La4Sr3O9 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(15), one O(16), one O(6), and one O(7) atom to form distorted SrO5 trigonal bipyramids that share  a cornercorner with one La(7)O6 octahedra,  a cornercorner with one La(8)O4 tetrahedra,  a cornercorner with one Sr(4)O5 trigonal bipyramid, and corners with two equivalent La(5)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 81°. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(15), one O(17), one O(2), one O(7), and one O(8) atom. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(12), one O(18), one O(2), one O(3), one O(4), and one O(6) atom. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(13), one O(14), one O(8), and one O(9) atom to form distorted SrO5 trigonal bipyramids that share  a cornercorner with one La(7)O6 octahedra, corners with two equivalent La(8)O4 tetrahedra,  a cornercorner with one Sr(1)O5 trigonal bipyramid,  a cornercorner with one La(4)O5 trigonal bipyramid,  a cornercorner with one La(5)O4 trigonal pyramid, and  an edgeedge with one La(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 38°. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one O(12), one O(15), one O(16), one O(17), one O(3), and one O(7) atom. In the sixth Sr site, Sr(6) is bonded in a 5-coordinate geometry to one O(13), one O(14), one O(18), one O(4), and one O(5) atom. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 5-coordinate geometry to one O(12), one O(15), one O(3), one O(7), and one O(9) atom. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(15), one O(17), one O(3), one O(5), and one O(6) atom. In the third La site, La(3) is bonded to one O(18), one O(2), one O(3), one O(8), and one O(9) atom to form distorted LaO5 trigonal bipyramids that share  a cornercorner with one La(8)O4 tetrahedra,  a cornercorner with one La(4)O5 trigonal bipyramid, and  an edgeedge with one Sr(4)O5 trigonal bipyramid. In the fourth La site, La(4) is bonded to one O(10), one O(14), one O(2), one O(4), and one O(5) atom to form LaO5 trigonal bipyramids that share  a cornercorner with one La(8)O4 tetrahedra,  a cornercorner with one Sr(4)O5 trigonal bipyramid,  a cornercorner with one La(3)O5 trigonal bipyramid, and  an edgeedge with one La(7)O6 octahedra. In the fifth La site, La(5) is bonded to one O(11), one O(13), one O(16), and one O(7) atom to form LaO4 trigonal pyramids that share  a cornercorner with one La(7)O6 octahedra,  a cornercorner with one Sr(4)O5 trigonal bipyramid, corners with two equivalent Sr(1)O5 trigonal bipyramids, and  an edgeedge with one La(8)O4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. In the sixth La site, La(6) is bonded in a 6-coordinate geometry to one O(1), one O(15), one O(17), one O(18), one O(5), and one O(8) atom. In the seventh La site, La(7) is bonded to one O(10), one O(11), one O(12), one O(14), one O(17), and one O(6) atom to form distorted LaO6 octahedra that share  a cornercorner with one Sr(1)O5 trigonal bipyramid,  a cornercorner with one Sr(4)O5 trigonal bipyramid,  a cornercorner with one La(5)O4 trigonal pyramid, and  an edgeedge with one La(4)O5 trigonal bipyramid. In the eighth La site, La(8) is bonded to one O(13), one O(16), one O(4), and one O(9) atom to form distorted LaO4 tetrahedra that share  a cornercorner with one Sr(1)O5 trigonal bipyramid,  a cornercorner with one La(3)O5 trigonal bipyramid,  a cornercorner with one La(4)O5 trigonal bipyramid, corners with two equivalent Sr(4)O5 trigonal bipyramids, and  an edgeedge with one La(5)O4 trigonal pyramid. