BaSrLa4O8 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms. There are four inequivalent La sites. In the first La site, La(1) is bonded to one O(1), one O(5), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of distorted corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 51-67°. In the second La site, La(2) is bonded to one O(2), one O(6), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of distorted corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 52-68°. In the third La site, La(3) is bonded to one O(3), one O(7), two equivalent O(2), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 52-68°. In the fourth La site, La(4) is bonded to one O(4), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 51-67°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one La(1), and two equivalent La(4) atoms to form distorted OBa2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids, corners with two equivalent O(7)Sr2La3 square pyramids,  a cornercorner with one O(5)Sr2La3 trigonal bipyramid, corners with two equivalent O(6)Ba2La3 trigonal bipyramids, corners with four equivalent O(1)Ba2La3 trigonal bipyramids,  an edgeedge with one O(7)Sr2La3 square pyramid, edges with two equivalent O(8)Ba2La3 square pyramids, and edges with two equivalent O(6)Ba2La3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Sr(1), one La(2), and two equivalent La(3) atoms to form distorted OSr2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids, corners with two equivalent O(7)Sr2La3 square pyramids,  a cornercorner with one O(6)Ba2La3 trigonal bipyramid, corners with two equivalent O(5)Sr2La3 trigonal bipyramids, corners with four equivalent O(2)Sr2La3 trigonal bipyramids,  an edgeedge with one O(8)Ba2La3 square pyramid, edges with two equivalent O(7)Sr2La3 square pyramids, edges with two equivalent O(5)Sr2La3 trigonal bipyramids, and edges with four equivalent O(3)Sr2La3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one La(3), and two equivalent La(2) atoms to form distorted OSr2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids, corners with three equivalent O(7)Sr2La3 square pyramids, corners with two equivalent O(6)Ba2La3 trigonal bipyramids, corners with four equivalent O(5)Sr2La3 trigonal bipyramids,  an edgeedge with one O(7)Sr2La3 square pyramid, edges with two equivalent O(3)Sr2La3 trigonal bipyramids, edges with two equivalent O(5)Sr2La3 trigonal bipyramids, and edges with four equivalent O(2)Sr2La3 trigonal bipyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one La(4), and two equivalent La(1) atoms. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one La(1), and two equivalent La(2) atoms to form distorted OSr2La3 trigonal bipyramids that share corners with two equivalent O(7)Sr2La3 square pyramids,  a cornercorner with one O(1)Ba2La3 trigonal bipyramid, corners with two equivalent O(2)Sr2La3 trigonal bipyramids, corners with four equivalent O(3)Sr2La3 trigonal bipyramids,  an edgeedge with one O(7)Sr2La3 square pyramid, edges with two equivalent O(6)Ba2La3 trigonal bipyramids, edges with two equivalent O(2)Sr2La3 trigonal bipyramids, edges with two equivalent O(3)Sr2La3 trigonal bipyramids, and edges with two equivalent O(5)Sr2La3 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ba(1), one La(2), and two equivalent La(1) atoms to form distorted OBa2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids,  a cornercorner with one O(2)Sr2La3 trigonal bipyramid, corners with two equivalent O(1)Ba2La3 trigonal bipyramids, corners with two equivalent O(3)Sr2La3 trigonal bipyramids,  an edgeedge with one O(8)Ba2La3 square pyramid, edges with two equivalent O(1)Ba2La3 trigonal bipyramids, edges with two equivalent O(6)Ba2La3 trigonal bipyramids, and edges with two equivalent O(5)Sr2La3 trigonal bipyramids. In the seventh O site, O(7) is bonded to two