Sr3Nd4O9 crystallizes in the monoclinic Cc space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom. In the third Sr site, Sr(3) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted SrO7 pentagonal bipyramids that share corners with three equivalent Nd(4)O7 pentagonal bipyramids,  a cornercorner with one Nd(2)O6 pentagonal pyramid,  an edgeedge with one Nd(4)O7 pentagonal bipyramid, edges with two equivalent Nd(1)O6 pentagonal pyramids, and edges with two equivalent Nd(2)O6 pentagonal pyramids. There are four inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(1), one O(4), one O(6), one O(7), one O(8), and one O(9) atom to form distorted NdO6 pentagonal pyramids that share  a cornercorner with one Nd(2)O6 pentagonal pyramid, edges with two equivalent Sr(3)O7 pentagonal bipyramids, edges with two equivalent Nd(4)O7 pentagonal bipyramids, and edges with two equivalent Nd(2)O6 pentagonal pyramids. In the second Nd site, Nd(2) is bonded to one O(1), one O(2), one O(6), one O(7), one O(8), and one O(9) atom to form distorted NdO6 pentagonal pyramids that share  a cornercorner with one Sr(3)O7 pentagonal bipyramid, corners with two equivalent Nd(4)O7 pentagonal bipyramids,  a cornercorner with one Nd(1)O6 pentagonal pyramid,  an edgeedge with one Nd(4)O7 pentagonal bipyramid, edges with two equivalent Sr(3)O7 pentagonal bipyramids, and edges with two equivalent Nd(1)O6 pentagonal pyramids. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the fourth Nd site, Nd(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom to form distorted NdO7 pentagonal bipyramids that share corners with three equivalent Sr(3)O7 pentagonal bipyramids, corners with two equivalent Nd(2)O6 pentagonal pyramids,  an edgeedge with one Sr(3)O7 pentagonal bipyramid,  an edgeedge with one Nd(2)O6 pentagonal pyramid, and edges with two equivalent Nd(1)O6 pentagonal pyramids. There are nine inequivalent O sites. In the first O site, O(3) is bonded to one Sr(2), one Sr(3), one Nd(3), and one Nd(4) atom to form distorted OSr2Nd2 trigonal pyramids that share  a cornercorner with one O(7)Sr2Nd4 octahedra,  a cornercorner with one O(9)Sr3Nd3 octahedra,  a cornercorner with one O(4)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid, and  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 48-49°. In the second O site, O(4) is bonded to one Sr(1), one Sr(2), one Nd(1), one Nd(3), and one Nd(4) atom to form OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(2)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 38-71°. In the third O site, O(5) is bonded to one Sr(1), one Sr(2), one Sr(3), one Nd(3), and one Nd(4) atom to form distorted OSr3Nd2 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(6)SrNd4 trigonal bipyramid, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd2 trigonal pyramids,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, edges with two equivalent O(2)Sr2Nd3 trigonal bipyramids, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 45-62°. In the fourth O site, O(6) is bonded to one Sr(1), one Nd(1), one Nd(2), one Nd(3), and one Nd(4) atom to form distorted OSrNd4 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(2)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(5)Sr3Nd2 trigonal bipyramid, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd2 trigonal pyramids,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid, and  a faceface with one O(7)Sr2Nd4 octahedra. The corner-sharing octahedral tilt angles range from 28-53°. In the fifth O site, O(7) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Nd(3), and one Nd(4) atom to form OSr2Nd4 octahedra that share corners with two equivalent O(9)Sr3Nd3 octahedra, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(8)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid,  a faceface with one O(9)Sr3Nd3 octahedra, and  a faceface with one O(6)SrNd4 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-34°. In the sixth O site, O(8) is bonded to one Sr(2), one Sr(3), one Nd(1), one Nd(2), and one Nd(3) atom to form OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(4)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(5)Sr3Nd2 trigonal bipyramid,  a cornercorner with one O(6)SrNd4 trigonal bipyramid, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 37-67°. In the seventh O site, O(9) is bonded to one Sr(1), one Sr(2), one Sr(3), one Nd(1), one Nd(2), and one Nd(4) atom to form OSr3Nd3 octahedra