La12Ni6O25 crystallizes in the triclinic P1 space group. There are twelve inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(1), one O(17), one O(18), one O(24), one O(25), two equivalent O(2), and two equivalent O(7) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(20), one O(21), one O(5), one O(8), one O(9), two equivalent O(14), and two equivalent O(19) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(19), one O(3), one O(4), two equivalent O(15), and two equivalent O(5) atoms. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(3), one O(4), one O(7), two equivalent O(1), and two equivalent O(6) atoms. In the sixth La site, La(6) is bonded in a 8-coordinate geometry to one O(17), one O(18), one O(24), one O(25), one O(6), two equivalent O(2), and two equivalent O(7) atoms. In the seventh La site, La(7) is bonded in a 10-coordinate geometry to one O(13), one O(16), one O(17), one O(18), one O(24), one O(25), two equivalent O(10), and two equivalent O(22) atoms. In the eighth La site, La(8) is bonded in a 10-coordinate geometry to one O(10), one O(16), one O(20), one O(21), one O(8), one O(9), two equivalent O(13), and two equivalent O(23) atoms. In the ninth La site, La(9) is bonded in a 9-coordinate geometry to one O(15), one O(20), one O(21), one O(8), one O(9), two equivalent O(14), and two equivalent O(19) atoms. In the tenth La site, La(10) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(14), one O(3), one O(4), two equivalent O(15), and two equivalent O(5) atoms. In the eleventh La site, La(11) is bonded in a 10-coordinate geometry to one O(16), one O(17), one O(18), one O(23), one O(24), one O(25), two equivalent O(10), and two equivalent O(22) atoms. In the twelfth La site, La(12) is bonded in a 10-coordinate geometry to one O(16), one O(20), one O(21), one O(22), one O(8), one O(9), two equivalent O(13), and two equivalent O(23) atoms. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(11), one O(12), one O(3), one O(4), one O(5), and one O(6) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 4-16°. In the second Ni site, Ni(2) is bonded to one O(10), one O(17), one O(18), one O(24), one O(25), and one O(7) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 1-25°. In the third Ni site, Ni(3) is bonded to one O(13), one O(14), one O(20), one O(21), one O(8), and one O(9) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-28°. In the fourth Ni site, Ni(4) is bonded to one O(1), one O(11), one O(12), one O(15), one O(3), and one O(4) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 4-16°. In the fifth Ni site, Ni(5) is bonded to one O(17), one O(18), one O(2), one O(22), one O(24), and one O(25) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 1-25°. In the sixth Ni site, Ni(6) is bonded to one O(19), one O(20), one O(21), one O(23), one O(8), and one O(9) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-28°. There are twenty-five inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one La(2), two equivalent La(1), two equivalent La(5), and one Ni(4) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one La(1), two equivalent La(2), two equivalent La(6), and one Ni(5) atom. In the third O site, O(3) is bonded to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom to form a mixture of distorted corner, face, and edge-sharing OLa4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom to form distorted face-sharing OLa4Ni2 octahedra. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(10), two equivalent La(4), and one Ni(1) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one La(6), two equivalent La(1), two equivalent La(5), and one Ni(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one La(5), two equivalent La(2), two equivalent La(6), and one Ni(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom. In the ninth O site, O(9) is bonded to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(20)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(20)La4Ni2 octahedra, and faces with two equivalent O(21)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 6°. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(8), two equivalent La(11), two equivalent La(7), and one Ni(2) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom. In the twelfth O site, O(12) is bonded to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom to form a mixture of distorted corner, face, and edge-sharing OLa4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(7), two equivalent La(12), two equivalent La(8), and one Ni(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(10), two equivalent La(3), two equivalent La(9), and one Ni(3) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one La(9), two equivalent La(10), two equivalent La(4), and one Ni(4) atom. In the sixteenth O site, O(16) is bonded to one La(11), one La(12), one La(7), and one La(8) atom to form a mixture of corner and edge-sharing OLa4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-70°. In the seventeenth O site, O(17) is bonded to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(25)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(25)La4Ni2 octahedra, and faces with two equivalent O(18)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 5°. In the eighteenth O site, O(18) is bonded to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom to form OLa4Ni2 octahedra that share  an edgeedge with one O(16)La4 tetrahedra, faces with two equivalent O(17)La4Ni2 octahedra, and faces with two equivalent O(25)La4Ni2 octahedra. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one La(4), two equivalent La(3), two equivalent La(9), and one Ni(6) atom. In the twentieth O site, O(20) is bonded to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(9)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(9)La4Ni2 octahedra, and faces with two equivalent O(21)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 6°. In the twenty-first O site, O(21) is bonded to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom to form distorted OLa4Ni2 octahedra that share  an edgeedge with one O(16)La4 tetrahedra, faces with two equivalent O(20)La4Ni2 octahedra, and faces with two equivalent O(9)La4Ni2 octahedra. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one La(12), two equivalent La(11), two equivalent La(7), and one Ni(5) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one La(11), two equivalent La(12), two equivalent La(8), and one Ni(6) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom. In the twenty-fifth O site, O(25) is bonded to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(17)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(17)La4Ni2 octahedra, and faces with two equivalent O(18)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 5°.
La12Ni6O25 crystallizes in the triclinic P1 space group. There are twelve inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(2), one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms. The La(1)-O(11) bond length is 2.53 Å. The La(1)-O(12) bond length is 2.60 Å. The La(1)-O(2) bond length is 2.30 Å. The La(1)-O(3) bond length is 2.67 Å. The La(1)-O(4) bond length is 2.74 Å. There is one shorter (2.60 Å) and one longer (2.99 Å) La(1)-O(1) bond length. There is one shorter (2.48 Å) and one longer (3.20 Å) La(1)-O(6) bond length. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(1), one O(17), one O(18), one O(24), one O(25), two equivalent O(2), and two equivalent O(7) atoms. The La(2)-O(1) bond length is 2.40 Å. The La(2)-O(17) bond length is 2.64 Å. The La(2)-O(18) bond length is 2.61 Å. The La(2)-O(24) bond length is 2.43 Å. The La(2)-O(25) bond length is 2.55 Å. There is one shorter (2.77 Å) and one longer (2.85 Å) La(2)-O(2) bond length. There is one shorter (2.47 Å) and one longer (3.23 Å) La(2)-O(7) bond length. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(20), one O(21), one O(5), one O(8), one O(9), two equivalent O(14), and two equivalent O(19) atoms. The La(3)-O(20) bond length is 2.59 Å. The La(3)-O(21) bond length is 2.65 Å. The La(3)-O(5) bond length is 2.41 Å. The La(3)-O(8) bond length is 2.44 Å. The La(3)-O(9) bond length is 2.55 Å. There is one shorter (2.50 Å) and one longer (3.21 Å) La(3)-O(14) bond length. There is one shorter (2.58 Å) and one longer (3.04 Å) La(3)-O(19) bond length. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(19), one O(3), one O(4), two equivalent O(15), and two equivalent O(5) atoms. The La(4)-O(11) bond length is 2.76 Å. The La(4)-O(12) bond length is 2.66 Å. The La(4)-O(19) bond length is 2.30 Å. The La(4)-O(3) bond length is 2.59 Å. The La(4)-O(4) bond length is 2.53 Å. There is one shorter (2.49 Å) and one longer (3.19 Å) La(4)-O(15) bond length. There is one shorter (2.56 Å) and one longer (3.02 Å) La(4)-O(5) bond length. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(3), one O(4), one O(7), two equivalent O(1), and two equivalent O(6) atoms. The La(5)-O(11) bond length is 2.53 Å. The La(5)-O(12) bond length is 2.60 Å. The La(5)-O(3) bond length is 2.66 Å. The La(5)-O(4) bond length is 2.76 Å. The La(5)-O(7) bond length is 2.30 Å. There is one shorter (2.48 Å) and one longer (3.19 Å) La(5)-O(1) bond length. There is one shorter (2.59 Å) and one longer (2.99 Å) La(5)-O(6) bond length. In the sixth La site, La(6) is bonded in a 8-coordinate geometry to one O(17), one O(18), one O(24), one O(25), one O(6), two equivalent O(2), and two equivalent O(7) atoms. The La(6)-O(17) bond length is 2.63 Å. The La(6)-O(18) bond length is 2.60 Å. The La(6)-O(24) bond length is 2.43 Å. The La(6)-O(25) bond length is 2.56 Å. The La(6)-O(6) bond length is 2.40 Å. There is one shorter (2.47 Å) and one longer (3.24 Å) La(6)-O(2) bond length. There is one shorter (2.81 Å) and one longer (2.82 Å) La(6)-O(7) bond length. In the seventh La site, La(7) is