Eu2O3 is Corundum-like structured and crystallizes in the triclinic P-1 space group. There are ten inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the second Eu site, Eu(2) is bonded to two equivalent O(2), two equivalent O(7), and two equivalent O(9) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the third Eu site, Eu(3) is bonded to two equivalent O(10), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the fourth Eu site, Eu(4) is bonded to two equivalent O(12), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the fifth Eu site, Eu(5) is bonded to one O(10), one O(12), one O(3), one O(4), one O(6), and one O(7) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the sixth Eu site, Eu(6) is bonded to one O(1), one O(11), one O(2), one O(5), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the seventh Eu site, Eu(7) is bonded to one O(10), one O(11), one O(2), one O(4), one O(7), and one O(8) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 56°. In the eighth Eu site, Eu(8) is bonded to one O(1), one O(12), one O(3), one O(5), one O(6), and one O(9) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 56°. In the ninth Eu site, Eu(9) is bonded to one O(11), one O(12), one O(2), one O(3), one O(6), and one O(8) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the tenth Eu site, Eu(10) is bonded to one O(1), one O(10), one O(4), one O(5), one O(7), and one O(9) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(10), one Eu(6), and one Eu(8) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded to one Eu(2), one Eu(6), one Eu(7), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the third O site, O(3) is bonded to one Eu(3), one Eu(5), one Eu(8), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the fourth O site, O(4) is bonded to one Eu(10), one Eu(4), one Eu(5), and one Eu(7) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the fifth O site, O(5) is bonded to one Eu(10), one Eu(3), one Eu(6), and one Eu(8) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the sixth O site, O(6) is bonded to one Eu(1), one Eu(5), one Eu(8), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the seventh O site, O(7) is bonded to one Eu(10), one Eu(2), one Eu(5), and one Eu(7) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the eighth O site, O(8) is bonded to one Eu(4), one Eu(6), one Eu(7), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the ninth O site, O(9) is bonded to one Eu(10), one Eu(2), one Eu(6), and one Eu(8) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the tenth O site, O(10) is bonded to one Eu(10), one Eu(3), one Eu(5), and one Eu(7) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the eleventh O site, O(11) is bonded to one Eu(1), one Eu(6), one Eu(7), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the twelfth O site, O(12) is bonded to one Eu(4), one Eu(5), one Eu(8), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra.
Eu2O3 is Corundum-like structured and crystallizes in the triclinic P-1 space group. There are ten inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. Both Eu(1)-O(1) bond lengths are 2.34 Å. Both Eu(1)-O(11) bond lengths are 2.34 Å. Both Eu(1)-O(6) bond lengths are 2.36 Å. In the second Eu site, Eu(2) is bonded to two equivalent O(2), two equivalent O(7), and two equivalent O(9) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. Both Eu(2)-O(2) bond lengths are 2.35 Å. Both Eu(2)-O(7) bond lengths are 2.34 Å. Both Eu(2)-O(9) bond lengths are 2.34 Å. In the third Eu site, Eu(3) is bonded to two equivalent O(10), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. Both Eu(3)-O(10) bond lengths are 2.36 Å. Both Eu(3)-O(3) bond lengths are 2.34 Å. Both Eu(3)-O(5) bond lengths are 2.34 Å. In the fourth Eu site, Eu(4) is bonded to two equivalent O(12), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. Both Eu(4)-O(12) bond lengths are 2.34 Å. Both Eu(4)-O(4) bond lengths are 