Rb3LiTbV2O8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 1-coordinate geometry to one O(1) and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a linear geometry to two equivalent O(3) atoms. Li(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. Tb(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form TbO6 octahedra that share corners with six equivalent V(1)O4 tetrahedra. V(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form VO4 tetrahedra that share corners with three equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-35°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Rb(1) and one V(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(1), one Tb(1), and one V(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(2), two equivalent Rb(1), one Tb(1), and one V(1) atom.
Rb3LiTbV2O8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 1-coordinate geometry to one O(1) and two equivalent O(3) atoms. The Rb(1)-O(1) bond length is 2.69 Å. Both Rb(1)-O(3) bond lengths are 3.15 Å. In the second Rb site, Rb(2) is bonded in a linear geometry to two equivalent O(3) atoms. Both Rb(2)-O(3) bond lengths are 2.95 Å. Li(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. All Li(1)-O(2) bond lengths are 2.02 Å. Tb(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form TbO6 octahedra that share corners with six equivalent V(1)O4 tetrahedra. Both Tb(1)-O(3) bond lengths are 2.34 Å. All Tb(1)-O(2) bond lengths are 2.27 Å. V(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form VO4 tetrahedra that share corners with three equivalent Tb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 2-35°. The V(1)-O(1) bond length is 1.71 Å. The V(1)-O(3) bond length is 1.78 Å. Both V(1)-O(2) bond lengths are 1.82 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Rb(1) and one V(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(1), one Tb(1), and one V(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(2), two equivalent Rb(1), one Tb(1), and one V(1) atom.