SrNd(NiO3)4 crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Nd(1)O12 cuboctahedra, and faces with eight equivalent Ni(1)O6 octahedra. Nd(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form NdO12 cuboctahedra that share corners with four equivalent Nd(1)O12 cuboctahedra, corners with eight equivalent Sr(1)O12 cuboctahedra, and faces with eight equivalent Ni(1)O6 octahedra. Ni(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-8°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted square co-planar geometry to one Sr(1), one Nd(1), and two equivalent Ni(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to two equivalent Sr(1) and two equivalent Ni(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Nd(1) and two equivalent Ni(1) atoms.
SrNd(NiO3)4 crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Nd(1)O12 cuboctahedra, and faces with eight equivalent Ni(1)O6 octahedra. All Sr(1)-O(2) bond lengths are 2.70 Å. All Sr(1)-O(1) bond lengths are 2.82 Å. Nd(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form NdO12 cuboctahedra that share corners with four equivalent Nd(1)O12 cuboctahedra, corners with eight equivalent Sr(1)O12 cuboctahedra, and faces with eight equivalent Ni(1)O6 octahedra. All Nd(1)-O(3) bond lengths are 2.70 Å. All Nd(1)-O(1) bond lengths are 2.58 Å. Ni(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-8°. The Ni(1)-O(2) bond length is 1.91 Å. The Ni(1)-O(3) bond length is 1.92 Å. All Ni(1)-O(1) bond lengths are 1.91 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted square co-planar geometry to one Sr(1), one Nd(1), and two equivalent Ni(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to two equivalent Sr(1) and two equivalent Ni(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Nd(1) and two equivalent Ni(1) atoms.