NaSr12Ni7O23 crystallizes in the triclinic P1 space group. Na(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. There are twelve inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(14), one O(17), one O(19), one O(2), one O(3), one O(8), 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(15), one O(18), one O(20), one O(3), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(16), one O(2), one O(21), one O(7), and one O(8) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(16), one O(21), one O(23), one O(5), and one O(6) atom. In the fifth Sr site, Sr(5) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(14), one O(17), one O(19), one O(22), one O(4), and one O(6) atom. In the sixth Sr site, Sr(6) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(15), one O(18), one O(20), one O(4), and one O(5) atom. In the seventh Sr site, Sr(7) is bonded in a 7-coordinate geometry to one O(10), one O(14), one O(15), one O(2), one O(22), one O(5), and one O(9) atom. In the eighth Sr site, Sr(8) is bonded in a 7-coordinate geometry to one O(11), one O(13), one O(15), one O(22), one O(3), one O(6), and one O(7) atom. In the ninth Sr site, Sr(9) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(23), one O(4), and one O(8) atom. In the tenth Sr site, Sr(10) is bonded in a 8-coordinate geometry to one O(10), one O(16), one O(18), one O(19), one O(2), one O(21), one O(5), and one O(9) atom. In the eleventh Sr site, Sr(11) is bonded in a 8-coordinate geometry to one O(11), one O(16), one O(17), one O(19), one O(20), one O(3), one O(6), and one O(7) atom. In the twelfth Sr site, Sr(12) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(17), one O(18), one O(20), one O(21), one O(4), and one O(8) atom. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(13), one O(14), one O(15), one O(7), one O(8), and one O(9) atom to form face-sharing NiO6 octahedra. In the second Ni site, Ni(2) is bonded to one O(10), one O(11), one O(12), one O(13), one O(14), and one O(15) atom to form face-sharing NiO6 octahedra. In the third Ni site, Ni(3) is bonded to one O(1), one O(2), one O(22), one O(23), and one O(3) atom to form NiO5 trigonal bipyramids that share  an edgeedge with one Ni(7)O5 trigonal bipyramid and  a faceface with one Ni(5)O6 octahedra. In the fourth Ni site, Ni(4) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. In the fifth Ni site, Ni(5) is bonded to one O(1), one O(19), one O(2), one O(20), one O(21), and one O(3) atom to form face-sharing NiO6 octahedra. In the sixth Ni site, Ni(6) is bonded in a trigonal non-coplanar geometry to one O(16), one O(17), one O(18), and one O(6) atom. In the seventh Ni site, Ni(7) is bonded to one O(19), one O(20), one O(21), one O(22), and one O(23) atom to form distorted NiO5 trigonal bipyramids that share  an edgeedge with one Ni(3)O5 trigonal bipyramid and  a faceface with one Ni(5)O6 octahedra. There are twenty-three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(12), one Sr(2), one Sr(3), one Sr(9), one Ni(3), and one Ni(5) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(10), one Sr(3), one Sr(7), one Ni(3), and one Ni(5) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(11), one Sr(2), one Sr(8), one Ni(3), and one Ni(5) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(13)Sr4Ni2 octahedra,  a cornercorner with one O(14)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(11)NaSr4Ni octahedra, corners with two equivalent O(9)NaSr4Ni octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(15)Sr4Ni2 octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(19)Sr4Ni2 octahedra, and  a faceface with one O(20)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 4-63°. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(5), one Sr(6), one Sr(9), and one Ni(4) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(4), one Sr(6), one Sr(7), and one Ni(4) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(11), one Sr(4), one Sr(5), one Sr(8), one Ni(4), and one Ni(6) atom. In the seventh O site, O(7) is bonded to one Na(1), one Sr(11), one Sr(2), one Sr(3), one Sr(8), and one Ni(1) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(14)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra,  a cornercorner with one O(17)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(11)NaSr4Ni octahedra,  an edgeedge with one O(20)Sr4Ni2 octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra,  a faceface with one O(15)Sr4Ni2 octahedra, and  a faceface with one O(3)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-63°. In the eighth O site, O(8) is bonded to one Na(1), one Sr(1), one Sr(12), one Sr(3), one Sr(9), and one Ni(1) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(15)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(12)NaSr4Ni octahedra,  an edgeedge with one O(21)Sr4Ni2 octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(14)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-62°. In the ninth O site, O(9) is bonded to one Na(1), one Sr(1), one Sr(10), one Sr(2), one Sr(7), and one Ni(1) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(13)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(3)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(17)Sr4Ni square pyramid,  an edgeedge with one O(10)NaSr4Ni octahedra,  an edgeedge with one O(19)Sr4Ni2 octahedra,  an edgeedge with one O(18)Sr4Ni square pyramid,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(14)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-64°. In the tenth O site, O(10) is bonded to one Na(1), one Sr(10), one Sr(5), one Sr(6), one Sr(7), and one Ni(2) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(13)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(17)Sr4Ni square pyramid,  an edgeedge with one O(9)NaSr4Ni octahedra,  an edgeedge with one O(19)Sr4Ni2 octahedra,  an edgeedge with one O(18)Sr4Ni square pyramid,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(14)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-64°. In the eleventh O site, O(11) is bonded to one Na(1), one Sr(11), one Sr(4), one Sr(6), one Sr(8), and one Ni(2) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(14)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(3)Sr4Ni2 octahedra,  a cornercorner with one O(17)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(7)NaSr4Ni octahedra,  an edgeedge with one O(20)Sr4Ni2 octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-63°. In the twelfth O site, O(12) is bonded to one Na(1), one Sr(12), one Sr(4), one Sr(5), one Sr(9), and one Ni(2) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(15)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(8)NaSr4Ni octahedra,  an edgeedge with one O(21)Sr4Ni2 octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(14)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-62°. In the thirteenth O site, O(13) is bonded to one Sr(3), one Sr(4), one Sr(8), one Sr(9), one Ni(1), and one Ni(2) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(21)Sr4Ni2 octahedra, corners with two equivalent O(16)Sr4Ni square pyramids,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(14)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-51°. In the fourteenth O site, O(14) is bonded to one Sr(1), one Sr(5), one Sr(7), one Sr(9), one Ni(1), and one Ni(2) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(19)Sr4Ni2 octahedra, corners with two equivalent O(17)Sr4Ni square