Eu2Cu2O5 crystallizes in the orthorhombic Ima2 space group. Eu(1) is bonded in a 8-coordinate geometry to one O(3), three equivalent O(2), and four equivalent O(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CuO6 octahedra that share corners with four equivalent Cu(1)O6 octahedra and corners with two equivalent Cu(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 11°. In the second Cu site, Cu(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form CuO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra and corners with two equivalent Cu(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 31°. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) and two equivalent Cu(1) atoms to form distorted OEu4Cu2 octahedra that share corners with two equivalent O(1)Eu4Cu2 octahedra, corners with four equivalent O(3)Eu2Cu2 tetrahedra, edges with two equivalent O(1)Eu4Cu2 octahedra, and faces with four equivalent O(1)Eu4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Eu(1), one Cu(1), and one Cu(2) atom. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Cu(2) atoms to form OEu2Cu2 tetrahedra that share corners with eight equivalent O(1)Eu4Cu2 octahedra and corners with two equivalent O(3)Eu2Cu2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-73°.
Eu2Cu2O5 crystallizes in the orthorhombic Ima2 space group. Eu(1) is bonded in a 8-coordinate geometry to one O(3), three equivalent O(2), and four equivalent O(1) atoms. The Eu(1)-O(3) bond length is 2.31 Å. There are a spread of Eu(1)-O(2) bond distances ranging from 2.38-2.87 Å. There are a spread of Eu(1)-O(1) bond distances ranging from 2.53-2.69 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CuO6 octahedra that share corners with four equivalent Cu(1)O6 octahedra and corners with two equivalent Cu(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 11°. Both Cu(1)-O(2) bond lengths are 2.16 Å. There are two shorter (1.93 Å) and two longer (1.94 Å) Cu(1)-O(1) bond lengths. In the second Cu site, Cu(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form CuO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra and corners with two equivalent Cu(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 31°. Both Cu(2)-O(2) bond lengths are 1.90 Å. There is one shorter (2.01 Å) and one longer (2.05 Å) Cu(2)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) and two equivalent Cu(1) atoms to form distorted OEu4Cu2 octahedra that share corners with two equivalent O(1)Eu4Cu2 octahedra, corners with four equivalent O(3)Eu2Cu2 tetrahedra, edges with two equivalent O(1)Eu4Cu2 octahedra, and faces with four equivalent O(1)Eu4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Eu(1), one Cu(1), and one Cu(2) atom. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Cu(2) atoms to form OEu2Cu2 tetrahedra that share corners with eight equivalent O(1)Eu4Cu2 octahedra and corners with two equivalent O(3)Eu2Cu2 tetrahedra. The corner-sharing octahedral tilt angles range from 23-73°.