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Sr(1), one Sr(2), one Sr(4), and one La(6) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Sr(2), one Sr(3), one La(3), and one La(4) atom. In the third O site, O(3) is bonded to one Sr(3), one Sr(5), one La(1), one La(2), and one La(3) atom to form OSr2La3 trigonal bipyramids that share  a cornercorner with one O(16)Sr2La2 tetrahedra, corners with two equivalent O(7)Sr3La2 trigonal bipyramids,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid,  an edgeedge with one O(9)SrLa3 tetrahedra,  an edgeedge with one O(12)Sr2La2 trigonal pyramid, and  an edgeedge with one O(6)Sr2La2 trigonal pyramid. In the fourth O site, O(4) is bonded to one Sr(3), one Sr(6), one La(4), and one La(8) atom to form distorted OSr2La2 trigonal pyramids that share  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(9)SrLa3 tetrahedra, corners with two equivalent O(14)Sr2La2 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  an edgeedge with one O(13)Sr2La2 trigonal pyramid, and  an edgeedge with one O(5)SrLa3 trigonal pyramid. In the fifth O site, O(5) is bonded to one Sr(6), one La(2), one La(4), and one La(6) atom to form distorted OSrLa3 trigonal pyramids that share corners with two equivalent O(14)Sr2La2 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(13)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid, and  an edgeedge with one O(4)Sr2La2 trigonal pyramid. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(3), one La(2), and one La(7) atom to form distorted OSr2La2 trigonal pyramids that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid, and  an edgeedge with one O(12)Sr2La2 trigonal pyramid. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(2), one Sr(5), one La(1), and one La(5) atom to form distorted OSr3La2 trigonal bipyramids that share  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(9)SrLa3 tetrahedra, corners with two equivalent O(3)Sr2La3 trigonal bipyramids,  a cornercorner with one O(13)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid,  an edgeedge with one O(16)Sr2La2 tetrahedra, and  an edgeedge with one O(12)Sr2La2 trigonal pyramid. In the eighth O site, O(8) is bonded to one Sr(2), one Sr(4), one La(3), and one La(6) atom to form distorted OSr2La2 trigonal pyramids that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(13)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid, and  an edgeedge with one O(9)SrLa3 tetrahedra. In the ninth O site, O(9) is bonded to one Sr(4), one La(1), one La(3), and one La(8) atom to form OSrLa3 tetrahedra that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid, corners with two equivalent O(13)Sr2La2 trigonal pyramids,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid, and  an edgeedge with one O(8)Sr2La2 trigonal pyramid. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(2), one La(2), one La(4), and one La(7) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one La(2), one La(5), and one La(7) atom. In the twelfth O site, O(12) is bonded to one Sr(3), one Sr(5), one La(1), and one La(7) atom to form OSr2La2 trigonal pyramids that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(9)SrLa3 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid,  an edgeedge with one O(7)Sr3La2 trigonal bipyramid, and  an edgeedge with one O(6)Sr2La2 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Sr(4), one Sr(6), one La(5), and one La(8) atom to form distorted OSr2La2 trigonal pyramids that share corners with two equivalent O(9)SrLa3 tetrahedra,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid,  an edgeedge with one O(14)Sr2La2 tetrahedra,  an edgeedge with one O(16)Sr2La2 tetrahedra, and  an edgeedge with one O(4)Sr2La2 trigonal pyramid. In the fourteenth O site, O(14) is bonded to one Sr(4), one Sr(6), one La(4), and one La(7) atom to form distorted OSr2La2 tetrahedra that share  a cornercorner with one O(9)SrLa3 tetrahedra,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid, corners with two equivalent O(4)Sr2La2 trigonal pyramids, corners with two equivalent O(5)SrLa3 trigonal pyramids, and  an edgeedge with one O(13)Sr2La2 trigonal pyramid. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(5), one La(1), one La(2), and one La(6) atom. In the sixteenth O site, O(16) is bonded to one Sr(1), one Sr(5), one La(5), and one La(8) atom to form OSr2La2 tetrahedra that share  a cornercorner with one O(9)SrLa3 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  an edgeedge with one O(7)Sr3La2 trigonal bipyramid, and  an edgeedge with one O(13)Sr2La2 trigonal pyramid. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(5), one La(2), one La(6), and one La(7) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one La(3), and one La(6) atom.