equivalent Sr(1), one La(3), and two equivalent La(4) atoms to form distorted OSr2La3 square pyramids that share corners with two equivalent O(1)Ba2La3 trigonal bipyramids, corners with two equivalent O(2)Sr2La3 trigonal bipyramids, corners with two equivalent O(5)Sr2La3 trigonal bipyramids, corners with three equivalent O(3)Sr2La3 trigonal bipyramids, edges with two equivalent O(8)Ba2La3 square pyramids, edges with two equivalent O(7)Sr2La3 square pyramids,  an edgeedge with one O(1)Ba2La3 trigonal bipyramid,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid,  an edgeedge with one O(5)Sr2La3 trigonal bipyramid, and edges with two equivalent O(2)Sr2La3 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Ba(1), one La(4), and two equivalent La(3) atoms to form distorted OBa2La3 square pyramids that share corners with two equivalent O(1)Ba2La3 trigonal bipyramids, corners with two equivalent O(6)Ba2La3 trigonal bipyramids, corners with two equivalent O(2)Sr2La3 trigonal bipyramids, corners with two equivalent O(3)Sr2La3 trigonal bipyramids, edges with two equivalent O(8)Ba2La3 square pyramids, edges with two equivalent O(7)Sr2La3 square pyramids,  an edgeedge with one O(6)Ba2La3 trigonal bipyramid,  an edgeedge with one O(2)Sr2La3 trigonal bipyramid, and edges with two equivalent O(1)Ba2La3 trigonal bipyramids.
BaSrLa4O8 crystallizes in the orthorhombic Pmc2_1 space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms. There is one shorter (2.95 Å) and one longer (3.04 Å) Ba(1)-O(1) bond length. Both Ba(1)-O(4) bond lengths are 2.88 Å. Both Ba(1)-O(6) bond lengths are 2.82 Å. Both Ba(1)-O(8) bond lengths are 2.81 Å. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms. There is one shorter (2.94 Å) and one longer (3.03 Å) Sr(1)-O(2) bond length. Both Sr(1)-O(3) bond lengths are 2.78 Å. Both Sr(1)-O(5) bond lengths are 2.75 Å. Both Sr(1)-O(7) bond lengths are 2.74 Å. There are four inequivalent La sites. In the first La site, La(1) is bonded to one O(1), one O(5), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of distorted corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 51-67°. The La(1)-O(1) bond length is 2.43 Å. The La(1)-O(5) bond length is 2.40 Å. Both La(1)-O(4) bond lengths are 2.46 Å. Both La(1)-O(6) bond lengths are 2.49 Å. In the second La site, La(2) is bonded to one O(2), one O(6), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of distorted corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 52-68°. The La(2)-O(2) bond length is 2.34 Å. The La(2)-O(6) bond length is 2.39 Å. Both La(2)-O(3) bond lengths are 2.50 Å. Both La(2)-O(5) bond lengths are 2.52 Å. In the third La site, La(3) is bonded to one O(3), one O(7), two equivalent O(2), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 52-68°. The La(3)-O(3) bond length is 2.43 Å. The La(3)-O(7) bond length is 2.51 Å. Both La(3)-O(2) bond lengths are 2.33 Å. Both La(3)-O(8) bond lengths are 2.55 Å. In the fourth La site, La(4) is bonded to one O(4), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles range from 51-67°. The La(4)-O(4) bond length is 2.39 Å. The La(4)-O(8) bond length is 2.48 Å. Both La(4)-O(1) bond lengths are 2.35 Å. Both La(4)-O(7) bond lengths are 2.57 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one La(1), and two equivalent La(4) atoms to form distorted OBa2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids, corners with two equivalent O(7)Sr2La3 square pyramids,  a cornercorner with one O(5)Sr2La3 trigonal bipyramid, corners with two equivalent O(6)Ba2La3 trigonal bipyramids, corners with four equivalent O(1)Ba2La3 trigonal bipyramids,  an edgeedge with one O(7)Sr2La3 square pyramid, edges with two equivalent O(8)Ba2La3 square pyramids, and edges with two equivalent O(6)Ba2La3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Sr(1), one La(2), and two equivalent