  a faceface with one O(1)Sr4CuIr octahedra,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra,  a faceface with one O(8)Sr4Ir2 octahedra, and  a faceface with one O(23)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 3-58°. In the tenth O site, O(10) is bonded to one Sr(12), one Sr(5), one Sr(6), one Sr(9), one Ir(2), and one Ir(6) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(7)Sr4Ir2 octahedra, corners with two equivalent O(4)Sr4Ir square pyramids,  an edgeedge with one O(26)Sr4Ir2 octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(11)Sr4Ir2 octahedra, and  a faceface with one O(12)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 8-64°. In the eleventh O site, O(11) is bonded to one Sr(10), one Sr(4), one Sr(6), one Sr(7), one Ir(2), and one Ir(6) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra, corners with two equivalent O(5)Sr4CuIr octahedra, corners with two equivalent O(8)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(3)Sr4Ir square pyramids,  an edgeedge with one O(24)Sr4CuIr octahedra,  an edgeedge with one O(27)Sr4Ir2 octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra,  a faceface with one O(12)Sr4Ir2 octahedra, and  a faceface with one O(4)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 1-68°. In the twelfth O site, O(12) is bonded to one Sr(11), one Sr(4), one Sr(5), one Sr(8), one Ir(2), and one Ir(6) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(1)Sr4CuIr octahedra, corners with two equivalent O(9)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(22)Sr4CuIr octahedra,  an edgeedge with one O(25)Sr4Ir2 octahedra,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(5)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra, and  a faceface with one O(11)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 2-59°. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Sr(7), one Sr(8), and one Ir(2) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), one Sr(8), one Sr(9), one Ir(2), and one Cu(3) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), one Sr(9), one Ir(2), and one Cu(3) atom. In the sixteenth O site, O(16) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), one Sr(7), one Sr(8), one Ir(1), and one Cu(2) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(6), one Sr(8), one Sr(9), and one Ir(1) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Sr(7), one Sr(9), one Ir(1), and one Cu(2) atom. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(11), one Sr(3), one Sr(4), and one Ir(6) atom. In the twentieth O site, O(20) is bonded to one Sr(1), one Sr(11), one Sr(12), one Sr(5), one Ir(6), and one Cu(3) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(26)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid, corners with two equivalent O(23)Sr4Ir square pyramids,  an edgeedge with one O(9)Sr4Ir2 octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra, and  a faceface with one O(12)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-67°. In the twenty-first O site, O(21) is bonded to one Sr(10), one Sr(12), one Sr(2), one Sr(6), one Ir(6), and one Cu(3) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(24)Sr4CuIr octahedra, corners with two equivalent O(27)Sr4Ir2 octahedra,  an edgeedge with one O(7)Sr4Ir2 octahedra,  an edgeedge with one O(3)Sr4Ir square pyramid,  an edgeedge with one O(4)Sr4Ir square pyramid,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra,  a faceface with one O(11)Sr4Ir2 octahedra, and  a faceface with one O(23)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 2-67°. In the twenty-second O site, O(22) is bonded to one Sr(1), one Sr(10), one Sr(11), one Sr(5), one Ir(5), and one Cu(2) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with two equivalent O(26)Sr4Ir2 octahedra,  an edgeedge with one O(12)Sr4Ir2 octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  an