bonded in a 10-coordinate geometry to one O(13), one O(16), one O(17), one O(18), one O(24), one O(25), two equivalent O(10), and two equivalent O(22) atoms. The La(7)-O(13) bond length is 2.47 Å. The La(7)-O(16) bond length is 2.36 Å. The La(7)-O(17) bond length is 2.67 Å. The La(7)-O(18) bond length is 2.69 Å. The La(7)-O(24) bond length is 2.98 Å. The La(7)-O(25) bond length is 2.81 Å. There is one shorter (2.51 Å) and one longer (3.05 Å) La(7)-O(10) bond length. There is one shorter (2.42 Å) and one longer (3.22 Å) La(7)-O(22) bond length. In the eighth La site, La(8) is bonded in a 10-coordinate geometry to one O(10), one O(16), one O(20), one O(21), one O(8), one O(9), two equivalent O(13), and two equivalent O(23) atoms. The La(8)-O(10) bond length is 2.47 Å. The La(8)-O(16) bond length is 2.37 Å. The La(8)-O(20) bond length is 2.74 Å. The La(8)-O(21) bond length is 2.64 Å. The La(8)-O(8) bond length is 3.00 Å. The La(8)-O(9) bond length is 2.79 Å. There is one shorter (2.48 Å) and one longer (3.07 Å) La(8)-O(13) bond length. There is one shorter (2.43 Å) and one longer (3.21 Å) La(8)-O(23) bond length. In the ninth La site, La(9) is bonded in a 9-coordinate geometry to one O(15), one O(20), one O(21), one O(8), one O(9), two equivalent O(14), and two equivalent O(19) atoms. The La(9)-O(15) bond length is 2.40 Å. The La(9)-O(20) bond length is 2.62 Å. The La(9)-O(21) bond length is 2.61 Å. The La(9)-O(8) bond length is 2.43 Å. The La(9)-O(9) bond length is 2.58 Å. There is one shorter (2.57 Å) and one longer (3.05 Å) La(9)-O(14) bond length. There is one shorter (2.50 Å) and one longer (3.21 Å) La(9)-O(19) bond length. In the tenth La site, La(10) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(14), one O(3), one O(4), two equivalent O(15), and two equivalent O(5) atoms. The La(10)-O(11) bond length is 2.74 Å. The La(10)-O(12) bond length is 2.66 Å. The La(10)-O(14) bond length is 2.30 Å. The La(10)-O(3) bond length is 2.60 Å. The La(10)-O(4) bond length is 2.53 Å. There is one shorter (2.56 Å) and one longer (3.02 Å) La(10)-O(15) bond length. There is one shorter (2.49 Å) and one longer (3.19 Å) La(10)-O(5) bond length. In the eleventh La site, La(11) is bonded in a 10-coordinate geometry to one O(16), one O(17), one O(18), one O(23), one O(24), one O(25), two equivalent O(10), and two equivalent O(22) atoms. The La(11)-O(16) bond length is 2.37 Å. The La(11)-O(17) bond length is 2.66 Å. The La(11)-O(18) bond length is 2.68 Å. The La(11)-O(23) bond length is 2.46 Å. The La(11)-O(24) bond length is 3.00 Å. The La(11)-O(25) bond length is 2.82 Å. There is one shorter (2.42 Å) and one longer (3.22 Å) La(11)-O(10) bond length. There is one shorter (2.53 Å) and one longer (3.03 Å) La(11)-O(22) bond length. In the twelfth La site, La(12) is bonded in a 10-coordinate geometry to one O(16), one O(20), one O(21), one O(22), one O(8), one O(9), two equivalent O(13), and two equivalent O(23) atoms. The La(12)-O(16) bond length is 2.37 Å. The La(12)-O(20) bond length is 2.72 Å. The La(12)-O(21) bond length is 2.62 Å. The La(12)-O(22) bond length is 2.46 Å. The La(12)-O(8) bond length is 3.07 Å. The La(12)-O(9) bond length is 2.76 Å. There is one shorter (2.46 Å) and one longer (3.19 Å) La(12)-O(13) bond length. There is one shorter (2.52 Å) and one longer (3.03 Å) La(12)-O(23) bond length. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(11), one O(12), one O(3), one O(4), one O(5), and one O(6) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 4-16°. The Ni(1)-O(11) bond length is 1.98 Å. The Ni(1)-O(12) bond length is 1.96 Å. The Ni(1)-O(3) bond length is 1.96 Å. The Ni(1)-O(4) bond length is 1.98 Å. The Ni(1)-O(5) bond length is 2.24 Å. The Ni(1)-O(6) bond length is 2.24 Å. In the second Ni site, Ni(2) is bonded to one O(10), one O(17), one O(18), one O(24), one O(25), and one O(7) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 1-25°. The Ni(2)-O(10) bond length is 2.10 Å. The Ni(2)-O(17) bond length is 1.96 Å. The Ni(2)-O(18) bond length is 2.00 Å. The Ni(2)-O(24) bond length is 1.97 Å. The Ni(2)-O(25) bond length is 1.97 Å. The Ni(2)-O(7) bond length is 2.37 Å. In the third Ni site, Ni(3) is bonded to one O(13), one O(14), one O(20), one O(21), one O(8), and one O(9) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-28°. The Ni(3)-O(13) bond length is 2.10 Å. The Ni(3)-O(14) bond length is 2.37 Å. The Ni(3)-O(20) bond length is 1.96 Å. The Ni(3)-O(21) bond length is 2.00 Å. The Ni(3)-O(8) bond length is 1.98 Å. The Ni(3)-O(9) bond length is 1.96 Å. In the fourth Ni site, Ni(4) is bonded to one O(1), one O(11), one O(12), one O(15), one O(3), and one O(4) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 4-16°. The Ni(4)-O(1) bond length is 2.24 Å. The Ni(4)-O(11) bond length is 1.98 Å. The Ni(4)-O(12) bond length is 1.96 Å. The Ni(4)-O(15) bond length is 2.24 Å. The Ni(4)-O(3) bond length is 1.96 Å. The Ni(4)-O(4) bond