BaSrNd4O8 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 Nd sites. In the first Nd site, Nd(1) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(8) atoms to form a mixture of edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 52-66°. In the second Nd site, Nd(2) is bonded to one O(6), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-65°. In the third Nd site, Nd(3) is bonded to one O(1), one O(3), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of distorted edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-65°. In the fourth Nd site, Nd(4) is bonded to one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 52-66°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one Nd(3), and two equivalent Nd(2) atoms to form distorted OBa2Nd3 trigonal bipyramids that share corners with two equivalent O(8)Ba2Nd3 square pyramids, corners with two equivalent O(7)Sr2Nd3 square pyramids,  a cornercorner with one O(3)Sr2Nd3 trigonal bipyramid, corners with two equivalent O(4)Ba2Nd3 trigonal bipyramids, corners with four equivalent O(1)Ba2Nd3 trigonal bipyramids,  an edgeedge with one O(7)Sr2Nd3 square pyramid, edges with two equivalent O(8)Ba2Nd3 square pyramids, and edges with two equivalent O(4)Ba2Nd3 trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Nd(4), and two equivalent Nd(1) atoms. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nd(3), and two equivalent Nd(4) atoms to form distorted OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd3 square pyramids,  a cornercorner with one O(1)Ba2Nd3 trigonal bipyramid,  an edgeedge with one O(7)Sr2Nd3 square pyramid, edges with two equivalent O(4)Ba2Nd3 trigonal bipyramids, and edges with two equivalent O(3)Sr2Nd3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Nd(4), and two equivalent Nd(3) atoms to form distorted OBa2Nd3 trigonal bipyramids that share corners with two equivalent O(8)Ba2Nd3 square pyramids, corners with two equivalent O(1)Ba2Nd3 trigonal bipyramids,  an edgeedge with one O(8)Ba2Nd3 square pyramid, edges with two equivalent O(1)Ba2Nd3 trigonal bipyramids, edges with two equivalent O(4)Ba2Nd3 trigonal bipyramids, and edges with two equivalent O(3)Sr2Nd3 trigonal bipyramids. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Nd(1), and two equivalent Nd(4) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Nd(2), and two equivalent Nd(3) atoms. In the seventh O site, O(7) is bonded to two equivalent Sr(1), one Nd(1), and two equivalent Nd(2) atoms to form distorted OSr2Nd3 square pyramids that share corners with two equivalent O(1)Ba2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd3 trigonal bipyramids, edges with two equivalent O(8)Ba2Nd3 square pyramids, edges with two equivalent O(7)Sr2Nd3 square pyramids,  an edgeedge with one O(1)Ba2Nd3 trigonal bipyramid, and  an edgeedge with one O(3)Sr2Nd3 trigonal bipyramid. In the eighth O site, O(8) is bonded to two equivalent Ba(1), one Nd(2), and two equivalent Nd(1) atoms to form OBa2Nd3 square pyramids that share corners with two equivalent O(1)Ba2Nd3 trigonal bipyramids, corners with two equivalent O(4)Ba2Nd3 trigonal bipyramids, edges with two equivalent O(8)Ba2Nd3 square pyramids, edges with two equivalent O(7)Sr2Nd3 square pyramids,  an edgeedge with one O(4)Ba2Nd3 trigonal bipyramid, and edges with two equivalent O(1)Ba2Nd3 trigonal bipyramids.