edgeedge with one O(3)Sr4Ir square pyramid,  an edgeedge with one O(4)Sr4Ir square pyramid,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(24)Sr4CuIr octahedra,  a faceface with one O(8)Sr4Ir2 octahedra, and  a faceface with one O(9)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°. In the twenty-third O site, O(23) is bonded to one Sr(11), one Sr(12), one Sr(2), one Sr(6), and one Ir(5) atom to form distorted OSr4Ir square pyramids that share  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(20)Sr4CuIr octahedra, corners with two equivalent O(27)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(1)Sr4CuIr octahedra,  an edgeedge with one O(22)Sr4CuIr octahedra,  an edgeedge with one O(24)Sr4CuIr octahedra,  an edgeedge with one O(5)Sr4CuIr octahedra,  an edgeedge with one O(10)Sr4Ir2 octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra, and  a faceface with one O(9)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 3-62°. In the twenty-fourth O site, O(24) is bonded to one Sr(10), one Sr(12), one Sr(3), one Sr(4), one Ir(5), and one Cu(2) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(21)Sr4CuIr octahedra, corners with two equivalent O(25)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(11)Sr4Ir2 octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra, and  a faceface with one O(8)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 3-69°. In the twenty-fifth O site, O(25) is bonded to one Sr(3), one Sr(4), one Sr(8), one Sr(9), one Ir(3), and one Ir(4) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(24)Sr4CuIr octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(12)Sr4Ir2 octahedra,  an edgeedge with one O(7)Sr4Ir2 octahedra,  a faceface with one O(1)Sr4CuIr octahedra,  a faceface with one O(5)Sr4CuIr octahedra,  a faceface with one O(26)Sr4Ir2 octahedra, and  a faceface with one O(27)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 35-59°. In the twenty-sixth O site, O(26) is bonded to one Sr(1), one Sr(5), one Sr(7), one Sr(9), one Ir(3), and one Ir(4) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(20)Sr4CuIr octahedra, corners with two equivalent O(22)Sr4CuIr octahedra,  an edgeedge with one O(10)Sr4Ir2 octahedra,  an edgeedge with one O(8)Sr4Ir2 octahedra,  a faceface with one O(25)Sr4Ir2 octahedra,  a faceface with one O(27)Sr4Ir2 octahedra,  a faceface with one O(3)Sr4Ir square pyramid, and  a faceface with one O(4)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 0-59°. In the twenty-seventh O site, O(27) is bonded to one Sr(2), one Sr(6), one Sr(7), one Sr(8), one Ir(3), and one Ir(4) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(21)Sr4CuIr octahedra, corners with two equivalent O(23)Sr4Ir square pyramids,  an edgeedge with one O(11)Sr4Ir2 octahedra,  an edgeedge with one O(9)Sr4Ir2 octahedra,  a faceface with one O(1)Sr4CuIr octahedra,  a faceface with one O(5)Sr4CuIr octahedra,  a faceface with one O(25)Sr4Ir2 octahedra,  a faceface with one O(26)Sr4Ir2 octahedra,  a faceface with one O(3)Sr4Ir square pyramid, and  a faceface with one O(4)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 33-60°. is represented by the CIF file [CIF]
data_Sr4CuIr2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.073
_cell_length_b   9.804
_cell_length_c   9.851
_cell_angle_alpha   119.638
_cell_angle_beta   90.126
_cell_angle_gamma   90.031
_symmetry_Int_Tables_number   1
_cell_volume   677.651
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Sr  Sr0  1  0.254  0.694  0.667  1.0
  Sr  Sr1  1  0.252  0.330  0.023  1.0
  Sr  Sr2  1  0.252  0.989  0.324  1.0
  Sr  Sr3  1  0.752  0.027  0.339  1.0
  Sr  Sr4  1  0.745  0.671  0.693  1.0
  Sr  Sr5  1  0.744  0.316  0.987  1.0
  Sr  Sr6  1  0.001  0.004  0.678  1.0
  Sr  Sr7  1  0.999  0.322  0.323  1.0
  Sr  Sr8  1  0.999  0.676  0.005  1.0
  Sr  Sr9  1  0.497  0.007  0.653  1.0
