Sr3NdTaAl3O12 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(14), one O(21), one O(23), one O(3), one O(6), and two equivalent O(17) atoms. In the second Sr site, Sr(2) is bonded to one O(1), one O(12), one O(15), one O(16), one O(21), one O(23), one O(3), one O(7), one O(8), one O(9), and two equivalent O(19) atoms to form SrO12 cuboctahedra that share corners with two equivalent Sr(2)O12 cuboctahedra, corners with four equivalent Sr(3)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra, faces with two equivalent Sr(6)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Al(3)O6 octahedra,  a faceface with one Al(4)O6 octahedra,  a faceface with one Al(6)O6 octahedra, faces with two equivalent Al(2)O6 octahedra, and faces with two equivalent Al(5)O6 octahedra. In the third Sr site, Sr(3) is bonded to one O(10), one O(11), one O(15), one O(16), one O(2), one O(22), one O(24), one O(4), one O(7), one O(8), and two equivalent O(20) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(3)O12 cuboctahedra, corners with four equivalent Sr(2)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, faces with two equivalent Sr(5)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(5)O6 octahedra, faces with two equivalent Al(3)O6 octahedra, and faces with two equivalent Al(4)O6 octahedra. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(13), one O(15), one O(18), one O(19), one O(2), one O(21), one O(22), one O(5), one O(7), and two equivalent O(9) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(4)O12 cuboctahedra, corners with two equivalent Sr(6)O12 cuboctahedra, corners with four equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(5)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, and faces with two equivalent Al(4)O6 octahedra. In the fifth Sr site, Sr(5) is bonded to one O(1), one O(14), one O(16), one O(17), one O(2), one O(20), one O(21), one O(22), one O(6), one O(8), and two equivalent O(10) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(5)O12 cuboctahedra, corners with four equivalent Sr(4)O12 cuboctahedra, corners with four equivalent Sr(6)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Al(3)O6 octahedra,  a faceface with one Al(4)O6 octahedra,  a faceface with one Al(6)O6 octahedra, faces with two equivalent Al(1)O6 octahedra, and faces with two equivalent Al(5)O6 octahedra. In the sixth Sr site, Sr(6) is bonded to one O(14), one O(16), one O(18), one O(19), one O(23), one O(24), one O(3), one O(4), one O(6), one O(8), and two equivalent O(12) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(4)O12 cuboctahedra, corners with two equivalent Sr(6)O12 cuboctahedra, corners with four equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(5)O6 octahedra, faces with two equivalent Al(3)O6 octahedra, and faces with two equivalent Al(6)O6 octahedra. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 12-coordinate geometry to one O(12), one O(13), one O(14), one O(2), one O(22), one O(24), one O(4), one O(5), one O(6), one O(9), and two equivalent O(18) atoms. In the second Nd site, Nd(2) is bonded in a 11-coordinate geometry to one O(15), one O(17), one O(20), one O(23), one O(24), one O(3), one O(4), one O(5), one O(7), and two equivalent O(11) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(13), one O(17), one O(21), one O(5), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Al(4)O6 octahedra,  a cornercorner with one Al(6)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-21°. In the second Ta site, Ta(2) is bonded to one O(11), one O(13), one O(18), one O(24), one O(4), and one O(5) atom to form TaO6 octahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, and  a faceface with one Sr(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-21°. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(14), one O(18), one O(2), one O(22), and one O(6) atom to form AlO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Al(5)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, corners with two equivalent Al(6)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-10°. In the second Al site, Al(2) is bonded to one O(11), one O(15), one O(19), one O(23), one O(3), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Al(5)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, corners with two equivalent Al(6)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-11°. In the third Al site, Al(3) is bonded to one O(12), one O(16), one