pyramids,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-63°. In the fifteenth O site, O(15) is bonded to one Sr(2), one Sr(6), one Sr(7), one Sr(8), one Ni(1), and one Ni(2) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra, corners with two equivalent O(20)Sr4Ni2 octahedra, corners with two equivalent O(18)Sr4Ni square pyramids,  an edgeedge with one O(3)Sr4Ni2 octahedra,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(14)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-54°. In the sixteenth O site, O(16) is bonded to one Sr(10), one Sr(11), one Sr(3), one Sr(4), and one Ni(6) atom to form distorted OSr4Ni square pyramids that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(13)Sr4Ni2 octahedra, corners with two equivalent O(19)Sr4Ni2 octahedra,  an edgeedge with one O(11)NaSr4Ni octahedra,  an edgeedge with one O(7)NaSr4Ni octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  an edgeedge with one O(18)Sr4Ni square pyramid, and  a faceface with one O(21)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 14-67°. In the seventeenth O site, O(17) is bonded to one Sr(1), one Sr(11), one Sr(12), one Sr(5), and one Ni(6) atom to form distorted OSr4Ni square pyramids that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(14)Sr4Ni2 octahedra, corners with two equivalent O(20)Sr4Ni2 octahedra,  an edgeedge with one O(12)NaSr4Ni octahedra,  an edgeedge with one O(8)NaSr4Ni octahedra,  an edgeedge with one O(3)Sr4Ni2 octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  an edgeedge with one O(18)Sr4Ni square pyramid, and  a faceface with one O(19)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 16-66°. In the eighteenth O site, O(18) is bonded to one Sr(10), one Sr(12), one Sr(2), one Sr(6), and one Ni(6) atom to form distorted OSr4Ni square pyramids that share  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(15)Sr4Ni2 octahedra, corners with two equivalent O(21)Sr4Ni2 octahedra,  an edgeedge with one O(10)NaSr4Ni octahedra,  an edgeedge with one O(9)NaSr4Ni octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  an edgeedge with one O(17)Sr4Ni square pyramid, and  a faceface with one O(20)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 15-63°. In the nineteenth O site, O(19) is bonded to one Sr(1), one Sr(10), one Sr(11), one Sr(5), one Ni(5), and one Ni(7) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra, corners with two equivalent O(14)Sr4Ni2 octahedra,  a cornercorner with one O(18)Sr4Ni square pyramid, corners with two equivalent O(16)Sr4Ni square pyramids,  an edgeedge with one O(10)NaSr4Ni octahedra,  an edgeedge with one O(9)NaSr4Ni octahedra,  a faceface with one O(20)Sr4Ni2 octahedra,  a faceface with one O(21)Sr4Ni2 octahedra,  a faceface with one O(3)Sr4Ni2 octahedra, and  a faceface with one O(17)Sr4Ni square pyramid. The corner-sharing octahedral tilt angles range from 27-61°. In the twentieth O site, O(20) is bonded to one Sr(11), one Sr(12), one Sr(2), one Sr(6), one Ni(5), and one Ni(7) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra, corners with two equivalent O(15)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid, corners with two equivalent O(17)Sr4Ni square pyramids,  an edgeedge with one O(11)NaSr4Ni octahedra,  an edgeedge with one O(7)NaSr4Ni octahedra,  a faceface with one O(19)Sr4Ni2 octahedra,  a faceface with one O(21)Sr4Ni2 octahedra,  a faceface with one O(3)Sr4Ni2 octahedra, and  a faceface with one O(18)Sr4Ni square pyramid. The corner-sharing octahedral tilt angles range from 26-60°. In the twenty-first O site, O(21) is bonded to one Sr(10), one Sr(12), one Sr(3), one Sr(4), one Ni(5), and one Ni(7) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(13)Sr4Ni2 