length is 1.98 Å. In the fifth Ni site, Ni(5) is bonded to one O(17), one O(18), one O(2), one O(22), one O(24), and one O(25) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 1-25°. The Ni(5)-O(17) bond length is 1.96 Å. The Ni(5)-O(18) bond length is 2.00 Å. The Ni(5)-O(2) bond length is 2.37 Å. The Ni(5)-O(22) bond length is 2.10 Å. The Ni(5)-O(24) bond length is 1.97 Å. The Ni(5)-O(25) bond length is 1.97 Å. In the sixth Ni site, Ni(6) is bonded to one O(19), one O(20), one O(21), one O(23), one O(8), and one O(9) atom to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 2-28°. The Ni(6)-O(19) bond length is 2.37 Å. The Ni(6)-O(20) bond length is 1.96 Å. The Ni(6)-O(21) bond length is 2.00 Å. The Ni(6)-O(23) bond length is 2.10 Å. The Ni(6)-O(8) bond length is 1.98 Å. The Ni(6)-O(9) bond length is 1.96 Å. There are twenty-five inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one La(2), two equivalent La(1), two equivalent La(5), and one Ni(4) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one La(1), two equivalent La(2), two equivalent La(6), and one Ni(5) atom. In the third O site, O(3) is bonded to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom to form a mixture of distorted corner, face, and edge-sharing OLa4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom to form distorted face-sharing OLa4Ni2 octahedra. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(10), two equivalent La(4), and one Ni(1) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one La(6), two equivalent La(1), two equivalent La(5), and one Ni(1) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one La(5), two equivalent La(2), two equivalent La(6), and one Ni(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom. In the ninth O site, O(9) is bonded to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(20)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(20)La4Ni2 octahedra, and faces with two equivalent O(21)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 6°. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(8), two equivalent La(11), two equivalent La(7), and one Ni(2) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom. In the twelfth O site, O(12) is bonded to one La(1), one La(10), one La(4), one La(5), one Ni(1), and one Ni(4) atom to form a mixture of distorted corner, face, and edge-sharing OLa4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(7), two equivalent La(12), two equivalent La(8), and one Ni(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(10), two equivalent La(3), two equivalent La(9), and one Ni(3) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one La(9), two equivalent La(10), two equivalent La(4), and one Ni(4) atom. In the sixteenth O site, O(16) is bonded to one La(11), one La(12), one La(7), and one La(8) atom to form a mixture of corner and edge-sharing OLa4 tetrahedra. The corner-sharing octahedral tilt angles range from 65-70°. In the seventeenth O site, O(17) is bonded to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(25)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(25)La4Ni2 octahedra, and faces with two equivalent O(18)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 5°. In the eighteenth O site, O(18) is bonded to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom to form OLa4Ni2 octahedra that share  an edgeedge with one O(16)La4 tetrahedra, faces with two equivalent O(17)La4Ni2 octahedra, and faces with two equivalent O(25)La4Ni2 octahedra. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one La(4), two equivalent La(3), two equivalent La(9), and one Ni(6) atom. In the twentieth O site, O(20) is bonded to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(9)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(9)La4Ni2 octahedra, and faces with two equivalent O(21)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 6°. In the twenty-first O site, O(21) is bonded to one La(12), one La(3), one La(8), one La(9), one Ni(3), and one Ni(6) atom to form distorted OLa4Ni2 octahedra that share  an edgeedge with one O(16)La4 tetrahedra, faces with two equivalent O(20)La4Ni2 octahedra, and faces with two equivalent O(9)La4Ni2 octahedra. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one La(12), two equivalent La(11), two equivalent La(7), and one Ni(5) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one La(11), two equivalent La(12), two equivalent La(8), and one Ni(6) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom. In the twenty-fifth O site, O(25) is bonded to one La(11), one La(2), one La(6), one La(7), one Ni(2), and one Ni(5) atom to form distorted OLa4Ni2 octahedra that share corners with two equivalent O(17)La4Ni2 octahedra, corners with two equivalent O(16)La4 tetrahedra, edges with two equivalent O(17)La4Ni2 octahedra, and faces with two equivalent O(18)La4Ni2 octahedra. The corner-sharing octahedral tilt angles are 5°.