O(20), one O(24), one O(4), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(4)O6 octahedra,  a cornercorner with one Al(6)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-19°. In the fourth Al site, Al(4) is bonded to one O(15), one O(2), one O(20), one O(22), one O(7), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-10°. In the fifth Al site, Al(5) is bonded to one O(1), one O(10), one O(16), one O(19), one O(21), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 3-12°. In the sixth Al site, Al(6) is bonded to one O(12), one O(14), one O(17), one O(23), one O(3), and one O(6) atom to form AlO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, and faces with two equivalent Sr(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-13°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(5), one Ta(1), and one Al(5) atom. In the second O site, O(2) is bonded to one Sr(3), one Sr(4), one Sr(5), one Nd(1), one Al(1), and one Al(4) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(22)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 5-60°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(6), one Nd(2), one Al(2), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(19)Sr4Al2 octahedra, and faces with two equivalent O(23)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(3), one Sr(6), one Nd(1), one Nd(2), one Ta(2), and one Al(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Sr(4), one Nd(1), one Nd(2), one Ta(1), and one Ta(2) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(5), one Sr(6), one Nd(1), one Al(1), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(22)Sr3NdAl2 octahedra,  an edgeedge with one O(23)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(2)Sr3NdAl2 octahedra,  a faceface with one O(3)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(14)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-62°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Nd(2), one Al(2), and one Al(4) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Al(3), and one Al(5) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Sr(2), two equivalent Sr(4), one Nd(1), one Ta(1), and one Al(4) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(3), two equivalent Sr(5), one Al(1), and one Al(5) atom to form distorted OSr4Al2 octahedra that share  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra, corners with two equivalent O(10)Sr4Al2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(2)Sr3NdAl2 octahedra,  a faceface with one O(22)Sr3NdAl2 octahedra, and  a faceface with one O(6)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 1-61°. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), two equivalent Nd(2), one Ta(2), and one Al(2) atom. In the twelfth O site, O(12) is bonded to one Sr(2), two equivalent Sr(6), one Nd(1), one Al(3), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra, corners with two equivalent O(12)Sr3NdAl2 octahedra, edges with two equivalent O(19)Sr4Al2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(23)Sr3NdAl2 octahedra,  a faceface with one O(3)Sr3NdAl2 octahedra, and  a faceface with one O(6)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 11-62°. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(4), one Nd(1), one Ta(1), and one Ta(2) atom. In the fourteenth O site, O(14) is bonded to one Sr(1), one Sr(5), one Sr(6), one Nd(1), one Al(1), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(2)Sr3NdAl2 octahedra,  an edgeedge with one O(3)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(22)Sr3NdAl2 octahedra,  a faceface with one O(23)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(6)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-62°. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Nd(2), one Al(2), and one Al(4) atom. In the sixteenth O site, O(16) is bonded in a distorted linear geometry to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Al(3), and one Al(5) atom. In the seventeenth O site, O(17) is bonded in a 2-coordinate geometry to one Sr(5), two equivalent Sr(1), one Nd(2), one Ta(1), and one Al(6) atom. In the eighteenth O site, O(18) is bonded in a 2-coordinate geometry to one Sr(4), one Sr(6), two equivalent Nd(1), one Ta(2), and one Al(1) atom. In the nineteenth O site, O(19) is bonded to one Sr(4), one Sr(6), two equivalent Sr(2), one Al(2), and one Al(5) atom to form distorted OSr4Al2 octahedra that share  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra, corners