octahedra,  a cornercorner with one O(17)Sr4Ni square pyramid, corners with two equivalent O(18)Sr4Ni square pyramids,  an edgeedge with one O(12)NaSr4Ni octahedra,  an edgeedge with one O(8)NaSr4Ni octahedra,  a faceface with one O(19)Sr4Ni2 octahedra,  a faceface with one O(20)Sr4Ni2 octahedra, and  a faceface with one O(16)Sr4Ni square pyramid. The corner-sharing octahedral tilt angles range from 4-61°. In the twenty-second O site, O(22) is bonded in a 5-coordinate geometry to one Sr(5), one Sr(7), one Sr(8), one Ni(3), and one Ni(7) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(9), one Ni(3), and one Ni(7) atom.
NaSr12Ni7O23 crystallizes in the triclinic P1 space group. Na(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. The Na(1)-O(10) bond length is 2.36 Å. The Na(1)-O(11) bond length is 2.36 Å. The Na(1)-O(12) bond length is 2.31 Å. The Na(1)-O(7) bond length is 2.38 Å. The Na(1)-O(8) bond length is 2.35 Å. The Na(1)-O(9) bond length is 2.36 Å. There are twelve inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(14), one O(17), one O(19), one O(2), one O(3), one O(8), and one O(9) atom. The Sr(1)-O(14) bond length is 2.68 Å. The Sr(1)-O(17) bond length is 2.36 Å. The Sr(1)-O(19) bond length is 2.60 Å. The Sr(1)-O(2) bond length is 2.83 Å. The Sr(1)-O(3) bond length is 2.71 Å. The Sr(1)-O(8) bond length is 2.69 Å. The Sr(1)-O(9) bond length is 2.52 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(15), one O(18), one O(20), one O(3), one O(7), and one O(9) atom. The Sr(2)-O(1) bond length is 2.66 Å. The Sr(2)-O(15) bond length is 2.66 Å. The Sr(2)-O(18) bond length is 2.36 Å. The Sr(2)-O(20) bond length is 2.70 Å. The Sr(2)-O(3) bond length is 2.75 Å. The Sr(2)-O(7) bond length is 2.52 Å. The Sr(2)-O(9) bond length is 2.64 Å. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(16), one O(2), one O(21), one O(7), and one O(8) atom. The Sr(3)-O(1) bond length is 2.87 Å. The Sr(3)-O(13) bond length is 2.67 Å. The Sr(3)-O(16) bond length is 2.34 Å. The Sr(3)-O(2) bond length is 2.66 Å. The Sr(3)-O(21) bond length is 2.62 Å. The Sr(3)-O(7) bond length is 2.72 Å. The Sr(3)-O(8) bond length is 2.52 Å. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(16), one O(21), one O(23), one O(5), and one O(6) atom. The Sr(4)-O(11) bond length is 2.79 Å. The Sr(4)-O(12) bond length is 2.64 Å. The Sr(4)-O(13) bond length is 2.64 Å. The Sr(4)-O(16) bond length is 2.49 Å. The Sr(4)-O(21) bond length is 2.63 Å. The Sr(4)-O(23) bond length is 2.61 Å. The Sr(4)-O(5) bond length is 2.62 Å. The Sr(4)-O(6) bond length is 2.80 Å. In the fifth Sr site, Sr(5) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(14), one O(17), one O(19), one O(22), one O(4), and one O(6) atom. The Sr(5)-O(10) bond length is 2.67 Å. The Sr(5)-O(12) bond length is 2.67 Å. The Sr(5)-O(14) bond length is 2.65 Å. The Sr(5)-O(17) bond length is 2.48 Å. The Sr(5)-O(19) bond length is 2.63 Å. The Sr(5)-O(22) bond length is 2.59 Å. The Sr(5)-O(4) bond length is 3.03 Å. The Sr(5)-O(6) bond length is 2.64 Å. In the sixth Sr site, Sr(6) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(15), one O(18), one O(20), one O(4), and one O(5) atom. The Sr(6)-O(10) bond length is 2.62 Å. The Sr(6)-O(11) bond length is 2.64 Å. The Sr(6)-O(15) bond length is 2.62 Å. The Sr(6)-O(18) bond length is 2.45 Å. The Sr(6)-O(20) bond length is 2.60 Å. The Sr(6)-O(4) bond length is 2.57 Å. The Sr(6)-O(5) bond length is 2.80 Å. In the seventh Sr site, Sr(7) is bonded in a 7-coordinate geometry to one O(10), one O(14), one O(15), one O(2), one O(22), one O(5), and one O(9) atom. The Sr(7)-O(10) bond length is 2.63 Å. The Sr(7)-O(14) bond length is 2.52 Å. The Sr(7)-O(15) bond length is 2.69 Å. The Sr(7)-O(2) bond