that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(8)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid,  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid, and  a faceface with one O(7)Sr2Nd4 octahedra. The corner-sharing octahedral tilt angles range from 32-34°. In the eighth O site, O(1) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Nd(1), one Nd(2), and one Nd(3) atom. In the ninth O site, O(2) is bonded to one Sr(2), one Sr(3), one Nd(2), one Nd(3), and one Nd(4) atom to form distorted OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(4)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(6)SrNd4 trigonal bipyramid, corners with two equivalent O(8)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd2 trigonal pyramids,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, edges with two equivalent O(5)Sr3Nd2 trigonal bipyramids, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 42-66°.
Sr3Nd4O9 crystallizes in the monoclinic Cc space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The Sr(1)-O(1) bond length is 2.51 Å. The Sr(1)-O(4) bond length is 2.52 Å. The Sr(1)-O(5) bond length is 2.42 Å. The Sr(1)-O(6) bond length is 2.59 Å. The Sr(1)-O(7) bond length is 2.55 Å. The Sr(1)-O(9) bond length is 2.62 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom. The Sr(2)-O(1) bond length is 2.68 Å. The Sr(2)-O(2) bond length is 2.57 Å. The Sr(2)-O(3) bond length is 2.52 Å. The Sr(2)-O(4) bond length is 2.62 Å. The Sr(2)-O(5) bond length is 2.56 Å. The Sr(2)-O(8) bond length is 2.68 Å. The Sr(2)-O(9) bond length is 2.80 Å. In the third Sr site, Sr(3) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted SrO7 pentagonal bipyramids that share corners with three equivalent Nd(4)O7 pentagonal bipyramids,  a cornercorner with one Nd(2)O6 pentagonal pyramid,  an edgeedge with one Nd(4)O7 pentagonal bipyramid, edges with two equivalent Nd(1)O6 pentagonal pyramids, and edges with two equivalent Nd(2)O6 pentagonal pyramids. The Sr(3)-O(1) bond length is 2.63 Å. The Sr(3)-O(2) bond length is 2.56 Å. The Sr(3)-O(3) bond length is 2.50 Å. The Sr(3)-O(5) bond length is 2.87 Å. The Sr(3)-O(7) bond length is 2.66 Å. The Sr(3)-O(8) bond length is 2.55 Å. The Sr(3)-O(9) bond length is 2.63 Å. There are four inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(1), one O(4), one O(6), one O(7), one O(8), and one O(9) atom to form distorted NdO6 pentagonal pyramids that share  a cornercorner with one Nd(2)O6 pentagonal pyramid, edges with two equivalent Sr(3)O7 pentagonal bipyramids, edges with two equivalent Nd(4)O7 pentagonal bipyramids, and edges with two equivalent Nd(2)O6 pentagonal pyramids. The Nd(1)-O(1) bond length is 2.41 Å. The Nd(1)-O(4) bond length is 2.36 Å. The Nd(1)-O(6) bond length is 2.50 Å. The Nd(1)-O(7) bond length is 2.40 Å. The Nd(1)-O(8) bond length is 2.32 Å. The Nd(1)-O(9) bond length is 2.46 Å. In the second Nd site, Nd(2) is bonded to one O(1), one O(2), one O(6), one O(7), one O(8), and one O(9) atom to form distorted NdO6 pentagonal pyramids that share  a cornercorner with one Sr(3)O7 pentagonal bipyramid, corners with two equivalent Nd(4)O7 pentagonal bipyramids,  a cornercorner with one Nd(1)O6 pentagonal pyramid,  an edgeedge with one Nd(4)O7 pentagonal bipyramid, edges with two equivalent Sr(3)O7 pentagonal bipyramids, and edges with two equivalent Nd(1)O6 pentagonal pyramids. The Nd(2)-O(1) bond length is 2.34 Å. The Nd(2)-O(2) bond length is 2.32 Å. The Nd(2)-O(6) bond length is 2.43 Å. The Nd(2)-O(7) bond length is 2.57 Å. The Nd(2)-O(8) bond length is 2.43 Å. The Nd(2)-O(9) bond length is 2.48 Å. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The Nd(3)-O(1) bond length is 3.02 Å. The Nd(3)-O(2) bond length is 2.50 Å. The Nd(3)-O(3) bond length is 2.40 Å. The Nd(3)-O(4) bond length is 2.66 Å. The Nd(3)-O(5) bond length is 2.38 Å. The Nd(3)-O(6) bond length is 2.57 Å. The Nd(3)-O(7) bond length is 2.64 Å. The Nd(3)-O(8) bond length is 2.61 Å. In the fourth Nd site, Nd(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom to form distorted NdO7 pentagonal bipyramids that share corners with three equivalent Sr(3)O7 pentagonal bipyramids, corners with two equivalent Nd(2)O6 pentagonal pyramids,  an edgeedge with one Sr(3)O7 pentagonal bipyramid,  an edgeedge with one Nd(2)O6 pentagonal pyramid, and edges with two equivalent Nd(1)O6 pentagonal pyramids. The Nd(4)-O(2) bond length is 2.81 Å. The Nd(4)-O(3) bond length is 2.35 Å. The Nd(4)-O(4) bond length