with two equivalent O(19)Sr4Al2 octahedra, edges with two equivalent O(12)Sr3NdAl2 octahedra,  a faceface with one O(23)Sr3NdAl2 octahedra, and  a faceface with one O(3)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 3-58°. In the twentieth O site, O(20) is bonded in a distorted linear geometry to one Sr(5), two equivalent Sr(3), one Nd(2), one Al(3), and one Al(4) atom. In the twenty-first O site, O(21) is bonded in a distorted linear geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(5), one Ta(1), and one Al(5) atom. In the twenty-second O site, O(22) is bonded to one Sr(3), one Sr(4), one Sr(5), one Nd(1), one Al(1), and one Al(4) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(2)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 5-60°. In the twenty-third O site, O(23) is bonded to one Sr(1), one Sr(2), one Sr(6), one Nd(2), one Al(2), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(19)Sr4Al2 octahedra, and faces with two equivalent O(3)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-57°. In the twenty-fourth O site, O(24) is bonded in a 2-coordinate geometry to one Sr(3), one Sr(6), one Nd(1), one Nd(2), one Ta(2), and one Al(3) atom.
Sr3NdTaAl3O12 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(14), one O(21), one O(23), one O(3), one O(6), and two equivalent O(17) atoms. The Sr(1)-O(1) bond length is 2.67 Å. The Sr(1)-O(10) bond length is 2.73 Å. The Sr(1)-O(11) bond length is 2.68 Å. The Sr(1)-O(13) bond length is 2.84 Å. The Sr(1)-O(14) bond length is 2.61 Å. The Sr(1)-O(21) bond length is 2.85 Å. The Sr(1)-O(23) bond length is 2.73 Å. The Sr(1)-O(3) bond length is 2.73 Å. The Sr(1)-O(6) bond length is 2.57 Å. There is one shorter (2.75 Å) and one longer (2.76 Å) Sr(1)-O(17) bond length. In the second Sr site, Sr(2) is bonded to one O(1), one O(12), one O(15), one O(16), one O(21), one O(23), one O(3), one O(7), one O(8), one O(9), and two equivalent O(19) atoms to form SrO12 cuboctahedra that share corners with two equivalent Sr(2)O12 cuboctahedra, corners with four equivalent Sr(3)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra, faces with two equivalent Sr(6)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Al(3)O6 octahedra,  a faceface with one Al(4)O6 octahedra,  a faceface with one Al(6)O6 octahedra, faces with two equivalent Al(2)O6 octahedra, and faces with two equivalent Al(5)O6 octahedra. The Sr(2)-O(1) bond length is 2.96 Å. The Sr(2)-O(12) bond length is 2.78 Å. The Sr(2)-O(15) bond length is 2.85 Å. The Sr(2)-O(16) bond length is 2.74 Å. The Sr(2)-O(21) bond length is 2.75 Å. The Sr(2)-O(23) bond length is 2.66 Å. The Sr(2)-O(3) bond length is 2.64 Å. The Sr(2)-O(7) bond length is 2.87 Å. The Sr(2)-O(8) bond length is 2.62 Å. The Sr(2)-O(9) bond length is 2.71 Å. There is one shorter (2.73 Å) and one longer (2.76 Å) Sr(2)-O(19) bond length. In the third Sr site, Sr(3) is bonded to one O(10), one O(11), one O(15), one O(16), one O(2), one O(22), one O(24), one O(4), one O(7), one O(8), and two equivalent O(20) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(3)O12 cuboctahedra, corners with four equivalent Sr(2)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, faces with two equivalent Sr(5)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(5)O6 octahedra, faces with two equivalent Al(3)O6 octahedra, and faces with two equivalent Al(4)O6 octahedra. The Sr(3)-O(10) bond length is 2.58 Å. The Sr(3)-O(11) bond length is 3.01 Å. The Sr(3)-O(15) bond length is 2.72 Å. The Sr(3)-O(16) bond length is 2.68 Å. The Sr(3)-O(2) bond length is 2.78 Å. The Sr(3)-O(22) bond length is 2.75 Å. The Sr(3)-O(24) bond length is 2.96 Å. The Sr(3)-O(4) bond length is 2.64 Å. The Sr(3)-O(7) bond length is 2.69 Å. The Sr(3)-O(8) bond length is 2.82 Å. Both Sr(3)-O(20) bond lengths are 2.74 Å. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(13), one O(15), one O(18), one O(19), one O(2), one O(21), one O(22), one O(5), one O(7), and two equivalent O(9) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(4)O12 cuboctahedra, corners with two equivalent Sr(6)O12 cuboctahedra, corners with four equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(5)O6 octahedra, faces with two equivalent Ta(1)O6 octahedra, and faces with two equivalent Al(4)O6 octahedra. The Sr(4)-O(1) bond length is 2.78 Å. The Sr(4)-O(13) bond length is 2.62 Å. The Sr(4)-O(15) bond length is 2.70 Å. The Sr(4)-O(18) bond length is 3.03 Å. The Sr(4)-O(19) bond length is 2.61 Å. The Sr(4)-O(2) bond length is 2.65 Å. The Sr(4)-O(21) bond length is 2.98 Å. The Sr(4)-O(22) bond length is 2.62 Å. The Sr(4)-O(5) bond length is 3.03 Å. The Sr(4)-O(7) bond length is 2.67 Å. There is one shorter (2.73 Å) and one longer (2.75 Å) Sr(4)-O(9) bond length. In the fifth Sr site, Sr(5) is bonded to one O(1), one O(14), one O(16), one O(17), one O(2), one O(20), one O(21), one O(22), one O(6), one O(8), and two equivalent O(10) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(5)O12 cuboctahedra, corners with four equivalent Sr(4)O12 cuboctahedra, corners with four equivalent Sr(6)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra,  a faceface with one Ta(1)O6 octahedra,  a faceface with one Al(3)O6 octahedra,  a faceface with one Al(4)O6 octahedra,  a faceface with one Al(6)O6 octahedra, faces with two equivalent Al(1)O6 octahedra, and faces with two equivalent Al(5)O6 octahedra. The Sr(5)-O(1) bond length is 2.86 Å. The Sr(5)-O(14) bond length is 2.73 Å. The Sr(5)-O(16) bond length is 2.80 Å. The Sr(5)-O(17) bond length is 3.05 Å. The Sr(5)-O(2) bond length is 2.73 Å. The Sr(5)-O(20) bond length is 2.62 Å. The Sr(5)-O(21) bond length is 2.65 Å. The Sr(5)-O(22) bond length is 2.75 Å. The Sr(5)-O(6) bond length is 2.75 Å. The Sr(5)-O(8) bond length is 2.66 Å. Both Sr(5)-O(10) bond lengths are 2.74 Å. In the sixth Sr site, Sr(6) is bonded to one O(14), one O(16), one O(18), one O(19), one O(23), one O(24), one O(3), one O(4), one O(6), one O(8), and two equivalent O(12) atoms to form distorted SrO12 cuboctahedra that share corners with two equivalent Sr(4)O12 cuboctahedra, corners with two equivalent Sr(6)O12 cuboctahedra, corners with four equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra,  a faceface with one Ta(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(5)O6 octahedra, faces with two equivalent Al(3)O6 octahedra, and faces with two equivalent Al(6)O6 octahedra. The Sr(6)-O(14) bond length is 2.82 Å. The Sr(6)-O(16) bond length is 2.65 Å. The Sr(6)-O(18) bond length is 2.68 Å. The Sr(6)-O(19) bond length is 2.68 Å. The Sr(6)-O(23) bond length is 2.64 Å. The Sr(6)-O(24) bond length is 3.12 Å. The Sr(6)-O(3) bond length is 2.68 Å. The Sr(6)-O(4) bond length is 2.78 Å. The Sr(6)-O(6) bond length is 2.81 Å. The Sr(6)-O(8) bond length is 2.77 Å. There is one shorter (2.74 Å) and one longer (2.76 Å) Sr(6)-O(12) bond length. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 12-coordinate geometry to one O(12), one O(13), one O(14), one O(2), one O(22), one O(24), one O(4), one O(5), one O(6), one O(9), and two equivalent O(18) atoms. The Nd(1)-O(12) bond length is 2.53 Å. The Nd(1)-O(13) bond length is 3.07 Å. The Nd(1)-O(14) bond length is 2.48 Å. The Nd(1)-O(2) bond length is 2.48 Å. The Nd(1)-O(22) bond length is 2.51 Å. The Nd(1)-O(24) bond length is 2.83 Å. The Nd(1)-O(4) bond length is 3.11 Å. The Nd(1)-O(5) bond length is 2.63 Å. The Nd(1)-O(6) bond length is 2.52 Å. The Nd(1)-O(9) bond length is 2.99 Å. There is one shorter (2.73 Å) and one longer (2.77 Å) Nd(1)-O(18) bond length. In the second Nd site, Nd(2) is bonded in a 11-coordinate geometry to one O(15), one O(17), one O(20), one O(23), one O(24), one O(3), one O(4), one O(5), one O(7), and two equivalent O(11) atoms. The Nd(2)-O(15) bond length is 2.41 Å. The Nd(2)-O(17) bond length is 2.62 Å. The Nd(2)-O(20) bond length is 2.73 Å. The Nd(2)-O(23) bond length is 2.59 Å. The Nd(2)-O(24) bond length is 2.66 Å. The Nd(2)-O(3) bond length is 2.56 Å. The Nd(2)-O(4) bond length is 2.96 Å. The Nd(2)-O(5) bond length is 2.91 Å. The Nd(2)-O(7) bond length is 2.44 Å. There is one shorter (2.73 Å) and one longer (2.78 Å) Nd(2)-O(11) bond length. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(13), one O(17), one O(21), one O(5), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Al(4)O6 octahedra,  a cornercorner with one Al(6)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-21°. The Ta(1)-O(1) bond length is 1.94 Å. The Ta(1)-O(13) bond length is 2.04 Å. The Ta(1)-O(17) bond length is 1.99 Å. The Ta(1)-O(21) bond length is 1.93 Å. The Ta(1)-O(5) bond length is 2.03 Å. The Ta(1)-O(9) bond length is 1.97 Å. In the second Ta site, Ta(2) is bonded to one O(11), one O(13), one O(18), one O(24), one O(4), and one O(5) atom to form TaO6 octahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, and  a faceface with one Sr(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-21°. The Ta(2)-O(11) bond length is 1.98 Å. The Ta(2)-O(13) bond length is 2.00 Å. The Ta(2)-O(18) bond length is 1.98 Å. The Ta(2)-O(24) bond length is 1.95 Å. The Ta(2)-O(4) bond length is 1.93 Å. The Ta(2)-O(5) bond length is 2.04 Å. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(14), one O(18), one O(2), one O(22), and one O(6) atom to form AlO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Al(5)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, corners with two equivalent Al(6)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-10°. The Al(1)-O(10) bond length is 1.89 Å. The Al(1)-O(14) bond length is 1.96 Å. The Al(1)-O(18) bond length is 1.94 Å. The Al(1)-O(2) bond length is 1.95 Å. The Al(1)-O(22) bond length is 1.95 Å. The Al(1)-O(6) bond length is 1.95 Å. In the second Al site, Al(2) is bonded to one O(11), one O(15), one O(19), one O(23), one O(3), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Al(5)O6 octahedra, corners with two equivalent Al(4)O6 octahedra, corners with two equivalent Al(6)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-11°. The Al(2)-O(11) bond length is 1.98 Å. The Al(2)-O(15) bond length is 1.95 Å. The Al(2)-O(19) bond length is 1.91 Å. The Al(2)-O(23) bond length is 1.92 Å. The Al(2)-O(3) bond length is 1.93 Å. The Al(2)-O(7) bond length is 1.95 Å. In the third Al site, Al(3) is bonded to one O(12), one O(16), one O(20), one O(24), one O(4), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(4)O6 octahedra,  a cornercorner with one Al(6)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Al(5)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-19°. The Al(3)-O(12) bond length is 1.95 Å. The Al(3)-O(16) bond length is 1.90 Å. The Al(3)-O(20) bond length is 1.94 Å. The Al(3)-O(24) bond length is 1.96 Å. The Al(3)-O(4) bond length is 1.91 Å. The Al(3)-O(8) bond length is 1.92 Å. In the fourth Al site, Al(4) is bonded to one O(15), one O(2), one O(20), one O(22), one O(7), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-10°. The Al(4)-O(15) bond length is 1.96 Å. The Al(4)-O(2) bond length is 1.95 Å. The Al(4)-O(20) bond length is 1.90 Å. The Al(4)-O(22) bond length is 1.95 Å. The Al(4)-O(7) bond length is 1.97 Å. The Al(4)-O(9) bond length is 1.91 Å. In the fifth Al site, Al(5) is bonded to one O(1), one O(10), one O(16), one O(19), one O(21), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Al(3)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(6)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 3-12°. The Al(5)-O(1) bond length is 1.96 Å. The Al(5)-O(10) bond length is 1.93 Å. The Al(5)-O(16) bond length is 1.93 Å. The Al(5)-O(19) bond length is 1.94 Å. The Al(5)-O(21) bond length is 1.92 Å. The Al(5)-O(8) bond length is 1.90 Å. In the sixth Al site, Al(6) is bonded to one O(12), one O(14), one O(17), one O(23), one O(3), and one O(6) atom to form AlO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Al(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, and faces with two equivalent Sr(6)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-13°. The Al(6)-O(12) bond length is 1.95 Å. The Al(6)-O(14) bond length is 1.94 Å. The Al(6)-O(17) bond length is 1.97 Å. The Al(6)-O(23) bond length is 1.92 Å. The Al(6)-O(3) bond length is 1.92 Å. The Al(6)-O(6) bond length is 1.93 Å. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(5), one Ta(1), and one Al(5) atom. In the second O site, O(2) is bonded to one Sr(3), one Sr(4), one Sr(5), one Nd(1), one Al(1), and one Al(4) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(22)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 5-60°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(6), one Nd(2), one Al(2), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(19)Sr4Al2 octahedra, and faces with two equivalent O(23)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Sr(3), one Sr(6), one Nd(1), one Nd(2), one Ta(2), and one Al(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Sr(4), one Nd(1), one Nd(2), one Ta(1), and one Ta(2) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(5), one Sr(6), one Nd(1), one Al(1), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(22)Sr3NdAl2 octahedra,  an edgeedge with one O(23)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(2)Sr3NdAl2 octahedra,  a faceface with one O(3)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(14)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-62°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Nd(2), one