BaSrNd4O8 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 (2.91 Å) and one longer (3.01 Å) Ba(1)-O(1) bond length. Both Ba(1)-O(4) bond lengths are 2.79 Å. Both Ba(1)-O(6) bond lengths are 2.90 Å. Both Ba(1)-O(8) bond lengths are 2.80 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 (2.90 Å) and one longer (3.01 Å) Sr(1)-O(2) bond length. Both Sr(1)-O(3) bond lengths are 2.70 Å. Both Sr(1)-O(5) bond lengths are 2.82 Å. Both Sr(1)-O(7) bond lengths are 2.71 Å. There are four inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(5), one O(7), two equivalent O(2), and two equivalent O(8) atoms to form a mixture of edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 52-66°. The Nd(1)-O(5) bond length is 2.39 Å. The Nd(1)-O(7) bond length is 2.46 Å. Both Nd(1)-O(2) bond lengths are 2.30 Å. Both Nd(1)-O(8) bond lengths are 2.50 Å. In the second Nd site, Nd(2) is bonded to one O(6), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-65°. The Nd(2)-O(6) bond length is 2.36 Å. The Nd(2)-O(8) bond length is 2.43 Å. Both Nd(2)-O(1) bond lengths are 2.33 Å. Both Nd(2)-O(7) bond lengths are 2.52 Å. In the third Nd site, Nd(3) is bonded to one O(1), one O(3), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of distorted edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 51-65°. The Nd(3)-O(1) bond length is 2.43 Å. The Nd(3)-O(3) bond length is 2.37 Å. Both Nd(3)-O(4) bond lengths are 2.44 Å. Both Nd(3)-O(6) bond lengths are 2.41 Å. In the fourth Nd site, Nd(4) is bonded to one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles range from 52-66°. The Nd(4)-O(2) bond length is 2.32 Å. The Nd(4)-O(4) bond length is 2.36 Å. Both Nd(4)-O(3) bond lengths are 2.48 Å. Both Nd(4)-O(5) bond lengths are 2.43 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one Nd(3), and two equivalent Nd(2) atoms to form distorted OBa2Nd3 trigonal bipyramids that share corners with two equivalent O(8)Ba2Nd3 square pyramids, corners with two equivalent O(7)Sr2Nd3 square pyramids,  a cornercorner with one O(3)Sr2Nd3 trigonal bipyramid, corners with two equivalent O(4)Ba2Nd3 trigonal bipyramids, corners with four equivalent O(1)Ba2Nd3 trigonal bipyramids,  an edgeedge with one O(7)Sr2Nd3 square pyramid, edges with two equivalent O(8)Ba2Nd3 square pyramids, and edges with two equivalent O(4)Ba2Nd3 trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Nd(4), and two equivalent Nd(1) atoms. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nd(3), and two equivalent Nd(4) atoms to form distorted OSr2Nd3 trigonal bipyramids that share corners with two equivalent O(7)Sr2Nd3 square pyramids,  a cornercorner with one O(1)Ba2Nd3 trigonal bipyramid,  an edgeedge with one O(7)Sr2Nd3 square pyramid, edges with two equivalent O(4)Ba2Nd3 trigonal bipyramids, and edges with two equivalent O(3)Sr2Nd3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Ba(1), one Nd(4), and two equivalent Nd(3) atoms to form distorted OBa2Nd3 trigonal bipyramids that share corners with two equivalent O(8)Ba2Nd3 square pyramids, corners with two equivalent O(1)Ba2Nd3 trigonal bipyramids,  an edgeedge with one O(8)Ba2Nd3 square pyramid, edges with two equivalent O(1)Ba2Nd3 trigonal bipyramids, edges with two equivalent O(4)Ba2Nd3 trigonal bipyramids, and edges with two equivalent O(3)Sr2Nd3 trigonal bipyramids. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Nd(1), and two equivalent Nd(4) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Nd(2), and two equivalent Nd(3) atoms. In the seventh O site, O(7) is bonded to two equivalent Sr(1), one Nd(1), and two equivalent Nd(2) atoms to form distorted OSr2Nd3 square pyramids that share corners with two equivalent O(1)Ba2Nd3 trigonal bipyramids, corners with two equivalent O(3)Sr2Nd3 trigonal bipyramids, edges with two equivalent O(8)Ba2Nd3 square pyramids, edges with two equivalent O(7)Sr2Nd3 square pyramids,  an edgeedge with one O(1)Ba2Nd3 trigonal bipyramid, and  an edgeedge with one O(3)Sr2Nd3 trigonal bipyramid. In the eighth O site, O(8) is bonded to two equivalent Ba(1), one Nd(2), and two equivalent Nd(1) atoms to form OBa2Nd3 square pyramids that share corners with two equivalent O(1)Ba2Nd3 trigonal bipyramids, corners with two equivalent O(4)Ba2Nd3 trigonal bipyramids, edges with two equivalent O(8)Ba2Nd3 square pyramids, edges with two equivalent O(7)Sr2Nd3 square pyramids,  an edgeedge with one O(4)Ba2Nd3 trigonal bipyramid, and edges with two equivalent O(1)Ba2Nd3 trigonal bipyramids.