LiEu2CoO4 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a 4-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent O(1), and two equivalent O(4) atoms. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 11-coordinate geometry to two equivalent Li(1), one O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. In the second Eu site, Eu(2) is bonded in a 11-coordinate geometry to two equivalent Li(1), one O(4), two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Co(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 3°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 8-coordinate geometry to two equivalent Li(1), one Eu(1), four equivalent Eu(2), and one Co(1) atom. In the second O site, O(2) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Co(1) atoms to form a mixture of distorted edge, face, and corner-sharing OEu4Co2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the third O site, O(3) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Co(1) atoms to form a mixture of distorted edge, face, and corner-sharing OEu4Co2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the fourth O site, O(4) is bonded in a 8-coordinate geometry to two equivalent Li(1), one Eu(2), four equivalent Eu(1), and one Co(1) atom.
LiEu2CoO4 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a 4-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent O(1), and two equivalent O(4) atoms. Both Li(1)-Eu(1) bond lengths are 2.56 Å. Both Li(1)-Eu(2) bond lengths are 2.56 Å. Both Li(1)-O(1) bond lengths are 2.12 Å. There is one shorter (2.11 Å) and one longer (2.12 Å) Li(1)-O(4) bond length. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 11-coordinate geometry to two equivalent Li(1), one O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. The Eu(1)-O(1) bond length is 2.56 Å. Both Eu(1)-O(2) bond lengths are 2.52 Å. There is one shorter (2.59 Å) and one longer (2.60 Å) Eu(1)-O(3) bond length. There are two shorter (2.83 Å) and two longer (2.86 Å) Eu(1)-O(4) bond lengths. In the second Eu site, Eu(2) is bonded in a 11-coordinate geometry to two equivalent Li(1), one O(4), two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. The Eu(2)-O(4) bond length is 2.56 Å. Both Eu(2)-O(2) bond lengths are 2.59 Å. Both Eu(2)-O(3) bond lengths are 2.52 Å. There are two shorter (2.84 Å) and two longer (2.85 Å) Eu(2)-O(1) bond lengths. Co(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 3°. The Co(1)-O(1) bond length is 2.49 Å. The Co(1)-O(4) bond length is 2.49 Å. Both Co(1)-O(2) bond lengths are 1.93 Å. Both Co(1)-O(3) bond lengths are 1.93 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 8-coordinate geometry to two equivalent Li(1), one Eu(1), four equivalent Eu(2), and one Co(1) atom. In the second O site, O(2) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Co(1) atoms to form a mixture of distorted edge, face, and corner-sharing OEu4Co2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the third O site, O(3) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Co(1) atoms to form a mixture of distorted edge, face, and corner-sharing OEu4Co2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the fourth O site, O(4) is bonded in a 8-coordinate geometry to two equivalent Li(1), one Eu(2), four equivalent Eu(1), and one Co(1) atom.