Y2O3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. In the second Y site, Y(2) is bonded in a 7-coordinate geometry to one O(3), three equivalent O(1), and three equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Y(1) and three equivalent Y(2) atoms to form a mixture of distorted corner and edge-sharing OY5 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Y(1) and three equivalent Y(2) atoms to form a mixture of distorted corner, edge, and face-sharing OY5 trigonal bipyramids. In the third O site, O(3) is bonded to one Y(2) and four equivalent Y(1) atoms to form a mixture of distorted corner, edge, and face-sharing OY5 trigonal bipyramids.
Y2O3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. There is one shorter (2.38 Å) and one longer (2.68 Å) Y(1)-O(1) bond length. Both Y(1)-O(2) bond lengths are 2.44 Å. There are two shorter (2.29 Å) and two longer (2.53 Å) Y(1)-O(3) bond lengths. In the second Y site, Y(2) is bonded in a 7-coordinate geometry to one O(3), three equivalent O(1), and three equivalent O(2) atoms. The Y(2)-O(3) bond length is 2.33 Å. There are two shorter (2.24 Å) and one longer (2.65 Å) Y(2)-O(1) bond length. There are two shorter (2.36 Å) and one longer (2.40 Å) Y(2)-O(2) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Y(1) and three equivalent Y(2) atoms to form a mixture of distorted corner and edge-sharing OY5 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Y(1) and three equivalent Y(2) atoms to form a mixture of distorted corner, edge, and face-sharing OY5 trigonal bipyramids. In the third O site, O(3) is bonded to one Y(2) and four equivalent Y(1) atoms to form a mixture of distorted corner, edge, and face-sharing OY5 trigonal bipyramids.