Rb6Fe2O5 crystallizes in the monoclinic Cm space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted edge-sharing RbO4 trigonal pyramids. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a trigonal planar geometry to one O(3) and two equivalent O(1) atoms. In the second Fe site, Fe(2) is bonded in a trigonal planar geometry to one O(3) and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), and one Fe(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), and one Fe(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(4), two equivalent Rb(2), one Fe(1), and one Fe(2) atom.
Rb6Fe2O5 crystallizes in the monoclinic Cm space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted edge-sharing RbO4 trigonal pyramids. There is one shorter (2.73 Å) and one longer (2.92 Å) Rb(1)-O(1) bond length. There is one shorter (2.78 Å) and one longer (2.88 Å) Rb(1)-O(2) bond length. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Rb(2)-O(3) bond length is 2.96 Å. There is one shorter (2.85 Å) and one longer (3.01 Å) Rb(2)-O(1) bond length. There is one shorter (2.91 Å) and one longer (3.02 Å) Rb(2)-O(2) bond length. In the third Rb site, Rb(3) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Rb(3)-O(1) bond lengths are 3.19 Å. Both Rb(3)-O(2) bond lengths are 2.94 Å. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Rb(4)-O(3) bond length is 2.82 Å. Both Rb(4)-O(1) bond lengths are 2.96 Å. Both Rb(4)-O(2) bond lengths are 3.17 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a trigonal planar geometry to one O(3) and two equivalent O(1) atoms. The Fe(1)-O(3) bond length is 1.90 Å. Both Fe(1)-O(1) bond lengths are 1.84 Å. In the second Fe site, Fe(2) is bonded in a trigonal planar geometry to one O(3) and two equivalent O(2) atoms. The Fe(2)-O(3) bond length is 1.91 Å. Both Fe(2)-O(2) bond lengths are 1.84 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), and one Fe(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Rb(3), one Rb(4), two equivalent Rb(1), two equivalent Rb(2), and one Fe(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(4), two equivalent Rb(2), one Fe(1), and one Fe(2) atom.