is 2.42 Å. The Nd(4)-O(5) bond length is 2.37 Å. The Nd(4)-O(6) bond length is 2.52 Å. The Nd(4)-O(7) bond length is 2.67 Å. The Nd(4)-O(9) bond length is 2.52 Å. There are nine inequivalent O sites. In the first O site, O(3) is bonded to one Sr(2), one Sr(3), one Nd(3), and one Nd(4) atom to form distorted OSr2Nd2 trigonal pyramids that share  a cornercorner with one O(7)Sr2Nd4 octahedra,  a cornercorner with one O(9)Sr3Nd3 octahedra,  a cornercorner with one O(4)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid, and  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 48-49°. In the second O site, O(4) is bonded to one Sr(1), one Sr(2), one Nd(1), one Nd(3), and one Nd(4) atom to form OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(2)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 38-71°. In the third O site, O(5) is bonded to one Sr(1), one Sr(2), one Sr(3), one Nd(3), and one Nd(4) atom to form distorted OSr3Nd2 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(6)SrNd4 trigonal bipyramid, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd2 trigonal pyramids,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, edges with two equivalent O(2)Sr2Nd3 trigonal bipyramids, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 45-62°. In the fourth O site, O(6) is bonded to one Sr(1), one Nd(1), one Nd(2), one Nd(3), and one Nd(4) atom to form distorted OSrNd4 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(2)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(8)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(5)Sr3Nd2 trigonal bipyramid, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd2 trigonal pyramids,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid, and  a faceface with one O(7)Sr2Nd4 octahedra. The corner-sharing octahedral tilt angles range from 28-53°. In the fifth O site, O(7) is bonded to one Sr(1), one Sr(3), one Nd(1), one Nd(2), one Nd(3), and one Nd(4) atom to form OSr2Nd4 octahedra that share corners with two equivalent O(9)Sr3Nd3 octahedra, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(8)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid,  a faceface with one O(9)Sr3Nd3 octahedra, and  a faceface with one O(6)SrNd4 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 32-34°. In the sixth O site, O(8) is bonded to one Sr(2), one Sr(3), one Nd(1), one Nd(2), and one Nd(3) atom to form OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(4)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(5)Sr3Nd2 trigonal bipyramid,  a cornercorner with one O(6)SrNd4 trigonal bipyramid, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 37-67°. In the seventh O site, O(9) is bonded to one Sr(1), one Sr(2), one Sr(3), one Nd(1), one Nd(2), and one Nd(4) atom to form OSr3Nd3 octahedra that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(2)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(4)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(8)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(5)Sr3Nd2 trigonal bipyramids, corners with two equivalent O(6)SrNd4 trigonal bipyramids,  a cornercorner with one O(3)Sr2Nd2 trigonal pyramid,  an edgeedge with one O(2)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(5)Sr3Nd2 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid,  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid, and  a faceface with one O(7)Sr2Nd4 octahedra. The corner-sharing octahedral tilt angles range from 32-34°. In the eighth O site, O(1) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Nd(1), one Nd(2), and one Nd(3) atom. In the ninth O site, O(2) is bonded to one Sr(2), one Sr(3), one Nd(2), one Nd(3), and one Nd(4) atom to form distorted OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd4 octahedra, corners with two equivalent O(9)Sr3Nd3 octahedra,  a cornercorner with one O(4)Sr2Nd3 trigonal bipyramid,  a cornercorner with one O(6)SrNd4 trigonal bipyramid, corners with two equivalent O(8)Sr2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd2 trigonal pyramids,  an edgeedge with one O(7)Sr2Nd4 octahedra,  an edgeedge with one O(9)Sr3Nd3 octahedra,  an edgeedge with one O(4)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(8)Sr2Nd3 trigonal bipyramid,  an edgeedge with one O(6)SrNd4 trigonal bipyramid, edges with two equivalent O(5)Sr3Nd2 trigonal bipyramids, and  an edgeedge with one O(3)Sr2Nd2 trigonal pyramid. The corner-sharing octahedral tilt angles range from 42-66°.