2.34 Å. Both Eu(4)-O(8) bond lengths are 2.35 Å. In the fifth Eu site, Eu(5) is bonded to one O(10), one O(12), one O(3), one O(4), one O(6), and one O(7) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. The Eu(5)-O(10) bond length is 2.38 Å. The Eu(5)-O(12) bond length is 2.38 Å. The Eu(5)-O(3) bond length is 2.36 Å. The Eu(5)-O(4) bond length is 2.34 Å. The Eu(5)-O(6) bond length is 2.30 Å. The Eu(5)-O(7) bond length is 2.31 Å. In the sixth Eu site, Eu(6) is bonded to one O(1), one O(11), one O(2), one O(5), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. The Eu(6)-O(1) bond length is 2.35 Å. The Eu(6)-O(11) bond length is 2.38 Å. The Eu(6)-O(2) bond length is 2.37 Å. The Eu(6)-O(5) bond length is 2.31 Å. The Eu(6)-O(8) bond length is 2.30 Å. The Eu(6)-O(9) bond length is 2.37 Å. In the seventh Eu site, Eu(7) is bonded to one O(10), one O(11), one O(2), one O(4), one O(7), and one O(8) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 56°. The Eu(7)-O(10) bond length is 2.26 Å. The Eu(7)-O(11) bond length is 2.28 Å. The Eu(7)-O(2) bond length is 2.32 Å. The Eu(7)-O(4) bond length is 2.36 Å. The Eu(7)-O(7) bond length is 2.34 Å. The Eu(7)-O(8) bond length is 2.34 Å. In the eighth Eu site, Eu(8) is bonded to one O(1), one O(12), one O(3), one O(5), one O(6), and one O(9) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 56°. The Eu(8)-O(1) bond length is 2.37 Å. The Eu(8)-O(12) bond length is 2.29 Å. The Eu(8)-O(3) bond length is 2.37 Å. The Eu(8)-O(5) bond length is 2.33 Å. The Eu(8)-O(6) bond length is 2.32 Å. The Eu(8)-O(9) bond length is 2.30 Å. In the ninth Eu site, Eu(9) is bonded to one O(11), one O(12), one O(2), one O(3), one O(6), and one O(8) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. The Eu(9)-O(11) bond length is 2.36 Å. The Eu(9)-O(12) bond length is 2.35 Å. The Eu(9)-O(2) bond length is 2.31 Å. The Eu(9)-O(3) bond length is 2.29 Å. The Eu(9)-O(6) bond length is 2.37 Å. The Eu(9)-O(8) bond length is 2.37 Å. In the tenth Eu site, Eu(10) is bonded to one O(1), one O(10), one O(4), one O(5), one O(7), and one O(9) atom to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. The Eu(10)-O(1) bond length is 2.29 Å. The Eu(10)-O(10) bond length is 2.38 Å. The Eu(10)-O(4) bond length is 2.31 Å. The Eu(10)-O(5) bond length is 2.39 Å. The Eu(10)-O(7) bond length is 2.37 Å. The Eu(10)-O(9) bond length is 2.36 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(10), one Eu(6), and one Eu(8) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded to one Eu(2), one Eu(6), one Eu(7), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the third O site, O(3) is bonded to one Eu(3), one Eu(5), one Eu(8), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the fourth O site, O(4) is bonded to one Eu(10), one Eu(4), one Eu(5), and one Eu(7) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the fifth O site, O(5) is bonded to one Eu(10), one Eu(3), one Eu(6), and one Eu(8) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the sixth O site, O(6) is bonded to one Eu(1), one Eu(5), one Eu(8), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the seventh O site, O(7) is bonded to one Eu(10), one Eu(2), one Eu(5), and one Eu(7) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the eighth O site, O(8) is bonded to one Eu(4), one Eu(6), one Eu(7), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the ninth O site, O(9) is bonded to one Eu(10), one Eu(2), one Eu(6), and one Eu(8) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the tenth O site, O(10) is bonded to one Eu(10), one Eu(3), one Eu(5), and one Eu(7) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the eleventh O site, O(11) is bonded to one Eu(1), one Eu(6), one Eu(7), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the twelfth O site, O(12) is bonded to one Eu(4), one Eu(5), one Eu(8), and one Eu(9) atom to form a mixture of corner and edge-sharing OEu4 tetrahedra.