Rb6Ti2O7 crystallizes in the trigonal P-3 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one O(1) and three equivalent O(2) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3) and three equivalent O(2) atoms to form corner-sharing TiO4 tetrahedra. In the second Ti site, Ti(2) is bonded to one O(3) and three equivalent O(1) atoms to form corner-sharing TiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Rb(2), three equivalent Rb(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Rb(2), and one Ti(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to three equivalent Rb(1), one Ti(1), and one Ti(2) atom.
Rb6Ti2O7 crystallizes in the trigonal P-3 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. The Rb(1)-O(2) bond length is 2.81 Å. The Rb(1)-O(3) bond length is 3.02 Å. There are a spread of Rb(1)-O(1) bond distances ranging from 2.81-3.14 Å. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one O(1) and three equivalent O(2) atoms. The Rb(2)-O(1) bond length is 2.78 Å. There are a spread of Rb(2)-O(2) bond distances ranging from 2.79-3.00 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3) and three equivalent O(2) atoms to form corner-sharing TiO4 tetrahedra. The Ti(1)-O(3) bond length is 1.92 Å. All Ti(1)-O(2) bond lengths are 1.82 Å. In the second Ti site, Ti(2) is bonded to one O(3) and three equivalent O(1) atoms to form corner-sharing TiO4 tetrahedra. The Ti(2)-O(3) bond length is 1.93 Å. All Ti(2)-O(1) bond lengths are 1.82 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Rb(2), three equivalent Rb(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Rb(2), and one Ti(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to three equivalent Rb(1), one Ti(1), and one Ti(2) atom.