NaPrNb4O12 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 Nb(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 Nb(1)O6 octahedra. Nb(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Nb(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 linear geometry to one Na(1), one Pr(1), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Pr(1) and two equivalent Nb(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 Nb(1) atoms.
NaPrNb4O12 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 Nb(1)O6 octahedra. All Na(1)-O(3) bond lengths are 2.82 Å. All Na(1)-O(1) bond lengths are 2.95 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 Nb(1)O6 octahedra. All Pr(1)-O(2) bond lengths are 2.82 Å. All Pr(1)-O(1) bond lengths are 2.71 Å. Nb(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Nb(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 Nb(1)-O(2) bond length is 2.02 Å. The Nb(1)-O(3) bond length is 1.98 Å. All Nb(1)-O(1) bond lengths are 2.00 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Na(1), one Pr(1), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Pr(1) and two equivalent Nb(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 Nb(1) atoms.