ErYAl2O6 is Orthorhombic Perovskite-derived structured and crystallizes in the orthorhombic Pmc2_1 space group. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. Y(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Al(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 28-30°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Er(1), two equivalent Y(1), and two equivalent Al(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Er(1), one Y(1), and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Y(1) and two equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Er(1) and two equivalent Al(1) atoms.
ErYAl2O6 is Orthorhombic Perovskite-derived structured and crystallizes in the orthorhombic Pmc2_1 space group. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. Both Er(1)-O(1) bond lengths are 2.56 Å. There is one shorter (2.24 Å) and one longer (2.29 Å) Er(1)-O(4) bond length. There are two shorter (2.28 Å) and two longer (2.46 Å) Er(1)-O(2) bond lengths. Y(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Both Y(1)-O(2) bond lengths are 2.59 Å. There is one shorter (2.26 Å) and one longer (2.32 Å) Y(1)-O(3) bond length. There are two shorter (2.29 Å) and two longer (2.49 Å) Y(1)-O(1) bond lengths. Al(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 28-30°. The Al(1)-O(3) bond length is 1.92 Å. The Al(1)-O(4) bond length is 1.91 Å. There is one shorter (1.92 Å) and one longer (1.94 Å) Al(1)-O(1) bond length. There is one shorter (1.92 Å) and one longer (1.95 Å) Al(1)-O(2) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Er(1), two equivalent Y(1), and two equivalent Al(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Er(1), one Y(1), and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Y(1) and two equivalent Al(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Er(1) and two equivalent Al(1) atoms.