EuY2O4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(1), two equivalent O(4), and three equivalent O(2) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the second Y site, Y(2) is bonded to one O(5), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. In the third Y site, Y(3) is bonded to one O(4), two equivalent O(8), and three equivalent O(6) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the fourth Y site, Y(4) is bonded to one O(8), two equivalent O(5), and three equivalent O(7) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(2), one Y(1), and two equivalent Y(2) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Eu(2) and three equivalent Y(1) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Eu(1) and three equivalent Y(2) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Eu(1), one Y(3), and two equivalent Y(1) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Eu(2), one Y(2), and two equivalent Y(4) atoms. In the sixth O site, O(6) is bonded to two equivalent Eu(2) and three equivalent Y(3) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the seventh O site, O(7) is bonded to two equivalent Eu(1) and three equivalent Y(4) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Eu(1), one Eu(2), one Y(4), and two equivalent Y(3) atoms.
EuY2O4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. The Eu(1)-O(1) bond length is 2.82 Å. The Eu(1)-O(8) bond length is 2.94 Å. Both Eu(1)-O(3) bond lengths are 2.59 Å. Both Eu(1)-O(4) bond lengths are 2.72 Å. Both Eu(1)-O(7) bond lengths are 2.61 Å. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. The Eu(2)-O(1) bond length is 2.83 Å. The Eu(2)-O(8) bond length is 2.76 Å. Both Eu(2)-O(2) bond lengths are 2.62 Å. Both Eu(2)-O(5) bond lengths are 2.74 Å. Both Eu(2)-O(6) bond lengths are 2.61 Å. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(1), two equivalent O(4), and three equivalent O(2) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. The Y(1)-O(1) bond length is 2.28 Å. Both Y(1)-O(4) bond lengths are 2.32 Å. There is one shorter (2.28 Å) and two longer (2.37 Å) Y(1)-O(2) bond lengths. In the second Y site, Y(2) is bonded to one O(5), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. The Y(2)-O(5) bond length is 2.29 Å. Both Y(2)-O(1) bond lengths are 2.23 Å. There is one shorter (2.30 Å) and two longer (2.39 Å) Y(2)-O(3) bond lengths. In the third Y site, Y(3) is bonded to one O(4), two equivalent O(8), and three equivalent O(6) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. The Y(3)-O(4) bond length is 2.30 Å. Both Y(3)-O(8) bond lengths are 2.22 Å. There is one shorter (2.32 Å) and two longer (2.38 Å) Y(3)-O(6) bond lengths. In the fourth Y site, Y(4) is bonded to one O(8), two equivalent O(5), and three equivalent O(7) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. The Y(4)-O(8) bond length is 2.27 Å. Both Y(4)-O(5) bond lengths are 2.32 Å. There is one shorter (2.28 Å) and two longer (2.34 Å) Y(4)-O(7) bond lengths. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(2), one Y(1), and two equivalent Y(2) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Eu(2) and three equivalent Y(1) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Eu(1) and three equivalent Y(2) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Eu(1), one Y(3), and two equivalent Y(1) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Eu(2), one Y(2), and two equivalent Y(4) atoms. In the sixth O site, O(6) is bonded to two equivalent Eu(2) and three equivalent Y(3) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the seventh O site, O(7) is bonded to two equivalent Eu(1) and three equivalent Y(4) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Eu(1), one Eu(2), one Y(4), and two equivalent Y(3) atoms.