Rb3FeO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded to one O(3) and three equivalent O(2) atoms to form a mixture of corner and edge-sharing RbO4 tetrahedra. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Fe(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Rb(1), two equivalent Rb(3), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ORb4Fe trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(3), three equivalent Rb(2), and one Fe(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(2), two equivalent Rb(1), two equivalent Rb(3), and one Fe(1) atom.
Rb3FeO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(3) atoms. There is one shorter (2.80 Å) and one longer (2.85 Å) Rb(1)-O(1) bond length. There is one shorter (2.94 Å) and one longer (2.96 Å) Rb(1)-O(3) bond length. In the second Rb site, Rb(2) is bonded to one O(3) and three equivalent O(2) atoms to form a mixture of corner and edge-sharing RbO4 tetrahedra. The Rb(2)-O(3) bond length is 2.83 Å. There are two shorter (2.81 Å) and one longer (2.92 Å) Rb(2)-O(2) bond length. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Rb(3)-O(2) bond length is 2.98 Å. There is one shorter (2.90 Å) and one longer (2.93 Å) Rb(3)-O(1) bond length. There is one shorter (2.93 Å) and one longer (3.27 Å) Rb(3)-O(3) bond length. Fe(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The Fe(1)-O(1) bond length is 1.82 Å. The Fe(1)-O(2) bond length is 1.85 Å. The Fe(1)-O(3) bond length is 1.85 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Rb(1), two equivalent Rb(3), and one Fe(1) atom to form a mixture of distorted corner and edge-sharing ORb4Fe trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(3), three equivalent Rb(2), and one Fe(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(2), two equivalent Rb(1), two equivalent Rb(3), and one Fe(1) atom.