Ba(MnO4)2 crystallizes in the orthorhombic Fddd space group. Ba(1) is bonded in a 12-coordinate geometry to four equivalent O(2) and eight equivalent O(1) atoms. Mn(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded in a single-bond geometry to one Ba(1) and one Mn(1) atom. In the second O site, O(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one Mn(1) atom.
Ba(MnO4)2 crystallizes in the orthorhombic Fddd space group. Ba(1) is bonded in a 12-coordinate geometry to four equivalent O(2) and eight equivalent O(1) atoms. All Ba(1)-O(2) bond lengths are 2.85 Å. There are four shorter (3.00 Å) and four longer (3.12 Å) Ba(1)-O(1) bond lengths. Mn(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Mn(1)-O(1) bond lengths are 1.63 Å. Both Mn(1)-O(2) bond lengths are 1.61 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a single-bond geometry to one Ba(1) and one Mn(1) atom. In the second O site, O(1) is bonded in a single-bond geometry to two equivalent Ba(1) and one Mn(1) atom.