La4Sr3O9 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(15), one O(16), one O(6), and one O(7) atom to form distorted SrO5 trigonal bipyramids that share  a cornercorner with one La(7)O6 octahedra,  a cornercorner with one La(8)O4 tetrahedra,  a cornercorner with one Sr(4)O5 trigonal bipyramid, and corners with two equivalent La(5)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 81°. The Sr(1)-O(1) bond length is 2.42 Å. The Sr(1)-O(15) bond length is 2.58 Å. The Sr(1)-O(16) bond length is 2.54 Å. The Sr(1)-O(6) bond length is 2.67 Å. The Sr(1)-O(7) bond length is 2.67 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(15), one O(17), one O(2), one O(7), and one O(8) atom. The Sr(2)-O(1) bond length is 2.83 Å. The Sr(2)-O(10) bond length is 2.48 Å. The Sr(2)-O(15) bond length is 3.06 Å. The Sr(2)-O(17) bond length is 2.82 Å. The Sr(2)-O(2) bond length is 2.72 Å. The Sr(2)-O(7) bond length is 2.64 Å. The Sr(2)-O(8) bond length is 2.51 Å. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(12), one O(18), one O(2), one O(3), one O(4), and one O(6) atom. The Sr(3)-O(12) bond length is 2.42 Å. The Sr(3)-O(18) bond length is 3.16 Å. The Sr(3)-O(2) bond length is 2.78 Å. The Sr(3)-O(3) bond length is 2.61 Å. The Sr(3)-O(4) bond length is 2.49 Å. The Sr(3)-O(6) bond length is 2.86 Å. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(13), one O(14), one O(8), and one O(9) atom to form distorted SrO5 trigonal bipyramids that share  a cornercorner with one La(7)O6 octahedra, corners with two equivalent La(8)O4 tetrahedra,  a cornercorner with one Sr(1)O5 trigonal bipyramid,  a cornercorner with one La(4)O5 trigonal bipyramid,  a cornercorner with one La(5)O4 trigonal pyramid, and  an edgeedge with one La(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 38°. The Sr(4)-O(1) bond length is 2.43 Å. The Sr(4)-O(13) bond length is 2.62 Å. The Sr(4)-O(14) bond length is 2.51 Å. The Sr(4)-O(8) bond length is 2.58 Å. The Sr(4)-O(9) bond length is 2.75 Å. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one O(12), one O(15), one O(16), one O(17), one O(3), and one O(7) atom. The Sr(5)-O(12) bond length is 2.49 Å. The Sr(5)-O(15) bond length is 2.43 Å. The Sr(5)-O(16) bond length is 2.54 Å. The Sr(5)-O(17) bond length is 2.39 Å. The Sr(5)-O(3) bond length is 2.59 Å. The Sr(5)-O(7) bond length is 3.13 Å. In the sixth Sr site, Sr(6) is bonded in a 5-coordinate geometry to one O(13), one O(14), one O(18), one O(4), and one O(5) atom. The Sr(6)-O(13) bond length is 2.52 Å. The Sr(6)-O(14) bond length is 2.50 Å. The Sr(6)-O(18) bond length is 2.39 Å. The Sr(6)-O(4) bond length is 2.82 Å. The Sr(6)-O(5) bond length is 2.34 Å. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 5-coordinate geometry to one O(12), one O(15), one O(3), one O(7), and one O(9) atom. The La(1)-O(12) bond length is 2.32 Å. The La(1)-O(15) bond length is 2.31 Å. The La(1)-O(3) bond length is 2.56 Å. The La(1)-O(7) bond length is 2.40 Å. The La(1)-O(9) bond length is 2.43 Å. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(15), one O(17), one O(3), one O(5), and one O(6) atom. The La(2)-O(10) bond length is 2.48 Å. The La(2)-O(11) bond length is 2.32 Å. The La(2)-O(15) bond length is 2.99 Å. The La(2)-O(17) bond length is 3.10 Å. The La(2)-O(3) bond length is 2.77 Å. The La(2)-O(5) bond length is 2.29 Å. The La(2)-O(6) bond length is 2.37 Å. In the third La site, La(3) is bonded to one O(18), one O(2), one O(3), one O(8), and one O(9) atom to form distorted LaO5 trigonal bipyramids that share  a cornercorner with one La(8)O4 tetrahedra,  a cornercorner with one La(4)O5 trigonal bipyramid, and  an edgeedge with one Sr(4)O5 trigonal