length is 2.57 Å. The Sr(7)-O(22) bond length is 2.82 Å. The Sr(7)-O(5) bond length is 2.36 Å. The Sr(7)-O(9) bond length is 2.75 Å. In the eighth Sr site, Sr(8) is bonded in a 7-coordinate geometry to one O(11), one O(13), one O(15), one O(22), one O(3), one O(6), and one O(7) atom. The Sr(8)-O(11) bond length is 2.64 Å. The Sr(8)-O(13) bond length is 2.55 Å. The Sr(8)-O(15) bond length is 2.59 Å. The Sr(8)-O(22) bond length is 2.67 Å. The Sr(8)-O(3) bond length is 2.63 Å. The Sr(8)-O(6) bond length is 2.37 Å. The Sr(8)-O(7) bond length is 2.72 Å. In the ninth Sr site, Sr(9) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(13), one O(14), one O(23), one O(4), and one O(8) atom. The Sr(9)-O(1) bond length is 2.61 Å. The Sr(9)-O(12) bond length is 2.62 Å. The Sr(9)-O(13) bond length is 2.56 Å. The Sr(9)-O(14) bond length is 2.58 Å. The Sr(9)-O(23) bond length is 2.48 Å. The Sr(9)-O(4) bond length is 2.38 Å. The Sr(9)-O(8) bond length is 2.66 Å. In the tenth Sr site, Sr(10) is bonded in a 8-coordinate geometry to one O(10), one O(16), one O(18), one O(19), one O(2), one O(21), one O(5), and one O(9) atom. The Sr(10)-O(10) bond length is 2.62 Å. The Sr(10)-O(16) bond length is 2.75 Å. The Sr(10)-O(18) bond length is 2.56 Å. The Sr(10)-O(19) bond length is 2.62 Å. The Sr(10)-O(2) bond length is 2.62 Å. The Sr(10)-O(21) bond length is 2.76 Å. The Sr(10)-O(5) bond length is 2.78 Å. The Sr(10)-O(9) bond length is 2.60 Å. In the eleventh Sr site, Sr(11) is bonded in a 8-coordinate geometry to one O(11), one O(16), one O(17), one O(19), one O(20), one O(3), one O(6), and one O(7) atom. The Sr(11)-O(11) bond length is 2.52 Å. The Sr(11)-O(16) bond length is 2.58 Å. The Sr(11)-O(17) bond length is 2.72 Å. The Sr(11)-O(19) bond length is 2.84 Å. The Sr(11)-O(20) bond length is 2.68 Å. The Sr(11)-O(3) bond length is 2.75 Å. The Sr(11)-O(6) bond length is 2.73 Å. The Sr(11)-O(7) bond length is 2.56 Å. In the twelfth Sr site, Sr(12) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(17), one O(18), one O(20), one O(21), one O(4), and one O(8) atom. The Sr(12)-O(1) bond length is 2.75 Å. The Sr(12)-O(12) bond length is 2.64 Å. The Sr(12)-O(17) bond length is 2.57 Å. The Sr(12)-O(18) bond length is 2.71 Å. The Sr(12)-O(20) bond length is 2.83 Å. The Sr(12)-O(21) bond length is 2.63 Å. The Sr(12)-O(4) bond length is 2.74 Å. The Sr(12)-O(8) bond length is 2.64 Å. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(13), one O(14), one O(15), one O(7), one O(8), and one O(9) atom to form face-sharing NiO6 octahedra. The Ni(1)-O(13) bond length is 1.95 Å. The Ni(1)-O(14) bond length is 1.95 Å. The Ni(1)-O(15) bond length is 1.98 Å. The Ni(1)-O(7) bond length is 1.89 Å. The Ni(1)-O(8) bond length is 1.90 Å. The Ni(1)-O(9) bond length is 1.90 Å. In the second Ni site, Ni(2) is bonded to one O(10), one O(11), one O(12), one O(13), one O(14), and one O(15) atom to form face-sharing NiO6 octahedra. The Ni(2)-O(10) bond length is 1.88 Å. The Ni(2)-O(11) bond length is 1.88 Å. The Ni(2)-O(12) bond length is 1.88 Å. The Ni(2)-O(13) bond length is 1.97 Å. The Ni(2)-O(14) bond length is 1.96 Å. The Ni(2)-O(15) bond length is 2.00 Å. In the third Ni site, Ni(3) is bonded to one O(1), one O(2), one O(22), one O(23), and one O(3) atom to form NiO5 trigonal bipyramids that share  an edgeedge with one Ni(7)O5 trigonal bipyramid and  a faceface with one Ni(5)O6 octahedra. The Ni(3)-O(1) bond length is 1.97 Å. The Ni(3)-O(2) bond length is 2.04 Å. The Ni(3)-O(22) bond length is 1.87 Å. The Ni(3)-O(23) bond length is 1.87 Å. The Ni(3)-O(3) bond length is 1.94 Å. In the fourth Ni site, Ni(4) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. The Ni(4)-O(4) bond length is 1.85 Å. The