Pr2La2O7 crystallizes in the cubic Fd-3m space group. Pr(1) is bonded to six equivalent O(2) atoms to form distorted corner-sharing PrO6 octahedra. The corner-sharing octahedral tilt angles are 62°. La(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent La(1) atoms to form OLa4 tetrahedra that share corners with four equivalent O(1)La4 tetrahedra, corners with twelve equivalent O(2)La2Pr2 tetrahedra, and edges with six equivalent O(2)La2Pr2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent La(1) atoms to form OLa2Pr2 tetrahedra that share corners with two equivalent O(1)La4 tetrahedra, corners with twelve equivalent O(2)La2Pr2 tetrahedra,  an edgeedge with one O(1)La4 tetrahedra, and edges with four equivalent O(2)La2Pr2 tetrahedra.
Pr2La2O7 crystallizes in the cubic Fd-3m space group. Pr(1) is bonded to six equivalent O(2) atoms to form distorted corner-sharing PrO6 octahedra. The corner-sharing octahedral tilt angles are 62°. All Pr(1)-O(2) bond lengths are 2.36 Å. La(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. Both La(1)-O(1) bond lengths are 2.49 Å. All La(1)-O(2) bond lengths are 2.62 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent La(1) atoms to form OLa4 tetrahedra that share corners with four equivalent O(1)La4 tetrahedra, corners with twelve equivalent O(2)La2Pr2 tetrahedra, and edges with six equivalent O(2)La2Pr2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent La(1) atoms to form OLa2Pr2 tetrahedra that share corners with two equivalent O(1)La4 tetrahedra, corners with twelve equivalent O(2)La2Pr2 tetrahedra,  an edgeedge with one O(1)La4 tetrahedra, and edges with four equivalent O(2)La2Pr2 tetrahedra.