Al(2), and one Al(4) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Al(3), and one Al(5) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Sr(2), two equivalent Sr(4), one Nd(1), one Ta(1), and one Al(4) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(3), two equivalent Sr(5), one Al(1), and one Al(5) atom to form distorted OSr4Al2 octahedra that share  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra, corners with two equivalent O(10)Sr4Al2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(2)Sr3NdAl2 octahedra,  a faceface with one O(22)Sr3NdAl2 octahedra, and  a faceface with one O(6)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 1-61°. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), two equivalent Nd(2), one Ta(2), and one Al(2) atom. In the twelfth O site, O(12) is bonded to one Sr(2), two equivalent Sr(6), one Nd(1), one Al(3), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra, corners with two equivalent O(12)Sr3NdAl2 octahedra, edges with two equivalent O(19)Sr4Al2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(23)Sr3NdAl2 octahedra,  a faceface with one O(3)Sr3NdAl2 octahedra, and  a faceface with one O(6)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 11-62°. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(4), one Nd(1), one Ta(1), and one Ta(2) atom. In the fourteenth O site, O(14) is bonded to one Sr(1), one Sr(5), one Sr(6), one Nd(1), one Al(1), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(2)Sr3NdAl2 octahedra,  an edgeedge with one O(3)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(22)Sr3NdAl2 octahedra,  a faceface with one O(23)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(6)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-62°. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Nd(2), one Al(2), and one Al(4) atom. In the sixteenth O site, O(16) is bonded in a distorted linear geometry to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Al(3), and one Al(5) atom. In the seventeenth O site, O(17) is bonded in a 2-coordinate geometry to one Sr(5), two equivalent Sr(1), one Nd(2), one Ta(1), and one Al(6) atom. In the eighteenth O site, O(18) is bonded in a 2-coordinate geometry to one Sr(4), one Sr(6), two equivalent Nd(1), one Ta(2), and one Al(1) atom. In the nineteenth O site, O(19) is bonded to one Sr(4), one Sr(6), two equivalent Sr(2), one Al(2), and one Al(5) atom to form distorted OSr4Al2 octahedra that share  a cornercorner with one O(14)Sr3NdAl2 octahedra,  a cornercorner with one O(2)Sr3NdAl2 octahedra,  a cornercorner with one O(22)Sr3NdAl2 octahedra,  a cornercorner with one O(23)Sr3NdAl2 octahedra,  a cornercorner with one O(3)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra, corners with two equivalent O(19)Sr4Al2 octahedra, edges with two equivalent O(12)Sr3NdAl2 octahedra,  a faceface with one O(23)Sr3NdAl2 octahedra, and  a faceface with one O(3)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 3-58°. In the twentieth O site, O(20) is bonded in a distorted linear geometry to one Sr(5), two equivalent Sr(3), one Nd(2), one Al(3), and one Al(4) atom. In the twenty-first O site, O(21) is bonded in a distorted linear geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(5), one Ta(1), and one Al(5) atom. In the twenty-second O site, O(22) is bonded to one Sr(3), one Sr(4), one Sr(5), one Nd(1), one Al(1), and one Al(4) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(10)Sr4Al2 octahedra, and faces with two equivalent O(2)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 5-60°. In the twenty-third O site, O(23) is bonded to one Sr(1), one Sr(2), one Sr(6), one Nd(2), one Al(2), and one Al(6) atom to form distorted OSr3NdAl2 octahedra that share  a cornercorner with one O(12)Sr3NdAl2 octahedra,  a cornercorner with one O(6)Sr3NdAl2 octahedra,  a cornercorner with one O(10)Sr4Al2 octahedra,  a cornercorner with one O(19)Sr4Al2 octahedra,  an edgeedge with one O(6)Sr3NdAl2 octahedra,  a faceface with one O(12)Sr3NdAl2 octahedra,  a faceface with one O(14)Sr3NdAl2 octahedra,  a faceface with one O(19)Sr4Al2 octahedra, and faces with two equivalent O(3)Sr3NdAl2 octahedra. The corner-sharing octahedral tilt angles range from 2-57°. In the twenty-fourth O site, O(24) is bonded in a 2-coordinate geometry to one Sr(3), one Sr(6), one Nd(1), one Nd(2), one Ta(2), and one Al(3) atom.