Pr10Ni5O22 crystallizes in the triclinic P1 space group. There are ten inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to one O(7), one O(8), two equivalent O(14), two equivalent O(20), and two equivalent O(6) atoms. In the second Pr site, Pr(2) is bonded in a 5-coordinate geometry to one O(11), two equivalent O(1), two equivalent O(12), and two equivalent O(3) atoms. In the third Pr site, Pr(3) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms. In the fourth Pr site, Pr(4) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(15), two equivalent O(16), two equivalent O(2), and two equivalent O(9) atoms. In the fifth Pr site, Pr(5) is bonded in a 9-coordinate geometry to one O(12), two equivalent O(2), two equivalent O(9), and four equivalent O(11) atoms. In the sixth Pr site, Pr(6) is bonded in a 9-coordinate geometry to one O(18), two equivalent O(13), two equivalent O(4), and four equivalent O(19) atoms. In the seventh Pr site, Pr(7) is bonded in a 7-coordinate geometry to one O(15), one O(16), two equivalent O(13), two equivalent O(4), and two equivalent O(5) atoms. In the eighth Pr site, Pr(8) is bonded in a 7-coordinate geometry to one O(22), two equivalent O(10), two equivalent O(17), and two equivalent O(21) atoms. In the ninth Pr site, Pr(9) is bonded in a 9-coordinate geometry to one O(19), two equivalent O(10), two equivalent O(17), and four equivalent O(18) atoms. In the tenth Pr site, Pr(10) is bonded in a 7-coordinate geometry to one O(21), two equivalent O(14), two equivalent O(20), and two equivalent O(22) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(12), two equivalent O(1), and two equivalent O(3) atoms to form corner-sharing NiO5 trigonal bipyramids. In the second Ni site, Ni(2) is bonded to one O(11), one O(16), two equivalent O(2), and two equivalent O(9) atoms to form NiO6 octahedra that share corners with four equivalent Ni(2)O6 octahedra and  a cornercorner with one O(15)Pr3O tetrahedra. The corner-sharing octahedral tilt angles range from 10-15°. In the third Ni site, Ni(3) is bonded to one O(19), one O(5), two equivalent O(13), and two equivalent O(4) atoms to form distorted corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 4-8°. In the fourth Ni site, Ni(4) is bonded to one O(18), one O(21), two equivalent O(10), and two equivalent O(17) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 7°. In the fifth Ni site, Ni(5) is bonded in a 6-coordinate geometry to one O(22), one O(6), two equivalent O(14), and two equivalent O(20) atoms. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), and two equivalent Ni(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Pr(4), two equivalent Pr(5), and two equivalent Ni(2) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), and two equivalent Ni(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Pr(6), two equivalent Pr(7), and two equivalent Ni(3) atoms to form distorted OPr4Ni2 octahedra that share corners with two equivalent O(4)Pr4Ni2 octahedra, corners with two equivalent O(15)Pr3O tetrahedra, corners with three equivalent O(5)Pr3Ni tetrahedra, edges with two equivalent O(4)Pr4Ni2 octahedra, faces with four equivalent O(13)Pr4Ni2 octahedra, and  a faceface with one O(5)Pr3Ni tetrahedra. The corner-sharing octahedral tilt angles are 4°. In the fifth O site, O(5) is bonded to one Pr(4), two equivalent Pr(7), and one Ni(3) atom to form distorted OPr3Ni tetrahedra that share corners with two equivalent O(13)Pr4Ni2 octahedra, corners with three equivalent O(4)Pr4Ni2 octahedra, corners with two equivalent O(5)Pr3Ni tetrahedra, corners with four equivalent O(15)Pr3O tetrahedra, edges with two equivalent O(13)Pr4Ni2 octahedra, and  a faceface with one O(4)Pr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 32-81°. