PrMn7O12 crystallizes in the trigonal R-3 space group. Pr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form PrO12 cuboctahedra that share faces with two equivalent Mn(2)O6 octahedra and faces with six equivalent Mn(3)O6 octahedra. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Mn site, Mn(2) is bonded to six equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Mn(3)O6 octahedra and faces with two equivalent Pr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 43°. In the third Mn site, Mn(3) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(3)O6 octahedra, and faces with two equivalent Pr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-43°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Pr(1), one Mn(1), and two equivalent Mn(3) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Pr(1), one Mn(1), one Mn(2), and one Mn(3) atom.
PrMn7O12 crystallizes in the trigonal R-3 space group. Pr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form PrO12 cuboctahedra that share faces with two equivalent Mn(2)O6 octahedra and faces with six equivalent Mn(3)O6 octahedra. All Pr(1)-O(1) bond lengths are 2.71 Å. All Pr(1)-O(2) bond lengths are 2.66 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Mn(1)-O(1) bond lengths are 1.98 Å. Both Mn(1)-O(2) bond lengths are 1.96 Å. In the second Mn site, Mn(2) is bonded to six equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Mn(3)O6 octahedra and faces with two equivalent Pr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 43°. All Mn(2)-O(2) bond lengths are 1.98 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(3)O6 octahedra, and faces with two equivalent Pr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 41-43°. Both Mn(3)-O(2) bond lengths are 2.10 Å. There are two shorter (2.00 Å) and two longer (2.05 Å) Mn(3)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Pr(1), one Mn(1), and two equivalent Mn(3) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Pr(1), one Mn(1), one Mn(2), and one Mn(3) atom.