Y(NiO2)2 is Spinel structured and crystallizes in the trigonal R-3m space group. Y(1) is bonded to one O(2) and three equivalent O(1) atoms to form YO4 tetrahedra that share corners with three equivalent Ni(2)O6 octahedra and corners with nine equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-61°. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Y(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and edges with four equivalent Ni(1)O6 octahedra. In the second Ni site, Ni(2) is bonded to six equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Y(1)O4 tetrahedra and edges with six equivalent Ni(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Ni(2), and two equivalent Ni(1) atoms to form a mixture of distorted edge and corner-sharing OYNi3 tetrahedra. In the second O site, O(2) is bonded to one Y(1) and three equivalent Ni(1) atoms to form a mixture of distorted edge and corner-sharing OYNi3 trigonal pyramids.
Y(NiO2)2 is Spinel structured and crystallizes in the trigonal R-3m space group. Y(1) is bonded to one O(2) and three equivalent O(1) atoms to form YO4 tetrahedra that share corners with three equivalent Ni(2)O6 octahedra and corners with nine equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-61°. The Y(1)-O(2) bond length is 2.13 Å. All Y(1)-O(1) bond lengths are 2.15 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Y(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and edges with four equivalent Ni(1)O6 octahedra. Both Ni(1)-O(2) bond lengths are 2.10 Å. All Ni(1)-O(1) bond lengths are 2.04 Å. In the second Ni site, Ni(2) is bonded to six equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Y(1)O4 tetrahedra and edges with six equivalent Ni(1)O6 octahedra. All Ni(2)-O(1) bond lengths are 2.08 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Ni(2), and two equivalent Ni(1) atoms to form a mixture of distorted edge and corner-sharing OYNi3 tetrahedra. In the second O site, O(2) is bonded to one Y(1) and three equivalent Ni(1) atoms to form a mixture of distorted edge and corner-sharing OYNi3 trigonal pyramids.