RbLaNb2O7 crystallizes in the orthorhombic Imma space group. Rb(1) is bonded in a distorted body-centered cubic geometry to eight equivalent O(3) atoms. La(1) is bonded in a 11-coordinate geometry to three equivalent O(2), four equivalent O(1), and four equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(1) and two equivalent Nb(1) atoms to form a mixture of distorted corner and edge-sharing OLa2Nb2 tetrahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent La(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to four equivalent Rb(1) and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent La(1) and two equivalent Nb(1) atoms.
RbLaNb2O7 crystallizes in the orthorhombic Imma space group. Rb(1) is bonded in a distorted body-centered cubic geometry to eight equivalent O(3) atoms. There are a spread of Rb(1)-O(3) bond distances ranging from 2.94-3.43 Å. La(1) is bonded in a 11-coordinate geometry to three equivalent O(2), four equivalent O(1), and four equivalent O(4) atoms. There is one shorter (2.33 Å) and two longer (2.79 Å) La(1)-O(2) bond lengths. All La(1)-O(1) bond lengths are 2.63 Å. All La(1)-O(4) bond lengths are 2.86 Å. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. The Nb(1)-O(2) bond length is 2.35 Å. The Nb(1)-O(3) bond length is 1.80 Å. Both Nb(1)-O(1) bond lengths are 2.05 Å. Both Nb(1)-O(4) bond lengths are 2.00 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(1) and two equivalent Nb(1) atoms to form a mixture of distorted corner and edge-sharing OLa2Nb2 tetrahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent La(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to four equivalent Rb(1) and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent La(1) and two equivalent Nb(1) atoms.