Pr2Y2O5 crystallizes in the tetragonal P4/mmm space group. Pr(1) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(1) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. In the second Y site, Y(2) is bonded in a square co-planar geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(1) and two equivalent Y(1) atoms to form OPr2Y2 tetrahedra that share corners with two equivalent O(2)Pr2Y4 octahedra, corners with ten equivalent O(1)Pr2Y2 tetrahedra, and edges with five equivalent O(1)Pr2Y2 tetrahedra. The corner-sharing octahedral tilt angles are 60°. In the second O site, O(2) is bonded to two equivalent Pr(1) and four equivalent Y(2) atoms to form OPr2Y4 octahedra that share corners with four equivalent O(2)Pr2Y4 octahedra, corners with eight equivalent O(1)Pr2Y2 tetrahedra, and edges with four equivalent O(2)Pr2Y4 octahedra. The corner-sharing octahedra are not tilted.
Pr2Y2O5 crystallizes in the tetragonal P4/mmm space group. Pr(1) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(1) atoms. The Pr(1)-O(2) bond length is 2.87 Å. All Pr(1)-O(1) bond lengths are 2.25 Å. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Y(1)-O(1) bond lengths are 2.40 Å. In the second Y site, Y(2) is bonded in a square co-planar geometry to four equivalent O(2) atoms. All Y(2)-O(2) bond lengths are 2.77 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(1) and two equivalent Y(1) atoms to form OPr2Y2 tetrahedra that share corners with two equivalent O(2)Pr2Y4 octahedra, corners with ten equivalent O(1)Pr2Y2 tetrahedra, and edges with five equivalent O(1)Pr2Y2 tetrahedra. The corner-sharing octahedral tilt angles are 60°. In the second O site, O(2) is bonded to two equivalent Pr(1) and four equivalent Y(2) atoms to form OPr2Y4 octahedra that share corners with four equivalent O(2)Pr2Y4 octahedra, corners with eight equivalent O(1)Pr2Y2 tetrahedra, and edges with four equivalent O(2)Pr2Y4 octahedra. The corner-sharing octahedra are not tilted.