Ni(4)-O(5) bond length is 1.85 Å. The Ni(4)-O(6) bond length is 1.85 Å. In the fifth Ni site, Ni(5) is bonded to one O(1), one O(19), one O(2), one O(20), one O(21), and one O(3) atom to form face-sharing NiO6 octahedra. The Ni(5)-O(1) bond length is 1.97 Å. The Ni(5)-O(19) bond length is 1.89 Å. The Ni(5)-O(2) bond length is 1.94 Å. The Ni(5)-O(20) bond length is 1.92 Å. The Ni(5)-O(21) bond length is 1.89 Å. The Ni(5)-O(3) bond length is 1.94 Å. In the sixth Ni site, Ni(6) is bonded in a trigonal non-coplanar geometry to one O(16), one O(17), one O(18), and one O(6) atom. The Ni(6)-O(16) bond length is 1.91 Å. The Ni(6)-O(17) bond length is 1.93 Å. The Ni(6)-O(18) bond length is 1.94 Å. The Ni(6)-O(6) bond length is 2.61 Å. In the seventh Ni site, Ni(7) is bonded to one O(19), one O(20), one O(21), one O(22), and one O(23) atom to form distorted NiO5 trigonal bipyramids that share  an edgeedge with one Ni(3)O5 trigonal bipyramid and  a faceface with one Ni(5)O6 octahedra. The Ni(7)-O(19) bond length is 2.08 Å. The Ni(7)-O(20) bond length is 2.12 Å. The Ni(7)-O(21) bond length is 2.09 Å. The Ni(7)-O(22) bond length is 2.09 Å. The Ni(7)-O(23) bond length is 2.01 Å. There are twenty-three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(12), one Sr(2), one Sr(3), one Sr(9), one Ni(3), and one Ni(5) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(10), one Sr(3), one Sr(7), one Ni(3), and one Ni(5) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(11), one Sr(2), one Sr(8), one Ni(3), and one Ni(5) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(13)Sr4Ni2 octahedra,  a cornercorner with one O(14)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(11)NaSr4Ni octahedra, corners with two equivalent O(9)NaSr4Ni octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(15)Sr4Ni2 octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(19)Sr4Ni2 octahedra, and  a faceface with one O(20)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 4-63°. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(5), one Sr(6), one Sr(9), and one Ni(4) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(4), one Sr(6), one Sr(7), and one Ni(4) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(11), one Sr(4), one Sr(5), one Sr(8), one Ni(4), and one Ni(6) atom. In the seventh O site, O(7) is bonded to one Na(1), one Sr(11), one Sr(2), one Sr(3), one Sr(8), and one Ni(1) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(14)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra,  a cornercorner with one O(17)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(11)NaSr4Ni octahedra,  an edgeedge with one O(20)Sr4Ni2 octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra,  a faceface with one O(15)Sr4Ni2 octahedra, and  a faceface with one O(3)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-63°. In the eighth O site, O(8) is bonded to one Na(1), one Sr(1), one Sr(12), one Sr(3), one Sr(9), and one Ni(1) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(15)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(12)NaSr4Ni octahedra,  an edgeedge with one O(21)Sr4Ni2 octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(14)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-62°. In the ninth O site, O(9) is bonded to one Na(1), one Sr(1), one Sr(10), one Sr(2), one Sr(7), and one Ni(1) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(13)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(3)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(17)Sr4Ni square pyramid,  an edgeedge with one O(10)NaSr4Ni octahedra,  an edgeedge with one O(19)Sr4Ni2 octahedra,  an edgeedge with one O(18)Sr4Ni square