Pr3SbO7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted PrO7 pentagonal bipyramids that share corners with two equivalent Sb(1)O6 octahedra, corners with three equivalent Pr(1)O7 pentagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Pr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. In the second Pr site, Pr(2) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Sb(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Pr(1)O7 pentagonal bipyramids, and edges with four equivalent Pr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 34°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form a mixture of corner and edge-sharing OPr4 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Sb(1) atom.
Pr3SbO7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted PrO7 pentagonal bipyramids that share corners with two equivalent Sb(1)O6 octahedra, corners with three equivalent Pr(1)O7 pentagonal bipyramids, edges with two equivalent Sb(1)O6 octahedra, and edges with two equivalent Pr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. The Pr(1)-O(1) bond length is 2.68 Å. There is one shorter (2.32 Å) and one longer (2.33 Å) Pr(1)-O(2) bond length. There are two shorter (2.47 Å) and two longer (2.48 Å) Pr(1)-O(3) bond lengths. In the second Pr site, Pr(2) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. All Pr(2)-O(2) bond lengths are 2.42 Å. All Pr(2)-O(3) bond lengths are 2.77 Å. Sb(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with four equivalent Pr(1)O7 pentagonal bipyramids, and edges with four equivalent Pr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 34°. Both Sb(1)-O(1) bond lengths are 2.02 Å. All Sb(1)-O(3) bond lengths are 1.98 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Pr(1) and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form a mixture of corner and edge-sharing OPr4 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), and one Sb(1) atom.