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Pr(3), two equivalent Pr(1), and one Ni(5) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(3), and one O(8) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(3), and one O(7) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to two equivalent Pr(4), two equivalent Pr(5), and two equivalent Ni(2) atoms. In the tenth O site, O(10) is bonded to two equivalent Pr(8), two equivalent Pr(9), and two equivalent Ni(4) atoms to form a mixture of face, corner, and edge-sharing OPr4Ni2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Pr(2), four equivalent Pr(5), and one Ni(2) atom. In the twelfth O site, O(12) is bonded in a distorted see-saw-like geometry to one Pr(5), two equivalent Pr(2), and one Ni(1) atom. In the thirteenth O site, O(13) is bonded to two equivalent Pr(6), two equivalent Pr(7), and two equivalent Ni(3) atoms to form distorted OPr4Ni2 octahedra that share corners with two equivalent O(13)Pr4Ni2 octahedra, corners with two equivalent O(5)Pr3Ni tetrahedra, corners with two equivalent O(15)Pr3O tetrahedra, edges with two equivalent O(13)Pr4Ni2 octahedra, edges with two equivalent O(5)Pr3Ni tetrahedra, and faces with four equivalent O(4)Pr4Ni2 octahedra. The corner-sharing octahedral tilt angles are 8°. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to two equivalent Pr(1), two equivalent Pr(10), and two equivalent Ni(5) atoms. In the fifteenth O site, O(15) is bonded to one Pr(7), two equivalent Pr(4), and one O(16) atom to form distorted OPr3O tetrahedra that share  a cornercorner with one Ni(2)O6 octahedra, corners with two equivalent O(13)Pr4Ni2 octahedra, corners with two equivalent O(4)Pr4Ni2 octahedra, corners with two equivalent O(15)Pr3O tetrahedra, and corners with four equivalent O(5)Pr3Ni tetrahedra. The corner-sharing octahedral tilt angles range from 21-80°. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Pr(7), two equivalent Pr(4), one Ni(2), and one O(15) atom. In the seventeenth O site, O(17) is bonded to two equivalent Pr(8), two equivalent Pr(9), and two equivalent Ni(4) atoms to form a mixture of distorted face, corner, and edge-sharing OPr4Ni2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the eighteenth O site, O(18) is bonded in a 6-coordinate geometry to one Pr(6), four equivalent Pr(9), and one Ni(4) atom. In the nineteenth O site, O(19) is bonded in a 6-coordinate geometry to one Pr(9), four equivalent Pr(6), and one Ni(3) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to two equivalent Pr(1), two equivalent Pr(10), and two equivalent Ni(5) atoms. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Pr(10), two equivalent Pr(8), and one Ni(4) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Pr(8), two equivalent Pr(10), and one Ni(5) atom.
Pr10Ni5O22 crystallizes in the triclinic P1 space group. There are ten inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 8-coordinate geometry to one O(7), one O(8), two equivalent O(14), two equivalent O(20), and two equivalent O(6) atoms. The Pr(1)-O(7) bond length is 2.62 Å. The Pr(1)-O(8) bond length is 2.54 Å. There is one shorter (2.69 Å) and one longer (2.88 Å) Pr(1)-O(14) bond length. There is one shorter (2.45 Å) and one longer (2.55 Å) Pr(1)-O(20) bond length. There is one shorter (2.44 Å) and one longer (2.48 Å) Pr(1)-O(6) bond length. In the second Pr site, Pr(2) is bonded in a 5-coordinate geometry to one O(11), two equivalent O(1), two equivalent O(12), and two equivalent O(3) atoms. The Pr(2)-O(11) bond length is 2.33 Å. There is one shorter (2.76 Å) and one longer (2.94 Å) Pr(2)-O(1) bond length. There is one shorter (2.47 Å) and one longer (2.48 Å) Pr(2)-O(12) bond length. There is one shorter (2.47 Å) and one longer (2.51 Å) Pr(2)-O(3) bond length. In the third Pr site, Pr(3) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(1), two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms. The Pr(3)-O(6) bond length is 2.71 Å. There is one shorter (2.46 Å) and one longer (2.49 Å) Pr(3)-O(1) bond length. There is one shorter (2.81 Å) and one longer (2.92 Å) Pr(3)-O(3) bond length. There is one shorter (2.35 Å) and one longer (2.37 Å) Pr(3)-O(7) bond length. There is one shorter (2.31 Å) and one longer (2.34 Å) Pr(3)-O(8) bond length. In the fourth Pr site, Pr(4) is bonded in a 9-coordinate geometry to one O(5), two equivalent O(15), two equivalent O(16), two equivalent O(2), and two equivalent O(9) atoms. The Pr(4)-O(5) bond length is 2.38 Å. There is one shorter (2.43 Å) and one longer (2.45 Å) Pr(4)-O(15) bond length. There is one shorter (2.48 Å) and one longer (2.52 Å) Pr(4)-O(16) bond length. There is one shorter (2.77 Å) and one longer (2.94 Å) Pr(4)-O(2) bond length. There is one shorter (2.50 Å) and one longer (2.69 Å) Pr(4)-O(9) bond length. In the fifth Pr site, Pr(5) is bonded in a 9-coordinate geometry to one O(12), two