Rb2O is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded to four equivalent O(1) atoms to form a mixture of edge and corner-sharing RbO4 tetrahedra. O(1) is bonded in a 7-coordinate geometry to three equivalent Rb(1) and four equivalent Rb(2) atoms.
Rb2O is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(1) atoms. There is one shorter (2.74 Å) and two longer (2.97 Å) Rb(1)-O(1) bond lengths. In the second Rb site, Rb(2) is bonded to four equivalent O(1) atoms to form a mixture of edge and corner-sharing RbO4 tetrahedra. There are a spread of Rb(2)-O(1) bond distances ranging from 2.82-2.93 Å. O(1) is bonded in a 7-coordinate geometry to three equivalent Rb(1) and four equivalent Rb(2) atoms.