bipyramid. The La(3)-O(18) bond length is 2.24 Å. The La(3)-O(2) bond length is 2.31 Å. The La(3)-O(3) bond length is 2.52 Å. The La(3)-O(8) bond length is 2.34 Å. The La(3)-O(9) bond length is 2.50 Å. In the fourth La site, La(4) is bonded to one O(10), one O(14), one O(2), one O(4), and one O(5) atom to form LaO5 trigonal bipyramids that share  a cornercorner with one La(8)O4 tetrahedra,  a cornercorner with one Sr(4)O5 trigonal bipyramid,  a cornercorner with one La(3)O5 trigonal bipyramid, and  an edgeedge with one La(7)O6 octahedra. The La(4)-O(10) bond length is 2.39 Å. The La(4)-O(14) bond length is 2.32 Å. The La(4)-O(2) bond length is 2.32 Å. The La(4)-O(4) bond length is 2.42 Å. The La(4)-O(5) bond length is 2.29 Å. In the fifth La site, La(5) is bonded to one O(11), one O(13), one O(16), and one O(7) atom to form LaO4 trigonal pyramids that share  a cornercorner with one La(7)O6 octahedra,  a cornercorner with one Sr(4)O5 trigonal bipyramid, corners with two equivalent Sr(1)O5 trigonal bipyramids, and  an edgeedge with one La(8)O4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. The La(5)-O(11) bond length is 2.23 Å. The La(5)-O(13) bond length is 2.42 Å. The La(5)-O(16) bond length is 2.31 Å. The La(5)-O(7) bond length is 2.31 Å. In the sixth La site, La(6) is bonded in a 6-coordinate geometry to one O(1), one O(15), one O(17), one O(18), one O(5), and one O(8) atom. The La(6)-O(1) bond length is 2.35 Å. The La(6)-O(15) bond length is 2.58 Å. The La(6)-O(17) bond length is 2.36 Å. The La(6)-O(18) bond length is 2.47 Å. The La(6)-O(5) bond length is 3.05 Å. The La(6)-O(8) bond length is 2.38 Å. In the seventh La site, La(7) is bonded to one O(10), one O(11), one O(12), one O(14), one O(17), and one O(6) atom to form distorted LaO6 octahedra that share  a cornercorner with one Sr(1)O5 trigonal bipyramid,  a cornercorner with one Sr(4)O5 trigonal bipyramid,  a cornercorner with one La(5)O4 trigonal pyramid, and  an edgeedge with one La(4)O5 trigonal bipyramid. The La(7)-O(10) bond length is 2.31 Å. The La(7)-O(11) bond length is 2.50 Å. The La(7)-O(12) bond length is 2.50 Å. The La(7)-O(14) bond length is 2.63 Å. The La(7)-O(17) bond length is 2.42 Å. The La(7)-O(6) bond length is 2.48 Å. In the eighth La site, La(8) is bonded to one O(13), one O(16), one O(4), and one O(9) atom to form distorted LaO4 tetrahedra that share  a cornercorner with one Sr(1)O5 trigonal bipyramid,  a cornercorner with one La(3)O5 trigonal bipyramid,  a cornercorner with one La(4)O5 trigonal bipyramid, corners with two equivalent Sr(4)O5 trigonal bipyramids, and  an edgeedge with one La(5)O4 trigonal pyramid. The La(8)-O(13) bond length is 2.35 Å. The La(8)-O(16) bond length is 2.28 Å. The La(8)-O(4) bond length is 2.19 Å. The La(8)-O(9) bond length is 2.37 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Sr(1), one Sr(2), one Sr(4), and one La(6) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Sr(2), one Sr(3), one La(3), and one La(4) atom. In the third O site, O(3) is bonded to one Sr(3), one Sr(5), one La(1), one La(2), and one La(3) atom to form OSr2La3 trigonal bipyramids that share  a cornercorner with one O(16)Sr2La2 tetrahedra, corners with two equivalent O(7)Sr3La2 trigonal bipyramids,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid,  an edgeedge with one O(9)SrLa3 tetrahedra,  an edgeedge with one O(12)Sr2La2 trigonal pyramid, and  an edgeedge with one O(6)Sr2La2 trigonal pyramid. In the fourth O site, O(4) is bonded to one Sr(3), one Sr(6), one La(4), and one La(8) atom to form distorted OSr2La2 trigonal pyramids that share  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(9)SrLa3 tetrahedra, corners with two equivalent O(14)Sr2La2 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  an edgeedge with one O(13)Sr2La2 trigonal pyramid, and  an edgeedge with one O(5)SrLa3 trigonal pyramid. In the fifth O site, O(5) is bonded to one Sr(6), one La(2), one La(4), and one La(6) atom to form distorted OSrLa3 trigonal pyramids that share corners with two equivalent O(14)Sr2La2 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(13)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid, and  an edgeedge with one O(4)Sr2La2 trigonal pyramid. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(3), one La(2), and one La(7) atom to form distorted OSr2La2 trigonal pyramids that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid, and  an edgeedge with one O(12)Sr2La2 trigonal pyramid. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(2), one Sr(5), one La(1), and one La(5) atom to form distorted OSr3La2 trigonal bipyramids that share  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(9)SrLa3 tetrahedra, corners with two equivalent O(3)Sr2La3 trigonal bipyramids,  a cornercorner with one O(13)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid,  an edgeedge with one O(16)Sr2La2 tetrahedra, and  an edgeedge with one O(12)Sr2La2 trigonal pyramid. In the eighth O site, O(8) is bonded to one Sr(2), one Sr(4), one La(3), and one La(6) atom to form distorted OSr2La2 trigonal pyramids that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(13)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid, and  an edgeedge with one O(9)SrLa3 tetrahedra. In the ninth O site, O(9) is bonded to one Sr(4), one La(1), one La(3), and one La(8) atom to form OSrLa3 tetrahedra that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid, corners with two equivalent O(13)Sr2La2 trigonal pyramids,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid, and  an edgeedge with one O(8)Sr2La2 trigonal pyramid. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(2), one La(2), one La(4), and one La(7) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one La(2), one La(5), and one La(7) atom. In the twelfth O site, O(12) is bonded to one Sr(3), one Sr(5), one La(1), and one La(7) atom to form OSr2La2 trigonal pyramids that share  a cornercorner with one O(14)Sr2La2 tetrahedra,  a cornercorner with one O(16)Sr2La2 tetrahedra,  a cornercorner with one O(9)SrLa3 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid,  an edgeedge with one O(7)Sr3La2 trigonal bipyramid, and  an edgeedge with one O(6)Sr2La2 trigonal pyramid. In the thirteenth O site, O(13) is bonded to one Sr(4), one Sr(6), one La(5), and one La(8) atom to form distorted OSr2La2 trigonal pyramids that share corners with two equivalent O(9)SrLa3 tetrahedra,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid,  a cornercorner with one O(5)SrLa3 trigonal pyramid,  an edgeedge with one O(14)Sr2La2 tetrahedra,  an edgeedge with one O(16)Sr2La2 tetrahedra, and  an edgeedge with one O(4)Sr2La2 trigonal pyramid. In the fourteenth O site, O(14) is bonded to one Sr(4), one Sr(6), one La(4), and one La(7) atom to form distorted OSr2La2 tetrahedra that share  a cornercorner with one O(9)SrLa3 tetrahedra,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  a cornercorner with one O(8)Sr2La2 trigonal pyramid, corners with two equivalent O(4)Sr2La2 trigonal pyramids, corners with two equivalent O(5)SrLa3 trigonal pyramids, and  an edgeedge with one O(13)Sr2La2 trigonal pyramid. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(5), one La(1), one La(2), and one La(6) atom. In the sixteenth O site, O(16) is bonded to one Sr(1), one Sr(5), one La(5), and one La(8) atom to form OSr2La2 tetrahedra that share  a cornercorner with one O(9)SrLa3 tetrahedra,  a cornercorner with one O(3)Sr2La3 trigonal bipyramid,  a cornercorner with one O(7)Sr3La2 trigonal bipyramid,  a cornercorner with one O(12)Sr2La2 trigonal pyramid,  a cornercorner with one O(4)Sr2La2 trigonal pyramid,  a cornercorner with one O(6)Sr2La2 trigonal pyramid,  an edgeedge with one O(7)Sr3La2 trigonal bipyramid, and  an edgeedge with one O(13)Sr2La2 trigonal pyramid. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(5), one La(2), one La(6), and one La(7) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one La(3), and one La(6) atom.