equivalent O(2), two equivalent O(9), and four equivalent O(11) atoms. The Pr(5)-O(12) bond length is 2.44 Å. There is one shorter (2.43 Å) and one longer (2.49 Å) Pr(5)-O(2) bond length. There is one shorter (2.60 Å) and one longer (2.86 Å) Pr(5)-O(9) bond length. There are a spread of Pr(5)-O(11) bond distances ranging from 2.52-3.32 Å. In the sixth Pr site, Pr(6) is bonded in a 9-coordinate geometry to one O(18), two equivalent O(13), two equivalent O(4), and four equivalent O(19) atoms. The Pr(6)-O(18) bond length is 2.25 Å. There is one shorter (2.60 Å) and one longer (2.66 Å) Pr(6)-O(13) bond length. There is one shorter (2.57 Å) and one longer (2.65 Å) Pr(6)-O(4) bond length. There are a spread of Pr(6)-O(19) bond distances ranging from 2.58-3.12 Å. In the seventh Pr site, Pr(7) is bonded in a 7-coordinate geometry to one O(15), one O(16), two equivalent O(13), two equivalent O(4), and two equivalent O(5) atoms. The Pr(7)-O(15) bond length is 2.43 Å. The Pr(7)-O(16) bond length is 2.71 Å. There is one shorter (2.49 Å) and one longer (2.68 Å) Pr(7)-O(13) bond length. There is one shorter (2.57 Å) and one longer (2.61 Å) Pr(7)-O(4) bond length. There is one shorter (2.42 Å) and one longer (2.50 Å) Pr(7)-O(5) bond length. In the eighth Pr site, Pr(8) is bonded in a 7-coordinate geometry to one O(22), two equivalent O(10), two equivalent O(17), and two equivalent O(21) atoms. The Pr(8)-O(22) bond length is 2.26 Å. There is one shorter (2.59 Å) and one longer (2.60 Å) Pr(8)-O(10) bond length. There is one shorter (2.64 Å) and one longer (2.67 Å) Pr(8)-O(17) bond length. There is one shorter (2.52 Å) and one longer (2.54 Å) Pr(8)-O(21) bond length. In the ninth Pr site, Pr(9) is bonded in a 9-coordinate geometry to one O(19), two equivalent O(10), two equivalent O(17), and four equivalent O(18) atoms. The Pr(9)-O(19) bond length is 2.33 Å. There is one shorter (2.56 Å) and one longer (2.57 Å) Pr(9)-O(10) bond length. There is one shorter (2.53 Å) and one longer (2.54 Å) Pr(9)-O(17) bond length. There are a spread of Pr(9)-O(18) bond distances ranging from 2.63-3.08 Å. In the tenth Pr site, Pr(10) is bonded in a 7-coordinate geometry to one O(21), two equivalent O(14), two equivalent O(20), and two equivalent O(22) atoms. The Pr(10)-O(21) bond length is 2.37 Å. There is one shorter (2.46 Å) and one longer (2.48 Å) Pr(10)-O(14) bond length. There is one shorter (2.59 Å) and one longer (2.95 Å) Pr(10)-O(20) bond length. There is one shorter (2.42 Å) and one longer (2.43 Å) Pr(10)-O(22) bond length. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(12), two equivalent O(1), and two equivalent O(3) atoms to form corner-sharing NiO5 trigonal bipyramids. The Ni(1)-O(12) bond length is 2.13 Å. There is one shorter (2.05 Å) and one longer (2.06 Å) Ni(1)-O(1) bond length. There is one shorter (1.98 Å) and one longer (1.99 Å) Ni(1)-O(3) bond length. In the second Ni site, Ni(2) is bonded to one O(11), one O(16), two equivalent O(2), and two equivalent O(9) atoms to form NiO6 octahedra that share corners with four equivalent Ni(2)O6 octahedra and  a cornercorner with one O(15)Pr3O tetrahedra. The corner-sharing octahedral tilt angles range from 10-15°. The Ni(2)-O(11) bond length is 2.27 Å. The Ni(2)-O(16) bond length is 2.22 Å. There is one shorter (2.00 Å) and one longer (2.01 Å) Ni(2)-O(2) bond length. There is one shorter (1.99 Å) and one longer (2.00 Å) Ni(2)-O(9) bond length. In the third Ni site, Ni(3) is bonded to one O(19), one O(5), two equivalent O(13), and two equivalent O(4) atoms to form distorted corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 4-8°. The Ni(3)-O(19) bond length is 2.13 Å. The Ni(3)-O(5) bond length is 2.44 Å. Both Ni(3)-O(13) bond lengths are 1.99 Å. There is one shorter (1.99 Å) and one longer (2.00 Å) Ni(3)-O(4) bond length. In the fourth Ni site, Ni(4) is bonded to one O(18), one O(21), two equivalent O(10), and two equivalent O(17) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 7°. The Ni(4)-O(18) bond length is 2.25 Å. The Ni(4)-O(21) bond length is 2.19 Å. Both Ni(4)-O(10) bond lengths are 2.00 Å. Both Ni(4)-O(17) bond lengths are 1.98 Å. In the fifth Ni site, Ni(5) is bonded in a 6-coordinate geometry to one O(22), one O(6), two equivalent O(14), and two equivalent O(20) atoms. The Ni(5)-O(22) bond length is 2.53 Å. The Ni(5)-O(6) bond length is 2.11 Å. There is one shorter (2.02 Å) and one longer (2.03 Å) Ni(5)-O(14) bond length. There is one shorter (1.98 Å) and one longer (2.00 Å) Ni(5)-O(20) bond length. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), and two equivalent Ni(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Pr(4), two equivalent Pr(5), and two equivalent Ni(2) atoms. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), and two equivalent Ni(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Pr(6), two equivalent Pr(7), and two equivalent Ni(3) atoms to form distorted OPr4Ni2 octahedra that share corners with two equivalent O(4)Pr4Ni2 octahedra, corners with two equivalent O(15)Pr3O tetrahedra, corners with three equivalent O(5)Pr3Ni tetrahedra, edges with two equivalent O(4)Pr4Ni2 octahedra, faces with four equivalent O(13)Pr4Ni2 octahedra, and  a faceface with one O(5)Pr3Ni tetrahedra. The corner-sharing octahedral tilt angles are 4°. In the fifth O site, O(5) is bonded to one Pr(4), two equivalent Pr(7), and one Ni(3) atom to form distorted OPr3Ni tetrahedra that share corners with two equivalent O(13)Pr4Ni2 octahedra, corners with three equivalent O(4)Pr4Ni2 octahedra, corners with two equivalent O(5)Pr3Ni tetrahedra, corners with four equivalent O(15)Pr3O tetrahedra, edges with two equivalent O(13)Pr4Ni2 octahedra, and  a faceface with one O(4)Pr4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 32-81°. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Pr(3), two equivalent Pr(1), and one Ni(5) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(3), and one O(8) atom. The O(7)-O(8) bond length is 1.51 Å. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(3), and one O(7) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to two equivalent Pr(4), two equivalent Pr(5), and two equivalent Ni(2) atoms. In the tenth O site, O(10) is bonded to two equivalent Pr(8), two equivalent Pr(9), and two equivalent Ni(4) atoms to form a mixture of face, corner, and edge-sharing OPr4Ni2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Pr(2), four equivalent Pr(5), and one Ni(2) atom. In the twelfth O site, O(12) is bonded in a distorted see-saw-like geometry to one Pr(5), two equivalent Pr(2), and one Ni(1) atom. In the thirteenth O site, O(13) is bonded to two equivalent Pr(6), two equivalent Pr(7), and two equivalent Ni(3) atoms to form distorted OPr4Ni2 octahedra that share corners with two equivalent O(13)Pr4Ni2 octahedra, corners with two equivalent O(5)Pr3Ni tetrahedra, corners with two equivalent O(15)Pr3O tetrahedra, edges with two equivalent O(13)Pr4Ni2 octahedra, edges with two equivalent O(5)Pr3Ni tetrahedra, and faces with four equivalent O(4)Pr4Ni2 octahedra. The corner-sharing octahedral tilt angles are 8°. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to two equivalent Pr(1), two equivalent Pr(10), and two equivalent Ni(5) atoms. In the fifteenth O site, O(15) is bonded to one Pr(7), two equivalent Pr(4), and one O(16) atom to form distorted OPr3O tetrahedra that share  a cornercorner with one Ni(2)O6 octahedra, corners with two equivalent O(13)Pr4Ni2 octahedra, corners with two equivalent O(4)Pr4Ni2 octahedra, corners with two equivalent O(15)Pr3O tetrahedra, and corners with four equivalent O(5)Pr3Ni tetrahedra. The corner-sharing octahedral tilt angles range from 21-80°. The O(15)-O(16) bond length is 1.48 Å. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Pr(7), two equivalent Pr(4), one Ni(2), and one O(15) atom. In the seventeenth O site, O(17) is bonded to two equivalent Pr(8), two equivalent Pr(9), and two equivalent Ni(4) atoms to form a mixture of distorted face, corner, and edge-sharing OPr4Ni2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the eighteenth O site, O(18) is bonded in a 6-coordinate geometry to one Pr(6), four equivalent Pr(9), and one Ni(4) atom. In the nineteenth O site, O(19) is bonded in a 6-coordinate geometry to one Pr(9), four equivalent Pr(6), and one Ni(3) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to two equivalent Pr(1), two equivalent Pr(10), and two equivalent Ni(5) atoms. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Pr(10), two equivalent Pr(8), and one Ni(4) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Pr(8), two equivalent Pr(10), and one Ni(5) atom.