RbBaMnO4 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 10-coordinate geometry to one O(2), three equivalent O(3), and six equivalent O(1) atoms. Ba(1) is bonded in a 9-coordinate geometry to two equivalent O(3), three equivalent O(2), and four equivalent O(1) atoms. Mn(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1), two equivalent Ba(1), and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Ba(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Rb(1), two equivalent Ba(1), and one Mn(1) atom.
RbBaMnO4 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 10-coordinate geometry to one O(2), three equivalent O(3), and six equivalent O(1) atoms. The Rb(1)-O(2) bond length is 2.88 Å. There are two shorter (3.01 Å) and one longer (3.23 Å) Rb(1)-O(3) bond length. There are a spread of Rb(1)-O(1) bond distances ranging from 3.05-3.36 Å. Ba(1) is bonded in a 9-coordinate geometry to two equivalent O(3), three equivalent O(2), and four equivalent O(1) atoms. There is one shorter (2.78 Å) and one longer (2.95 Å) Ba(1)-O(3) bond length. There is one shorter (2.82 Å) and two longer (3.23 Å) Ba(1)-O(2) bond lengths. There are two shorter (2.76 Å) and two longer (2.82 Å) Ba(1)-O(1) bond lengths. Mn(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Mn(1)-O(2) bond length is 1.71 Å. The Mn(1)-O(3) bond length is 1.73 Å. Both Mn(1)-O(1) bond lengths are 1.72 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1), two equivalent Ba(1), and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Ba(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to three equivalent Rb(1), two equivalent Ba(1), and one Mn(1) atom.