pyramid,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(14)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-64°. In the tenth O site, O(10) is bonded to one Na(1), one Sr(10), one Sr(5), one Sr(6), one Sr(7), and one Ni(2) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(13)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(17)Sr4Ni square pyramid,  an edgeedge with one O(9)NaSr4Ni octahedra,  an edgeedge with one O(19)Sr4Ni2 octahedra,  an edgeedge with one O(18)Sr4Ni square pyramid,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(14)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-64°. In the eleventh O site, O(11) is bonded to one Na(1), one Sr(11), one Sr(4), one Sr(6), one Sr(8), and one Ni(2) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(14)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(3)Sr4Ni2 octahedra,  a cornercorner with one O(17)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(7)NaSr4Ni octahedra,  an edgeedge with one O(20)Sr4Ni2 octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-63°. In the twelfth O site, O(12) is bonded to one Na(1), one Sr(12), one Sr(4), one Sr(5), one Sr(9), and one Ni(2) atom to form distorted ONaSr4Ni octahedra that share  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(15)Sr4Ni2 octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid,  a cornercorner with one O(18)Sr4Ni square pyramid,  an edgeedge with one O(8)NaSr4Ni octahedra,  an edgeedge with one O(21)Sr4Ni2 octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(14)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-62°. In the thirteenth O site, O(13) is bonded to one Sr(3), one Sr(4), one Sr(8), one Sr(9), one Ni(1), and one Ni(2) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(21)Sr4Ni2 octahedra, corners with two equivalent O(16)Sr4Ni square pyramids,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(14)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-51°. In the fourteenth O site, O(14) is bonded to one Sr(1), one Sr(5), one Sr(7), one Sr(9), one Ni(1), and one Ni(2) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(19)Sr4Ni2 octahedra, corners with two equivalent O(17)Sr4Ni square pyramids,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(12)NaSr4Ni octahedra,  a faceface with one O(8)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(15)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-63°. In the fifteenth O site, O(15) is bonded to one Sr(2), one Sr(6), one Sr(7), one Sr(8), one Ni(1), and one Ni(2) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra, corners with two equivalent O(20)Sr4Ni2 octahedra, corners with two equivalent O(18)Sr4Ni square pyramids,  an edgeedge with one O(3)Sr4Ni2 octahedra,  a faceface with one O(10)NaSr4Ni octahedra,  a faceface with one O(11)NaSr4Ni octahedra,  a faceface with one O(7)NaSr4Ni octahedra,  a faceface with one O(9)NaSr4Ni octahedra,  a faceface with one O(13)Sr4Ni2 octahedra, and  a faceface with one O(14)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 8-54°. In the sixteenth O site, O(16) is bonded to one Sr(10), one Sr(11), one Sr(3), one Sr(4), and one Ni(6) atom to form distorted OSr4Ni square pyramids that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(20)Sr4Ni2 octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(13)Sr4Ni2 octahedra, corners with two equivalent O(19)Sr4Ni2 octahedra,  an edgeedge with one O(11)NaSr4Ni octahedra,  an edgeedge with one O(7)NaSr4Ni octahedra,  an edgeedge with one O(17)Sr4Ni square pyramid,  an edgeedge with one O(18)Sr4Ni square pyramid, and  a faceface with one O(21)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 14-67°. In the seventeenth O site, O(17) is bonded to one Sr(1), one Sr(11), one Sr(12), one