Eu2Zr2O7 crystallizes in the cubic Fd-3m space group. Eu(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Zr(1) is bonded to six equivalent O(1) atoms to form corner-sharing ZrO6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Zr(1) atoms to form distorted OEu2Zr2 tetrahedra that share corners with two equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Zr2 tetrahedra,  an edgeedge with one O(2)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Zr2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Zr2 tetrahedra, and edges with six equivalent O(1)Eu2Zr2 tetrahedra.
Eu2Zr2O7 crystallizes in the cubic Fd-3m space group. Eu(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Both Eu(1)-O(2) bond lengths are 2.30 Å. All Eu(1)-O(1) bond lengths are 2.56 Å. Zr(1) is bonded to six equivalent O(1) atoms to form corner-sharing ZrO6 octahedra. The corner-sharing octahedral tilt angles are 52°. All Zr(1)-O(1) bond lengths are 2.09 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Zr(1) atoms to form distorted OEu2Zr2 tetrahedra that share corners with two equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Zr2 tetrahedra,  an edgeedge with one O(2)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Zr2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Zr2 tetrahedra, and edges with six equivalent O(1)Eu2Zr2 tetrahedra.