Eu2Sc2O5 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 Sc sites. In the first Sc site, Sc(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ScO6 octahedra that share corners with four equivalent Sc(1)O6 octahedra and corners with two equivalent Sc(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 11°. In the second Sc site, Sc(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form ScO4 tetrahedra that share corners with two equivalent Sc(1)O6 octahedra and corners with two equivalent Sc(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 39°. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) and two equivalent Sc(1) atoms to form distorted OEu4Sc2 octahedra that share corners with two equivalent O(1)Eu4Sc2 octahedra, corners with four equivalent O(3)Eu2Sc2 tetrahedra, edges with two equivalent O(1)Eu4Sc2 octahedra, and faces with four equivalent O(1)Eu4Sc2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Eu(1), one Sc(1), and one Sc(2) atom. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Sc(2) atoms to form distorted OEu2Sc2 tetrahedra that share corners with eight equivalent O(1)Eu4Sc2 octahedra and corners with two equivalent O(3)Eu2Sc2 tetrahedra. The corner-sharing octahedral tilt angles range from 21-82°.
Eu2Sc2O5 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 2.49 Å. There are a spread of Eu(1)-O(2) bond distances ranging from 2.46-3.09 Å. There are a spread of Eu(1)-O(1) bond distances ranging from 2.64-2.72 Å. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ScO6 octahedra that share corners with four equivalent Sc(1)O6 octahedra and corners with two equivalent Sc(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 11°. Both Sc(1)-O(2) bond lengths are 2.20 Å. There are two shorter (2.08 Å) and two longer (2.09 Å) Sc(1)-O(1) bond lengths. In the second Sc site, Sc(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form ScO4 tetrahedra that share corners with two equivalent Sc(1)O6 octahedra and corners with two equivalent Sc(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 39°. Both Sc(2)-O(2) bond lengths are 1.97 Å. There is one shorter (2.03 Å) and one longer (2.05 Å) Sc(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 Sc(1) atoms to form distorted OEu4Sc2 octahedra that share corners with two equivalent O(1)Eu4Sc2 octahedra, corners with four equivalent O(3)Eu2Sc2 tetrahedra, edges with two equivalent O(1)Eu4Sc2 octahedra, and faces with four equivalent O(1)Eu4Sc2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Eu(1), one Sc(1), and one Sc(2) atom. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Sc(2) atoms to form distorted OEu2Sc2 tetrahedra that share corners with eight equivalent O(1)Eu4Sc2 octahedra and corners with two equivalent O(3)Eu2Sc2 tetrahedra. The corner-sharing octahedral tilt angles range from 21-82°.