  Sr  Sr10  1  0.501  0.359  0.359  1.0
  Sr  Sr11  1  0.504  0.642  0.007  1.0
  Cu  Cu12  1  0.500  1.000  0.062  1.0
  Cu  Cu13  1  0.734  0.726  0.389  1.0
  Cu  Cu14  1  0.266  0.390  0.726  1.0
  Ir  Ir15  1  0.079  0.661  0.330  1.0
  Ir  Ir16  1  0.921  0.334  0.665  1.0
  Ir  Ir17  1  0.156  0.998  0.997  1.0
  Ir  Ir18  1  0.844  0.998  0.996  1.0
  Ir  Ir19  1  0.391  0.662  0.331  1.0
  Ir  Ir20  1  0.609  0.333  0.664  1.0
  O  O21  1  0.309  0.155  0.164  1.0
  O  O22  1  0.312  0.841  0.002  1.0
  O  O23  1  0.288  0.006  0.832  1.0
  O  O24  1  0.710  0.995  0.827  1.0
  O  O25  1  0.691  0.159  0.158  1.0
  O  O26  1  0.689  0.843  0.008  1.0
  O  O27  1  0.237  0.643  0.152  1.0
  O  O28  1  0.237  0.846  0.492  1.0
  O  O29  1  0.236  0.502  0.352  1.0
  O  O30  1  0.764  0.496  0.849  1.0
  O  O31  1  0.763  0.155  0.645  1.0
  O  O32  1  0.763  0.354  0.505  1.0
  O  O33  1  0.051  0.179  0.490  1.0
  O  O34  1  0.077  0.502  0.689  1.0
  O  O35  1  0.078  0.318  0.812  1.0
  O  O36  1  0.924  0.684  0.497  1.0
  O  O37  1  0.947  0.487  0.176  1.0
  O  O38  1  0.922  0.809  0.314  1.0
  O  O39  1  0.474  0.174  0.488  1.0
  O  O40  1  0.456  0.507  0.687  1.0
  O  O41  1  0.456  0.319  0.819  1.0
  O  O42  1  0.543  0.685  0.505  1.0
  O  O43  1  0.525  0.484  0.172  1.0
  O  O44  1  0.546  0.817  0.319  1.0
  O  O45  1  0.001  0.995  0.165  1.0
  O  O46  1  0.000  0.833  0.830  1.0
  O  O47  1  0.999  0.162  0.992  1.0
[/CIF]
.
The material structure described by Sr4CuIr2O9 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are twelve inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(14), one O(16), one O(2), one O(20), one O(22), one O(26), one O(3), one O(8), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(15), one O(17), one O(21), one O(23), one O(27), one O(3), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(1), one O(13), one O(18), one O(19), one O(2), one O(24), one O(25), one O(7), and one O(8) atom. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(13), one O(18), one O(19), one O(24), one O(25), one O(5), and one O(6) atom. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(14), one O(16), one O(20), one O(22), one O(26), one O(4), and one O(6) atom. In the sixth Sr site, Sr(6) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(15), one O(17), one O(21), one O(23), one O(27), one O(4), and one O(5) atom. In the seventh Sr site, Sr(7) is bonded in a 10-coordinate geometry to one O(11), one O(13), one O(15), one O(16), one O(18), one O(26), one O(27), one O(3), one O(4), and one O(8) atom. In the eighth Sr site, Sr(8) is bonded in a 10-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(16), one O(17), one O(25), one O(27), one O(5), and one O(9) atom. In the ninth Sr site, Sr(9) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(15), one O(17), one O(18), one O(2), one O(25), one O(26), one O(6), and one O(7) atom. In the tenth Sr site, Sr(10) is bonded in a 8-coordinate geometry to one O(11), one O(19), one O(21), one O(22), one O(24), one O(3), one O(4), and one O(8) atom. In the eleventh Sr site, Sr(11) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(19), one O(20), one O(22), one O(23), one O(5), and one O(9) atom. In the twelfth Sr site, Sr(12) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(20), one O(21), one O(23), one O(24), one O(6), and one O(7) atom. There are six inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to one O(16), one O(17), one O(18), one O(7), one O(8), and one O(9) atom to form face-sharing IrO6 octahedra. In the second Ir site, Ir(2) is bonded to one O(10), one O(11), one O(12), one O(13), one O(14), and one O(15) atom to form face-sharing IrO6 octahedra. In the third Ir site, Ir(3) is bonded to one O(1), one O(2), one O(25), one O(26), one O(27), and one O(3) atom to form face-sharing IrO6 octahedra. In the fourth Ir site, Ir(4) is bonded to one O(25), one O(26), one O(27), one O(4), one O(5), and one O(6) atom to form face-sharing IrO6 octahedra. In the fifth Ir site, Ir(5) is bonded to one O(22), one O(23), one O(24), one O(7), one O(8), and one O(9) atom to form face-sharing IrO6 octahedra. In the sixth Ir site, Ir(6) is bonded to one O(10), one O(11), one O(12), one O(19), one O(20), and one O(21) atom to form face-sharing IrO6 octahedra. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(2), one O(5), and one O(6) atom. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(16), one O(18), one O(22), and one O(24) atom. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to one O(14), one O(15), one O(20), and one O(21) atom. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded to one Sr(11), one Sr(2), one Sr(3), one Sr(8), one Ir(3), and one Cu(1) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(12)Sr4Ir2 octahedra, corners with two equivalent O(7)Sr4Ir2 octahedra,  an edgeedge with one O(5)Sr4CuIr octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  an edgeedge with one O(3)Sr4Ir square pyramid,  a faceface with one O(25)Sr4Ir2 octahedra,  a faceface with one O(27)Sr4Ir2 octahedra, and  a faceface with one O(9)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 2-69°. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(12), one Sr(3), one Sr(9), one Ir(3), and one Cu(1) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(10), one Sr(2), one Sr(7), and one Ir(3) atom to form distorted OSr4Ir square pyramids that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with two equivalent O(11)Sr4Ir2 octahedra, corners with two equivalent O(9)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(4)Sr4Ir square pyramids,  an edgeedge with one O(1)Sr4CuIr octahedra,  an edgeedge with one O(21)Sr4CuIr octahedra,  an edgeedge with one O(22)Sr4CuIr octahedra,  a faceface with one O(26)Sr4Ir2 octahedra,  a faceface with one O(27)Sr4Ir2 octahedra, and  a faceface with one O(8)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 4-57°. In the fourth O site, O(4) is bonded to one Sr(10), one Sr(5), one Sr(6), one Sr(7), and one Ir(4) atom to form distorted OSr4Ir square pyramids that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra, corners with two equivalent O(10)Sr4Ir2 octahedra, corners with two equivalent O(8)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(3)Sr4Ir square pyramids,  an edgeedge with one O(21)Sr4CuIr octahedra,  an edgeedge with one O(22)Sr4CuIr octahedra,  an edgeedge with one O(5)Sr4CuIr octahedra,  a faceface with one O(11)Sr4Ir2 octahedra,  a faceface with one O(26)Sr4Ir2 octahedra, and  a faceface with one O(27)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 4-65°. In the fifth O site, O(5) is bonded to one Sr(11), one Sr(4), one Sr(6), one Sr(8), one Ir(4), and one Cu(1) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra, corners with two equivalent O(11)Sr4Ir2 octahedra, corners with two equivalent O(9)Sr4Ir2 octahedra,  an edgeedge with one O(1)Sr4CuIr octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  an edgeedge with one O(4)Sr4Ir square pyramid,  a faceface with one O(12)Sr4Ir2 octahedra,  a faceface with one O(25)Sr4Ir2 octahedra, and  a faceface with one O(27)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 0-67°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(12), one Sr(4), one Sr(5), one Sr(9), one Ir(4), and one Cu(1) atom. In the seventh O site, O(7) is bonded to one Sr(12), one Sr(2), one Sr(3), one Sr(9), one Ir(1), and one Ir(5) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(1)Sr4CuIr octahedra, corners with two equivalent O(10)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  an edgeedge with one O(21)Sr4CuIr octahedra,  an edgeedge with one O(25)Sr4Ir2 octahedra,  a faceface with one O(24)Sr4CuIr octahedra,  a faceface with one O(8)Sr4Ir2 octahedra,  a faceface with one O(9)Sr4Ir2 octahedra, and  a faceface with one O(23)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 1-67°. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(10), one Sr(3), one Sr(7), one Ir(1), and one Ir(5) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(11)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(4)Sr4Ir square pyramids,  an edgeedge with one O(26)Sr4Ir2 octahedra,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(24)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra,  a faceface with one O(9)Sr4Ir2 octahedra, and  a faceface with one O(3)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 7-65°. In the ninth O site, O(9) is bonded to one Sr(1), one Sr(11), one Sr(2), one Sr(8), one Ir(1), and one Ir(5) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra, corners with two equivalent O(5)Sr4CuIr octahedra, corners with two equivalent O(12)Sr4Ir2 octahedra, corners with two equivalent O(3)Sr4Ir square pyramids,  an edgeedge with one O(20)Sr4CuIr octahedra,  an edgeedge with one O(27)Sr4Ir2 octahedra,  a faceface with one O(1)Sr4CuIr octahedra,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra,  a faceface with one O(8)Sr4Ir2 octahedra, and  a faceface with one O(23)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 3-58°. In the tenth O site, O(10) is bonded to one Sr(12), one Sr(5), one Sr(6), one Sr(9), one Ir(2), and one Ir(6) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(7)Sr4Ir2 octahedra, corners with two equivalent O(4)Sr4Ir square pyramids,  an edgeedge with one O(26)Sr4Ir2 octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(11)Sr4Ir2 octahedra, and  a faceface with one O(12)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 8-64°. In the eleventh O site, O(11) is bonded to one Sr(10), one Sr(4), one Sr(6), one Sr(7), one Ir(2), and one Ir(6) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(25)Sr4Ir2 octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra, corners with two equivalent O(5)Sr4CuIr octahedra, corners with two equivalent O(8)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid, corners with two equivalent O(3)Sr4Ir square pyramids,  an edgeedge with one O(24)Sr4CuIr octahedra,  an edgeedge with one O(27)Sr4Ir2 octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra,  a faceface with one O(12)Sr4Ir2 octahedra, and  a faceface with one O(4)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 1-68°. In the twelfth O site, O(12) is bonded to one Sr(11), one Sr(4), one Sr(5), one Sr(8), one Ir(2), and one Ir(6) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(26)Sr4Ir2 octahedra,  a cornercorner with one O(27)Sr4Ir2 octahedra, corners with two equivalent O(1)Sr4CuIr octahedra, corners with two equivalent O(9)Sr4Ir2 octahedra,  a cornercorner with one O(23)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(22)Sr4CuIr octahedra,  an edgeedge with one O(25)Sr4Ir2 octahedra,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(5)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra, and  a faceface with one O(11)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 2-59°. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Sr(7), one Sr(8), and one Ir(2) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), one Sr(8), one Sr(9), one Ir(2), and one Cu(3) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), one Sr(9), one Ir(2), and one Cu(3) atom. In the sixteenth O site, O(16) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), one Sr(7), one Sr(8), one Ir(1), and one Cu(2) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(6), one Sr(8), one Sr(9), and one Ir(1) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Sr(7), one Sr(9), one Ir(1), and one Cu(2) atom. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(11), one Sr(3), one Sr(4), and one Ir(6) atom. In the twentieth O site, O(20) is bonded to one Sr(1), one Sr(11), one Sr(12), one Sr(5), one Ir(6), and one Cu(3) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(24)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(26)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid, corners with two equivalent O(23)Sr4Ir square pyramids,  an edgeedge with one O(9)Sr4Ir2 octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra, and  a faceface with one O(12)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-67°. In the twenty-first O site, O(21) is bonded to one Sr(10), one Sr(12), one Sr(2), one Sr(6), one Ir(6), and one Cu(3) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(22)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(24)Sr4CuIr octahedra, corners with two equivalent O(27)Sr4Ir2 octahedra,  an edgeedge with one O(7)Sr4Ir2 octahedra,  an edgeedge with one O(3)Sr4Ir square pyramid,  an edgeedge with one O(4)Sr4Ir square pyramid,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(10)Sr4Ir2 octahedra,  a faceface with one O(11)Sr4Ir2 octahedra, and  a faceface with one O(23)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 2-67°. In the twenty-second O site, O(22) is bonded to one Sr(1), one Sr(10), one Sr(11), one Sr(5), one Ir(5), and one Cu(2) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(21)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra, corners with two equivalent O(26)Sr4Ir2 octahedra,  an edgeedge with one O(12)Sr4Ir2 octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  an edgeedge with one O(3)Sr4Ir square pyramid,  an edgeedge with one O(4)Sr4Ir square pyramid,  a faceface with one O(20)Sr4CuIr octahedra,  a faceface with one O(24)Sr4CuIr octahedra,  a faceface with one O(8)Sr4Ir2 octahedra, and  a faceface with one O(9)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°. In the twenty-third O site, O(23) is bonded to one Sr(11), one Sr(12), one Sr(2), one Sr(6), and one Ir(5) atom to form distorted OSr4Ir square pyramids that share  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(20)Sr4CuIr octahedra, corners with two equivalent O(27)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(1)Sr4CuIr octahedra,  an edgeedge with one O(22)Sr4CuIr octahedra,  an edgeedge with one O(24)Sr4CuIr octahedra,  an edgeedge with one O(5)Sr4CuIr octahedra,  an edgeedge with one O(10)Sr4Ir2 octahedra,  a faceface with one O(21)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra, and  a faceface with one O(9)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 3-62°. In the twenty-fourth O site, O(24) is bonded to one Sr(10), one Sr(12), one Sr(3), one Sr(4), one Ir(5), and one Cu(2) atom to form distorted OSr4CuIr octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(20)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(21)Sr4CuIr octahedra, corners with two equivalent O(25)Sr4Ir2 octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(11)Sr4Ir2 octahedra,  an edgeedge with one O(23)Sr4Ir square pyramid,  a faceface with one O(22)Sr4CuIr octahedra,  a faceface with one O(7)Sr4Ir2 octahedra, and  a faceface with one O(8)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 3-69°. In the twenty-fifth O site, O(25) is bonded to one Sr(3), one Sr(4), one Sr(8), one Sr(9), one Ir(3), and one Ir(4) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(24)Sr4CuIr octahedra,  a cornercorner with one O(3)Sr4Ir square pyramid,  a cornercorner with one O(4)Sr4Ir square pyramid,  an edgeedge with one O(12)Sr4Ir2 octahedra,  an edgeedge with one O(7)Sr4Ir2 octahedra,  a faceface with one O(1)Sr4CuIr octahedra,  a faceface with one O(5)Sr4CuIr octahedra,  a faceface with one O(26)Sr4Ir2 octahedra, and  a faceface with one O(27)Sr4Ir2 octahedra. The corner-sharing octahedral tilt angles range from 35-59°. In the twenty-sixth O site, O(26) is bonded to one Sr(1), one