SrNd(CoO3)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 Co(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 Co(1)O6 octahedra. Co(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Co(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 0-6°. 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 Co(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 Co(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Nd(1) and two equivalent Co(1) atoms.
SrNd(CoO3)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 Co(1)O6 octahedra. All Sr(1)-O(2) bond lengths are 2.67 Å. All Sr(1)-O(1) bond lengths are 2.76 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 Co(1)O6 octahedra. All Nd(1)-O(3) bond lengths are 2.67 Å. All Nd(1)-O(1) bond lengths are 2.58 Å. Co(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Co(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 0-6°. The Co(1)-O(2) bond length is 1.86 Å. The Co(1)-O(3) bond length is 1.91 Å. All Co(1)-O(1) bond lengths are 1.89 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 Co(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 Co(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Nd(1) and two equivalent Co(1) atoms.