ZnAl2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. Zn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Al(1)O4 tetrahedra, edges with two equivalent Zn(1)O6 octahedra, and edges with four equivalent Al(2)O6 octahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AlO4 tetrahedra that share corners with six equivalent Zn(1)O6 octahedra and corners with six equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-58°. In the second Al site, Al(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form AlO6 octahedra that share corners with six equivalent Al(1)O4 tetrahedra, edges with two equivalent Al(2)O6 octahedra, and edges with four equivalent Zn(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 two equivalent Zn(1), one Al(1), and one Al(2) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Zn(1), one Al(1), and two equivalent Al(2) atoms.
ZnAl2O4 is Spinel-like structured and crystallizes in the orthorhombic Imma space group. Zn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ZnO6 octahedra that share corners with six equivalent Al(1)O4 tetrahedra, edges with two equivalent Zn(1)O6 octahedra, and edges with four equivalent Al(2)O6 octahedra. Both Zn(1)-O(2) bond lengths are 2.12 Å. All Zn(1)-O(1) bond lengths are 2.07 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AlO4 tetrahedra that share corners with six equivalent Zn(1)O6 octahedra and corners with six equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-58°. Both Al(1)-O(1) bond lengths are 1.80 Å. Both Al(1)-O(2) bond lengths are 1.84 Å. In the second Al site, Al(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form AlO6 octahedra that share corners with six equivalent Al(1)O4 tetrahedra, edges with two equivalent Al(2)O6 octahedra, and edges with four equivalent Zn(1)O6 octahedra. Both Al(2)-O(1) bond lengths are 1.91 Å. All Al(2)-O(2) bond lengths are 1.98 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to two equivalent Zn(1), one Al(1), and one Al(2) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Zn(1), one Al(1), and two equivalent Al(2) atoms.