Sr(5), one Sr(7), one Sr(9), one Ir(3), and one Ir(4) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(1)Sr4CuIr octahedra,  a cornercorner with one O(5)Sr4CuIr octahedra,  a cornercorner with one O(11)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra,  a cornercorner with one O(9)Sr4Ir2 octahedra, corners with two equivalent O(20)Sr4CuIr octahedra, corners with two equivalent O(22)Sr4CuIr octahedra,  an edgeedge with one O(10)Sr4Ir2 octahedra,  an edgeedge with one O(8)Sr4Ir2 octahedra,  a faceface with one O(25)Sr4Ir2 octahedra,  a faceface with one O(27)Sr4Ir2 octahedra,  a faceface with one O(3)Sr4Ir square pyramid, and  a faceface with one O(4)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 0-59°. In the twenty-seventh O site, O(27) is bonded to one Sr(2), one Sr(6), one Sr(7), one Sr(8), one Ir(3), and one Ir(4) atom to form distorted OSr4Ir2 octahedra that share  a cornercorner with one O(10)Sr4Ir2 octahedra,  a cornercorner with one O(12)Sr4Ir2 octahedra,  a cornercorner with one O(7)Sr4Ir2 octahedra,  a cornercorner with one O(8)Sr4Ir2 octahedra, corners with two equivalent O(21)Sr4CuIr octahedra, corners with two equivalent O(23)Sr4Ir square pyramids,  an edgeedge with one O(11)Sr4Ir2 octahedra,  an edgeedge with one O(9)Sr4Ir2 octahedra,  a faceface with one O(1)Sr4CuIr octahedra,  a faceface with one O(5)Sr4CuIr octahedra,  a faceface with one O(25)Sr4Ir2 octahedra,  a faceface with one O(26)Sr4Ir2 octahedra,  a faceface with one O(3)Sr4Ir square pyramid, and  a faceface with one O(4)Sr4Ir square pyramid. The corner-sharing octahedral tilt angles range from 33-60°. is represented by the CIF file [CIF]
data_Sr4CuIr2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.073
_cell_length_b   9.804
_cell_length_c   9.851
_cell_angle_alpha   119.638
_cell_angle_beta   90.126
_cell_angle_gamma   90.031
_symmetry_Int_Tables_number   1
_cell_volume   677.651
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Sr  Sr0  1  0.254  0.694  0.667  1.0
  Sr  Sr1  1  0.252  0.330  0.023  1.0
  Sr  Sr2  1  0.252  0.989  0.324  1.0
  Sr  Sr3  1  0.752  0.027  0.339  1.0
  Sr  Sr4  1  0.745  0.671  0.693  1.0
  Sr  Sr5  1  0.744  0.316  0.987  1.0
  Sr  Sr6  1  0.001  0.004  0.678  1.0
  Sr  Sr7  1  0.999  0.322  0.323  1.0
  Sr  Sr8  1  0.999  0.676  0.005  1.0
  Sr  Sr9  1  0.497  0.007  0.653  1.0
  Sr  Sr10  1  0.501  0.359  0.359  1.0
  Sr  Sr11  1  0.504  0.642  0.007  1.0
  Cu  Cu12  1  0.500  1.000  0.062  1.0
  Cu  Cu13  1  0.734  0.726  0.389  1.0
  Cu  Cu14  1  0.266  0.390  0.726  1.0
  Ir  Ir15  1  0.079  0.661  0.330  1.0
  Ir  Ir16  1  0.921  0.334  0.665  1.0
  Ir  Ir17  1  0.156  0.998  0.997  1.0
  Ir  Ir18  1  0.844  0.998  0.996  1.0
  Ir  Ir19  1  0.391  0.662  0.331  1.0
  Ir  Ir20  1  0.609  0.333  0.664  1.0
  O  O21  1  0.309  0.155  0.164  1.0
  O  O22  1  0.312  0.841  0.002  1.0
  O  O23  1  0.288  0.006  0.832  1.0
  O  O24  1  0.710  0.995  0.827  1.0
  O  O25  1  0.691  0.159  0.158  1.0
  O  O26  1  0.689  0.843  0.008  1.0
  O  O27  1  0.237  0.643  0.152  1.0
  O  O28  1  0.237  0.846  0.492  1.0
  O  O29  1  0.236  0.502  0.352  1.0
  O  O30  1  0.764  0.496  0.849  1.0
  O  O31  1  0.763  0.155  0.645  1.0
  O  O32  1  0.763  0.354  0.505  1.0
  O  O33  1  0.051  0.179  0.490  1.0
  O  O34  1  0.077  0.502  0.689  1.0
  O  O35  1  0.078  0.318  0.812  1.0
  O  O36  1  0.924  0.684  0.497  1.0
  O  O37  1  0.947  0.487  0.176  1.0
  O  O38  1  0.922  0.809  0.314  1.0
  O  O39  1  0.474  0.174  0.488  1.0
  O  O40  1  0.456  0.507  0.687  1.0
  O  O41  1  0.456  0.319  0.819  1.0
  O  O42  1  0.543  0.685  0.505  1.0
  O  O43  1  0.525  0.484  0.172  1.0
  O  O44  1  0.546  0.817  0.319  1.0
  O  O45  1  0.001  0.995  0.165  1.0
  O  O46  1  0.000  0.833  0.830  1.0
  O  O47  1  0.999  0.162  0.992  1.0
[/CIF]
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