NaPr(FeO3)4 crystallizes in the tetragonal P4/mmm space group. Na(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form NaO12 cuboctahedra that share corners with four equivalent Na(1)O12 cuboctahedra, corners with eight equivalent Pr(1)O12 cuboctahedra, and faces with eight equivalent Fe(1)O6 octahedra. Pr(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form PrO12 cuboctahedra that share corners with four equivalent Pr(1)O12 cuboctahedra, corners with eight equivalent Na(1)O12 cuboctahedra, and faces with eight equivalent Fe(1)O6 octahedra. Fe(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Na(1)O12 cuboctahedra, and faces with two equivalent Pr(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 Na(1), one Pr(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to two equivalent Pr(1) and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a distorted square co-planar geometry to two equivalent Na(1) and two equivalent Fe(1) atoms.
NaPr(FeO3)4 crystallizes in the tetragonal P4/mmm space group. Na(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form NaO12 cuboctahedra that share corners with four equivalent Na(1)O12 cuboctahedra, corners with eight equivalent Pr(1)O12 cuboctahedra, and faces with eight equivalent Fe(1)O6 octahedra. All Na(1)-O(3) bond lengths are 2.70 Å. All Na(1)-O(1) bond lengths are 2.80 Å. Pr(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form PrO12 cuboctahedra that share corners with four equivalent Pr(1)O12 cuboctahedra, corners with eight equivalent Na(1)O12 cuboctahedra, and faces with eight equivalent Fe(1)O6 octahedra. All Pr(1)-O(2) bond lengths are 2.70 Å. All Pr(1)-O(1) bond lengths are 2.62 Å. Fe(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Na(1)O12 cuboctahedra, and faces with two equivalent Pr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-8°. The Fe(1)-O(2) bond length is 1.97 Å. The Fe(1)-O(3) bond length is 1.88 Å. All Fe(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 Na(1), one Pr(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to two equivalent Pr(1) and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a distorted square co-planar geometry to two equivalent Na(1) and two equivalent Fe(1) atoms.