La(3) atoms to form distorted OSr2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids, corners with two equivalent O(7)Sr2La3 square pyramids,  a cornercorner with one O(6)Ba2La3 trigonal bipyramid, corners with two equivalent O(5)Sr2La3 trigonal bipyramids, corners with four equivalent O(2)Sr2La3 trigonal bipyramids,  an edgeedge with one O(8)Ba2La3 square pyramid, edges with two equivalent O(7)Sr2La3 square pyramids, edges with two equivalent O(5)Sr2La3 trigonal bipyramids, and edges with four equivalent O(3)Sr2La3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Sr(1), one La(3), and two equivalent La(2) atoms to form distorted OSr2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids, corners with three equivalent O(7)Sr2La3 square pyramids, corners with two equivalent O(6)Ba2La3 trigonal bipyramids, corners with four equivalent O(5)Sr2La3 trigonal bipyramids,  an edgeedge with one O(7)Sr2La3 square pyramid, edges with two equivalent O(3)Sr2La3 trigonal bipyramids, edges with two equivalent O(5)Sr2La3 trigonal bipyramids, and edges with four equivalent O(2)Sr2La3 trigonal bipyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one La(4), and two equivalent La(1) atoms. In the fifth O site, O(5) is bonded to two equivalent Sr(1), one La(1), and two equivalent La(2) atoms to form distorted OSr2La3 trigonal bipyramids that share corners with two equivalent O(7)Sr2La3 square pyramids,  a cornercorner with one O(1)Ba2La3 trigonal bipyramid, corners with two equivalent O(2)Sr2La3 trigonal bipyramids, corners with four equivalent O(3)Sr2La3 trigonal bipyramids,  an edgeedge with one O(7)Sr2La3 square pyramid, edges with two equivalent O(6)Ba2La3 trigonal bipyramids, edges with two equivalent O(2)Sr2La3 trigonal bipyramids, edges with two equivalent O(3)Sr2La3 trigonal bipyramids, and edges with two equivalent O(5)Sr2La3 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ba(1), one La(2), and two equivalent La(1) atoms to form distorted OBa2La3 trigonal bipyramids that share corners with two equivalent O(8)Ba2La3 square pyramids,  a cornercorner with one O(2)Sr2La3 trigonal bipyramid, corners with two equivalent O(1)Ba2La3 trigonal bipyramids, corners with two equivalent O(3)Sr2La3 trigonal bipyramids,  an edgeedge with one O(8)Ba2La3 square pyramid, edges with two equivalent O(1)Ba2La3 trigonal bipyramids, edges with two equivalent O(6)Ba2La3 trigonal bipyramids, and edges with two equivalent O(5)Sr2La3 trigonal bipyramids. In the seventh O site, O(7) is bonded to two equivalent Sr(1), one La(3), and two equivalent La(4) atoms to form distorted OSr2La3 square pyramids that share corners with two equivalent O(1)Ba2La3 trigonal bipyramids, corners with two equivalent O(2)Sr2La3 trigonal bipyramids, corners with two equivalent O(5)Sr2La3 trigonal bipyramids, corners with three equivalent O(3)Sr2La3 trigonal bipyramids, edges with two equivalent O(8)Ba2La3 square pyramids, edges with two equivalent O(7)Sr2La3 square pyramids,  an edgeedge with one O(1)Ba2La3 trigonal bipyramid,  an edgeedge with one O(3)Sr2La3 trigonal bipyramid,  an edgeedge with one O(5)Sr2La3 trigonal bipyramid, and edges with two equivalent O(2)Sr2La3 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Ba(1), one La(4), and two equivalent La(3) atoms to form distorted OBa2La3 square pyramids that share corners with two equivalent O(1)Ba2La3 trigonal bipyramids, corners with two equivalent O(6)Ba2La3 trigonal bipyramids, corners with two equivalent O(2)Sr2La3 trigonal bipyramids, corners with two equivalent O(3)Sr2La3 trigonal bipyramids, edges with two equivalent O(8)Ba2La3 square pyramids, edges with two equivalent O(7)Sr2La3 square pyramids,  an edgeedge with one O(6)Ba2La3 trigonal bipyramid,  an edgeedge with one O(2)Sr2La3 trigonal bipyramid, and edges with two equivalent O(1)Ba2La3 trigonal bipyramids.