Y(NiO2)2 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. Y(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form YO6 octahedra that share corners with six equivalent Ni(1)O4 tetrahedra, edges with two equivalent Y(1)O6 octahedra, and edges with four equivalent Ni(2)O6 octahedra. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NiO4 tetrahedra that share corners with six equivalent Y(1)O6 octahedra and corners with six equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-60°. In the second Ni site, Ni(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Ni(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and edges with four equivalent Y(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Y(1), one Ni(1), and two equivalent Ni(2) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Y(1), one Ni(1), and one Ni(2) atom.
Y(NiO2)2 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. Y(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form YO6 octahedra that share corners with six equivalent Ni(1)O4 tetrahedra, edges with two equivalent Y(1)O6 octahedra, and edges with four equivalent Ni(2)O6 octahedra. Both Y(1)-O(1) bond lengths are 2.26 Å. All Y(1)-O(2) bond lengths are 2.24 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NiO4 tetrahedra that share corners with six equivalent Y(1)O6 octahedra and corners with six equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-60°. Both Ni(1)-O(1) bond lengths are 1.92 Å. Both Ni(1)-O(2) bond lengths are 1.90 Å. In the second Ni site, Ni(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Ni(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and edges with four equivalent Y(1)O6 octahedra. Both Ni(2)-O(2) bond lengths are 2.08 Å. All Ni(2)-O(1) bond lengths are 2.22 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Y(1), one Ni(1), and two equivalent Ni(2) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Y(1), one Ni(1), and one Ni(2) atom.