Sr(5), and one Ni(6) atom to form distorted OSr4Ni square pyramids that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(21)Sr4Ni2 octahedra, corners with two equivalent O(14)Sr4Ni2 octahedra, corners with two equivalent O(20)Sr4Ni2 octahedra,  an edgeedge with one O(12)NaSr4Ni octahedra,  an edgeedge with one O(8)NaSr4Ni octahedra,  an edgeedge with one O(3)Sr4Ni2 octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  an edgeedge with one O(18)Sr4Ni square pyramid, and  a faceface with one O(19)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 16-66°. In the eighteenth O site, O(18) is bonded to one Sr(10), one Sr(12), one Sr(2), one Sr(6), and one Ni(6) atom to form distorted OSr4Ni square pyramids that share  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(19)Sr4Ni2 octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(15)Sr4Ni2 octahedra, corners with two equivalent O(21)Sr4Ni2 octahedra,  an edgeedge with one O(10)NaSr4Ni octahedra,  an edgeedge with one O(9)NaSr4Ni octahedra,  an edgeedge with one O(16)Sr4Ni square pyramid,  an edgeedge with one O(17)Sr4Ni square pyramid, and  a faceface with one O(20)Sr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 15-63°. In the nineteenth O site, O(19) is bonded to one Sr(1), one Sr(10), one Sr(11), one Sr(5), one Ni(5), and one Ni(7) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra, corners with two equivalent O(14)Sr4Ni2 octahedra,  a cornercorner with one O(18)Sr4Ni square pyramid, corners with two equivalent O(16)Sr4Ni square pyramids,  an edgeedge with one O(10)NaSr4Ni octahedra,  an edgeedge with one O(9)NaSr4Ni octahedra,  a faceface with one O(20)Sr4Ni2 octahedra,  a faceface with one O(21)Sr4Ni2 octahedra,  a faceface with one O(3)Sr4Ni2 octahedra, and  a faceface with one O(17)Sr4Ni square pyramid. The corner-sharing octahedral tilt angles range from 27-61°. In the twentieth O site, O(20) is bonded to one Sr(11), one Sr(12), one Sr(2), one Sr(6), one Ni(5), and one Ni(7) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(12)NaSr4Ni octahedra,  a cornercorner with one O(8)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra, corners with two equivalent O(15)Sr4Ni2 octahedra,  a cornercorner with one O(16)Sr4Ni square pyramid, corners with two equivalent O(17)Sr4Ni square pyramids,  an edgeedge with one O(11)NaSr4Ni octahedra,  an edgeedge with one O(7)NaSr4Ni octahedra,  a faceface with one O(19)Sr4Ni2 octahedra,  a faceface with one O(21)Sr4Ni2 octahedra,  a faceface with one O(3)Sr4Ni2 octahedra, and  a faceface with one O(18)Sr4Ni square pyramid. The corner-sharing octahedral tilt angles range from 26-60°. In the twenty-first O site, O(21) is bonded to one Sr(10), one Sr(12), one Sr(3), one Sr(4), one Ni(5), and one Ni(7) atom to form distorted OSr4Ni2 octahedra that share  a cornercorner with one O(10)NaSr4Ni octahedra,  a cornercorner with one O(11)NaSr4Ni octahedra,  a cornercorner with one O(7)NaSr4Ni octahedra,  a cornercorner with one O(9)NaSr4Ni octahedra,  a cornercorner with one O(3)Sr4Ni2 octahedra, corners with two equivalent O(13)Sr4Ni2 octahedra,  a cornercorner with one O(17)Sr4Ni square pyramid, corners with two equivalent O(18)Sr4Ni square pyramids,  an edgeedge with one O(12)NaSr4Ni octahedra,  an edgeedge with one O(8)NaSr4Ni octahedra,  a faceface with one O(19)Sr4Ni2 octahedra,  a faceface with one O(20)Sr4Ni2 octahedra, and  a faceface with one O(16)Sr4Ni square pyramid. The corner-sharing octahedral tilt angles range from 4-61°. In the twenty-second O site, O(22) is bonded in a 5-coordinate geometry to one Sr(5), one Sr(7), one Sr(8), one Ni(3), and one Ni(7) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(9), one Ni(3), and one Ni(7) atom.