RbMgV4O10 crystallizes in the monoclinic Cm space group. Rb(1) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(9) atoms. Mg(1) is bonded to one O(3), one O(7), one O(8), and two equivalent O(10) atoms to form distorted corner-sharing MgO5 trigonal bipyramids. There are four inequivalent V sites. In the first V site, V(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the second V site, V(2) is bonded in a 5-coordinate geometry to one O(1), one O(4), one O(5), and two equivalent O(3) atoms. In the third V site, V(3) is bonded in a 5-coordinate geometry to one O(10), one O(6), one O(7), and two equivalent O(8) atoms. In the fourth V site, V(4) is bonded in a 5-coordinate geometry to one O(10), one O(8), one O(9), and two equivalent O(7) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one V(1) and one V(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Rb(1) and one V(1) atom. In the third O site, O(3) is bonded to one Mg(1), one V(1), and two equivalent V(2) atoms to form corner-sharing OMgV3 tetrahedra. In the fourth O site, O(4) is bonded in a T-shaped geometry to one V(2) and two equivalent V(1) atoms. In the fifth O site, O(5) is bonded in a single-bond geometry to two equivalent Rb(1) and one V(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one V(3) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Mg(1), one V(3), and two equivalent V(4) atoms. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Mg(1), one V(4), and two equivalent V(3) atoms. In the ninth O site, O(9) is bonded in a single-bond geometry to two equivalent Rb(1) and one V(4) atom. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to two equivalent Mg(1), one V(3), and one V(4) atom.
RbMgV4O10 crystallizes in the monoclinic Cm space group. Rb(1) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(9) atoms. Both Rb(1)-O(2) bond lengths are 3.02 Å. Both Rb(1)-O(5) bond lengths are 3.11 Å. Both Rb(1)-O(6) bond lengths are 2.99 Å. Both Rb(1)-O(9) bond lengths are 3.05 Å. Mg(1) is bonded to one O(3), one O(7), one O(8), and two equivalent O(10) atoms to form distorted corner-sharing MgO5 trigonal bipyramids. The Mg(1)-O(3) bond length is 2.06 Å. The Mg(1)-O(7) bond length is 2.23 Å. The Mg(1)-O(8) bond length is 2.12 Å. Both Mg(1)-O(10) bond lengths are 2.01 Å. There are four inequivalent V sites. In the first V site, V(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. The V(1)-O(1) bond length is 1.92 Å. The V(1)-O(2) bond length is 1.64 Å. The V(1)-O(3) bond length is 2.05 Å. Both V(1)-O(4) bond lengths are 2.02 Å. In the second V site, V(2) is bonded in a 5-coordinate geometry to one O(1), one O(4), one O(5), and two equivalent O(3) atoms. The V(2)-O(1) bond length is 1.77 Å. The V(2)-O(4) bond length is 1.95 Å. The V(2)-O(5) bond length is 1.63 Å. Both V(2)-O(3) bond lengths are 2.02 Å. In the third V site, V(3) is bonded in a 5-coordinate geometry to one O(10), one O(6), one O(7), and two equivalent O(8) atoms. The V(3)-O(10) bond length is 2.00 Å. The V(3)-O(6) bond length is 1.64 Å. The V(3)-O(7) bond length is 2.05 Å. Both V(3)-O(8) bond lengths are 2.00 Å. In the fourth V site, V(4) is bonded in a 5-coordinate geometry to one O(10), one O(8), one O(9), and two equivalent O(7) atoms. The V(4)-O(10) bond length is 1.99 Å. The V(4)-O(8) bond length is 2.05 Å. The V(4)-O(9) bond length is 1.64 Å. Both V(4)-O(7) bond lengths are 2.01 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one V(1) and one V(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Rb(1) and one V(1) atom. In the third O site, O(3) is bonded to one Mg(1), one V(1), and two equivalent V(2) atoms to form corner-sharing OMgV3 tetrahedra. In the fourth O site, O(4) is bonded in a T-shaped geometry to one V(2) and two equivalent V(1) atoms. In the fifth O site, O(5) is bonded in a single-bond geometry to two equivalent Rb(1) and one V(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one V(3) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Mg(1), one V(3), and two equivalent V(4) atoms. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Mg(1), one V(4), and two equivalent V(3) atoms. In the ninth O site, O(9) is bonded in a single-bond geometry to two equivalent Rb(1) and one V(4) atom. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to two equivalent Mg(1), one V(3), and one V(4) atom.